What Does “Medically Necessary” Mean?

When your insurance company says a treatment is not medically necessary, it is generally saying that the requested care does not satisfy the plan’s coverage criteria for your particular situation.

That does not necessarily mean your doctor believes the treatment is unnecessary.

The insurer may believe:

• You have not tried enough alternative treatments.
• You need additional diagnostic evidence.
• A less expensive treatment should be tried first.
• Your medical records do not demonstrate the required symptoms.
• You have not satisfied step-therapy requirements.
• Your requested level of care is more intensive than the plan believes you need.
• The treatment is considered experimental or investigational.
• The provider or facility is outside the plan’s network.
• Prior authorization requirements were not satisfied.

Your appeal should therefore answer the insurer’s specific objection instead of simply repeating that your doctor recommends the treatment.

Why Your [Health Insurance Appeal Letter] Must Address the Exact Denial

One of the biggest mistakes you can make is sending a generic letter.

Suppose your denial says you must complete six weeks of physical therapy before an MRI can be approved.

Writing:

“My doctor says I need an MRI.”

does not directly answer the insurer’s concern.

You will have a stronger argument if you explain:

“I completed eight weeks of physical therapy from [date] through [date]. My symptoms continued despite treatment, including persistent lower-back pain and numbness extending into my left leg. My physician is requesting an MRI to evaluate possible nerve compression and determine the appropriate next treatment.”

Now you have answered the actual denial reason.

That is the approach you should use throughout your appeal.

What You Should Include in a Medical Necessity Appeal Letter

Your letter should make the case easy for the reviewer to follow.

1. Your identifying information

Include:

• Your full name
• Address
• Telephone number
• Email address
• Member or policy number
• Group number, if applicable
• Claim number
• Patient date of birth when appropriate

2. A clear subject line

Use a subject such as:

Subject: Appeal of Medical Necessity Denial for [Treatment or Service]

3. The denial information

State:

• What was denied
• When it was denied
• Why the insurer says it was denied

4. Your medical condition

Explain your diagnosis, symptoms, severity, and how the condition affects your normal activities.

5. What you have already tried

List previous:

• Medications
• Physical therapy
• Procedures
• Injections
• Counseling
• Home treatment
• Surgery
• Lifestyle changes
• Lower levels of care

Be specific about why each alternative failed.

6. Your provider’s recommendation

Explain why your doctor, specialist, therapist, or other treating provider believes the requested treatment is necessary.

7. Supporting evidence

You might include:

• Physician notes
• Specialist reports
• Imaging
• Laboratory results
• Therapy notes
• Hospital records
• Medication history
• Prior authorization documentation
• Clinical guidelines when appropriate

If you need documentation from your provider, use [Medical Records Request Letter] or review [15 Medical Records Request Letter Samples].

8. The action you want

Do not make the reviewer guess.

Clearly state that you want the denial reconsidered and reversed.

Before You Write Your Medical Necessity Appeal

Gather your evidence before you start drafting.

You should ideally have:

• Your original denial notice
• Your Explanation of Benefits, if applicable
• Your insurance member information
• Your claim or authorization number
• Your doctor’s medical necessity statement
• Relevant medical records
• Diagnostic test results
• Documentation of prior treatments
• Medication history
• Specialist recommendations
• Therapy progress notes
• Previous authorization requests
• Supporting clinical information when appropriate

Your letter becomes much easier to write once these materials are in front of you.

If records are missing, start with [How to Write a Medical Records Request Letter] before finishing your appeal packet.

Do Not Miss Your Medical Appeal Deadline

Read your denial notice immediately.

For health plans subject to the federal internal-appeal protections described by HealthCare.gov, an internal appeal generally must be filed within 180 days after you receive notice of the denial. Your actual notice and plan documents should control what you do, because different coverage arrangements and government programs can follow different procedures.

If your internal appeal remains denied and your situation qualifies for external review, HealthCare.gov states that standard external reviews are generally decided no later than 45 days after the request is received. Expedited external reviews are generally decided as quickly as medically necessary and no later than 72 hours.

If waiting could seriously jeopardize your health or your ability to regain maximum function, ask your insurer and your healthcare provider whether an expedited appeal is appropriate.

If your coverage is through Medicare, do not automatically use the private-plan deadlines above. Medicare has different appeal procedures depending on whether you have Original Medicare, a Medicare Advantage plan, or prescription drug coverage. Medicare generally provides multiple levels of appeal and gives you instructions in the decision notice you receive.

You can also review [How to Write a Letter to Medicare] for additional wording and organization ideas.

17 Medical Necessity Appeal Letter Samples

Use the sample that most closely matches your denial. Replace every bracketed field with your own information and adjust the medical explanation to match the documentation supplied by your provider.

1. Medical Necessity Appeal Letter for a Denied MRI

[Your Name]
[Your Address]
[City, State ZIP]
[Phone Number]
[Email Address]

[Date]

Appeals Department
[Insurance Company Name]
[Address]

Subject: Appeal of Medical Necessity Denial for MRI

Dear Appeals Reviewer,

I am writing to appeal the denial dated [denial date] for an MRI of my [body part]. The denial notice states that the requested MRI does not meet the plan’s medical necessity requirements.

I have been diagnosed with [diagnosis or suspected condition] and continue to experience [describe symptoms]. These symptoms have continued despite [physical therapy, medication, injections, activity modification, or other treatments].

My treating physician, Dr. [Name], has determined that an MRI is now necessary to evaluate [suspected problem] and determine the appropriate next stage of treatment.

I have already completed [describe prior treatment], but my symptoms have not improved sufficiently. My physician believes additional imaging is necessary because [specific medical reason].

I am enclosing my physician’s supporting statement, relevant office notes, previous treatment records, and any available diagnostic reports.

Please reconsider the information provided and reverse the denial for the requested MRI.

I respectfully request written confirmation of your decision.

Sincerely,

[Your Name]

2. Medical Necessity Appeal Letter for Prior Authorization Denial

Subject: Appeal of Prior Authorization Denial for [Treatment]

Dear Appeals Department,

I am appealing the denial of prior authorization for [treatment, procedure, service, or medication] contained in your notice dated [date].

The denial states that the requested treatment does not meet the plan’s medical necessity requirements.

I have been diagnosed with [condition]. My treating provider, [provider name], recommended [treatment] because I continue to experience [symptoms or limitations] despite completing [previous treatments].

I have previously tried [treatment 1], [treatment 2], and [treatment 3]. These treatments were unsuccessful because [brief explanation].

My provider believes the requested treatment is now the appropriate medical option because [specific medical explanation].

Attached are my provider’s medical necessity statement, clinical records, treatment history, and other supporting documentation.

I respectfully request a complete reconsideration of this prior authorization decision and approval of [treatment].

Please provide your decision in writing.

Sincerely,

[Your Name]

3. Medical Necessity Appeal Letter for Denied Prescription Medication

If your primary issue is medication coverage, you can also review [Medical Appeal Letter for Medication Denial].

Subject: Appeal of Coverage Denial for [Medication Name]

Dear Appeals Reviewer,

I am writing to appeal the denial of coverage for [medication name] dated [date].

I have been diagnosed with [condition], and my physician prescribed [medication] because it is medically appropriate for my current condition and treatment history.

Before this medication was prescribed, I tried [medication or treatment], but it [did not adequately control my condition/caused side effects/was contraindicated].

I also tried [additional treatment], which resulted in [outcome].

My physician has determined that [requested medication] is medically necessary because [specific reason]. The alternative medication suggested by the plan is not appropriate for me because [medical reason].

I have attached my physician’s supporting statement, medication history, office notes, and documentation showing my response to previous treatments.

Please reverse the denial and approve coverage for [medication].

Thank you for reviewing the medical evidence supporting this appeal.

Sincerely,

[Your Name]

4. Medical Necessity Appeal Letter for Out-of-Network Specialist Care

Subject: Appeal for Medically Necessary Out-of-Network Specialist Care

Dear Appeals Department,

I am appealing your denial of coverage for treatment with [specialist name] dated [date].

I have been diagnosed with [condition], which requires specialized evaluation and treatment.

My treating physicians have recommended [specialist name] because [describe specialized qualifications or treatment need]. I have been unable to locate an appropriate in-network provider who can provide the medically necessary care I require within a reasonable time and distance.

I contacted [names or number of in-network providers, if applicable], but [explain lack of availability, expertise, appointment access, or appropriate services].

My physicians believe that delaying specialized care may result in [medical risk or deterioration].

I have attached referrals, physician statements, records of my attempts to obtain appropriate in-network care, and relevant medical documentation.

I respectfully request authorization for treatment with [specialist] and coverage at the appropriate benefit level.

Please reconsider this decision based on the medical and access information provided.

Sincerely,

[Your Name]

5. Medical Necessity Appeal Letter for Additional Physical Therapy

Subject: Appeal of Denial for Additional Physical Therapy Visits

Dear Appeals Reviewer,

I am writing to appeal the denial of additional physical therapy visits for treatment of [condition or injury].

I have completed [number] physical therapy sessions and have made measurable progress. However, I continue to experience limitations involving [walking, strength, range of motion, balance, pain, lifting, or other functions].

My physician and physical therapist recommend an additional [number] visits because I have not yet reached a safe and functional level of recovery.

My recent therapy records show improvement in [specific measurement or activity], but I continue to have difficulty with [specific limitation].

Ending treatment now may interrupt my recovery and increase the likelihood of regression or additional medical intervention.

I have attached my physician’s recommendation and current physical therapy progress notes.

Please reconsider the denial and authorize the additional physical therapy sessions recommended by my treatment team.

Sincerely,

[Your Name]

6. Medical Necessity Appeal Letter for Inpatient Rehabilitation

Subject: Appeal of Denial for Inpatient Rehabilitation

Dear Appeals Department,

I am writing to appeal the denial of inpatient rehabilitation coverage for [patient name].

Following [stroke, surgery, accident, hospitalization, or illness], I continue to experience [mobility problems, neurological deficits, swallowing problems, weakness, balance problems, or other limitations].

My treatment team has determined that I require coordinated rehabilitation and medical supervision at the inpatient level.

A lower level of care would not safely meet my current needs because [explain why outpatient care, home treatment, or another setting is insufficient].

I currently require assistance with [walking, transferring, dressing, medication management, eating, communication, or other activities].

My treatment team believes inpatient rehabilitation provides the level of coordinated care necessary to improve my function and reduce the risk of complications.

Attached are physician recommendations, therapy evaluations, hospital records, and other supporting documentation.

Please overturn the denial and authorize the requested inpatient rehabilitation.

Sincerely,

[Your Name]

7. Medical Necessity Appeal Letter for Home Health Services

Subject: Appeal of Denial for Medically Necessary Home Health Services

Dear Appeals Department,

I am appealing the denial of home health services contained in your notice dated [date].

I have [diagnosis or condition], which substantially limits my ability to leave home safely without assistance.

My physician ordered home health services because I currently require skilled care including [wound care, nursing assessments, physical therapy, medication monitoring, occupational therapy, or other service].

Receiving these services at home is medically necessary because [explain mobility problem, safety issue, infection risk, weakness, or other limitation].

Attempting to obtain these services in an outpatient setting would be difficult or unsafe because [specific reason].

I have enclosed my physician’s order, recent clinical notes, and documentation from the home health provider.

Please reconsider the denial and approve the ordered home health services.

Sincerely,

[Your Name]

8. Medical Necessity Appeal Letter for CPAP or Durable Medical Equipment

Subject: Appeal of Denial for [CPAP/Wheelchair/Hospital Bed/DME]

Dear Appeals Reviewer,

I am appealing the denial of coverage for [equipment] dated [date].

My physician prescribed this equipment to treat or manage [condition].

Without this equipment, I have significant difficulty with [breathing, sleeping, mobility, positioning, transfers, pressure relief, safety, or another function].

My physician has determined that the requested equipment is medically necessary because [specific explanation].

Alternative equipment or less intensive measures are not appropriate because [reason].

I have attached my prescription, physician documentation, diagnostic records, and other information supporting the medical necessity of this equipment.

Please reconsider the denial and authorize coverage for [equipment].

Sincerely,

[Your Name]

9. Medical Necessity Appeal Letter for Mental Health Treatment

Subject: Appeal of Medical Necessity Denial for Mental Health Treatment

Dear Appeals Department,

I am appealing the denial of coverage for [therapy, intensive outpatient treatment, partial hospitalization, residential treatment, or other service].

I am currently receiving treatment for [diagnosis]. My treating provider recommends the requested level of care because I continue to experience [symptoms and functional problems].

I previously received or attempted [lower level of care or previous treatments], but these services were not sufficient because [explanation].

My provider believes that the requested treatment is necessary to stabilize my condition and address my current clinical needs.

I have attached my provider’s recommendation, treatment history, current assessment, and other relevant records.

Please conduct a full review of the clinical documentation and reverse the denial for the requested treatment.

Sincerely,

[Your Name]

10. Medical Necessity Appeal Letter for Pediatric Therapy

Subject: Appeal of Denial for [Speech/Occupational/Physical] Therapy

Dear Appeals Reviewer,

I am appealing the denial of [therapy type] for my child, [child’s name].

My child has been diagnosed with [diagnosis or condition], which affects [communication, feeding, mobility, fine motor skills, sensory regulation, coordination, or other functional area].

The recommended therapy is intended to address specific functional deficits documented by my child’s physician and therapist.

Although my child has made progress, significant limitations remain in [specific areas].

My child’s treatment providers believe continued therapy is medically necessary because [specific clinical reason].

Stopping therapy at this point could interrupt progress toward the functional goals identified in the treatment plan.

I have enclosed physician documentation, therapy evaluations, progress notes, and the current treatment plan.

Please reconsider the denial and approve the requested therapy.

Sincerely,

[Parent or Guardian Name]

11. Medical Necessity Appeal Letter for Cancer Treatment

Subject: Urgent Medical Necessity Appeal for Cancer Treatment

Dear Appeals Department,

I am appealing the denial dated [date] for [chemotherapy, radiation therapy, targeted therapy, imaging, medication, or other cancer treatment].

I am currently being treated for [cancer diagnosis].

My oncologist, Dr. [Name], has recommended [treatment] based on my diagnosis, disease stage, treatment history, test results, and current medical condition.

The requested treatment is part of my oncologist’s recommended treatment plan.

Delaying treatment may adversely affect my ability to receive timely cancer care.

I have enclosed my oncologist’s medical necessity letter, pathology records, imaging results, treatment history, and other supporting documentation.

Because treatment timing is medically important in my case, I am also requesting expedited consideration if my appeal qualifies for expedited review.

Please reconsider the denial and authorize the requested treatment as quickly as possible.

Sincerely,

[Your Name]

12. Medical Necessity Appeal Letter for Surgery

Subject: Appeal of Medical Necessity Denial for [Surgery Name]

Dear Appeals Reviewer,

I am writing to appeal the denial of [surgery] dated [date].

My surgeon has recommended this procedure to treat [diagnosis].

Before surgery was recommended, I completed conservative treatment including [medications, physical therapy, injections, activity modification, bracing, or other treatment].

Despite these efforts, I continue to experience [pain, weakness, mobility problems, neurological symptoms, recurrent complications, or other limitations].

My condition affects my ability to [work, walk, sleep, exercise, perform daily activities, or care for myself].

My surgeon has determined that surgery is now medically appropriate because [reason].

Attached are my surgeon’s supporting statement, imaging results, treatment history, examination findings, and other relevant medical records.

Please reconsider the denial and approve the recommended surgery.

Sincerely,

[Your Name]

13. Medical Necessity Appeal Letter for Infusion Therapy

Subject: Appeal of Denial for Medically Necessary Infusion Therapy

Dear Appeals Department,

I am appealing the denial of [infusion medication or treatment] dated [date].

I have been diagnosed with [condition], and my specialist recommends infusion therapy because previous treatments have not adequately controlled my condition.

I have previously tried [medications or treatments]. These options were unsuccessful because [lack of effectiveness, intolerance, side effects, or other reason].

My physician believes [infusion treatment] is medically necessary to manage my disease and reduce the risk of further complications.

I have attached my specialist’s medical necessity statement, medication history, laboratory results, office notes, and other supporting documentation.

Please reconsider your decision and authorize the recommended infusion therapy.

Sincerely,

[Your Name]

14. Medical Necessity Appeal Letter for Skilled Nursing Facility Care

Subject: Appeal of Denial for Skilled Nursing Facility Coverage

Dear Appeals Reviewer,

I am appealing the denial of skilled nursing facility coverage dated [date].

Following [hospitalization, surgery, injury, or illness], I continue to require skilled nursing and rehabilitation services.

My current medical and functional needs include [wound care, medication management, therapy, mobility assistance, monitoring, or another skilled service].

My treatment team believes discharge to a lower level of care is not presently appropriate because [medical or safety reason].

I continue to require professional services that cannot be safely or effectively provided in my current home environment.

Attached are physician recommendations, hospital discharge documentation, nursing assessments, therapy records, and other relevant medical information.

Please reconsider the denial and authorize the recommended skilled nursing facility care.

Sincerely,

[Your Name]

15. Medical Necessity Appeal Letter for Continuation of Care

Subject: Appeal of Denial for Continuation of Medically Necessary Care

Dear Appeals Department,

I am appealing the denial of continued coverage for [treatment, provider, medication, or service] dated [date].

I am currently undergoing treatment for [condition], and my provider believes interruption of this care could negatively affect my progress.

The current treatment has resulted in [describe measurable benefit, stabilization, symptom improvement, or functional improvement].

My provider recommends continuing treatment for [length of time or number of visits] because [medical reason].

Changing or discontinuing treatment at this stage may result in [relapse, deterioration, worsening symptoms, loss of function, or other medical concern].

I have attached my treatment records and my provider’s statement supporting continuation of care.

Please reverse the denial and approve continued coverage for the recommended treatment.

Sincerely,

[Your Name]

16. Appeal Letter When Treatment Is Called Experimental or Investigational

Subject: Appeal of Experimental or Investigational Treatment Denial

Dear Appeals Reviewer,

I am appealing the denial of coverage for [treatment] contained in your letter dated [date].

Your decision states that the requested treatment is considered experimental or investigational.

My physician recommends this treatment because standard treatment options have [failed, produced unacceptable side effects, been exhausted, or been determined inappropriate].

My physician believes that [treatment] is appropriate for my particular medical condition because [specific explanation].

I have included my physician’s detailed medical necessity statement, complete treatment history, and supporting clinical information relevant to my situation.

I respectfully request that you review this case based on my individual medical circumstances and the supporting evidence provided.

Please reconsider the denial and approve the requested treatment.

Sincerely,

[Your Name]

17. Expedited Medical Necessity Appeal Letter for Urgent Care

Subject: Request for Expedited Medical Necessity Appeal

Dear Appeals Department,

I am requesting an expedited appeal of the denial dated [date] for [treatment, medication, procedure, or service].

My treating physician has determined that delaying this treatment while waiting for the standard appeal process could seriously affect my health or my ability to recover.

I have [diagnosis], and I am currently experiencing [symptoms or deterioration].

The requested treatment is needed now because [specific urgent medical reason].

My physician has included a supporting statement explaining why delayed treatment may result in [medical consequence].

I have also attached the original denial notice and relevant medical records.

Because of the urgency of my medical condition, I respectfully request expedited review and prompt written notification of the decision.

Sincerely,

[Your Name]

How to Make Your Medical Necessity Appeal More Persuasive

Your appeal should tell a simple story that the reviewer can understand quickly:

You have a documented medical condition.

Then:

You tried the appropriate earlier treatments.

Then:

Those treatments did not solve the problem or were unsuitable.

Finally:

Your provider is recommending a specific treatment for a documented medical reason.

That sequence is usually much stronger than filling your letter with emotional complaints.

For additional insurance appeal examples, review [15 Appeal Letters for Reconsideration of Insurance Claims].

Weak Versus Strong Medical Necessity Wording

Weak

“My doctor says I need this treatment. Please cover it.”

Stronger

“I completed eight weeks of physical therapy and two prescribed medications without sufficient improvement. I continue to experience weakness, pain, and numbness that interfere with walking and sleeping. My physician is requesting additional diagnostic testing to determine whether nerve compression is contributing to my symptoms and to guide the next stage of treatment.”

Notice the difference.

The stronger version gives the reviewer:

• Your symptoms
• Your treatment history
• Your lack of improvement
• Your current functional problems
• Your doctor’s reason for requesting additional care

You should try to provide that level of specificity in your own appeal.

Best Phrases to Use in a [Medication Appeal Letter] or Medical Necessity Appeal

You can adapt these phrases:

• “I am appealing the denial dated [date] for [treatment or service].”
• “The denial states that the requested treatment does not meet the plan’s medical necessity requirements.”
• “My treating physician recommends this treatment based on my diagnosis, symptoms, and treatment history.”
• “I have already completed the following conservative treatments.”
• “These treatments did not adequately improve my condition.”
• “The alternative suggested by the plan is not clinically appropriate for me because…”
• “My current symptoms substantially affect my ability to…”
• “My physician has explained the medical risk associated with delaying treatment.”
• “I have attached supporting medical records and my provider’s medical necessity statement.”
• “I respectfully request a full reconsideration and reversal of this denial.”
• “Please provide your decision in writing.”

Phrases You Should Avoid

Avoid turning your medical appeal into an angry complaint.

Statements such as these usually do not strengthen the medical argument:

• “This denial is ridiculous.”
• “Your company obviously does not care about patients.”
• “You are deliberately refusing to help me.”
• “My doctor said you have to cover this.”
• “I will sue if you do not approve this immediately.”

You can be firm without becoming hostile.

Your strongest argument is usually your documentation.

Your Medical Necessity Evidence Checklist

Before sending your appeal, confirm that you have included everything relevant.

Denial documents

• Denial notice
• Explanation of Benefits
• Claim number
• Prior authorization number
• Appeal instructions
• Filing deadline

Medical evidence

• Physician letter
• Office notes
• Specialist records
• Laboratory results
• Imaging
• Therapy records
• Medication history
• Hospital records
• Treatment timeline

Previous treatment evidence

Document:

• What you tried
• When you tried it
• How long you tried it
• Whether it helped
• Why you stopped
• Side effects you experienced

Final appeal documents

Include:

• Your appeal letter
• Provider medical necessity letter
• Supporting medical records
• Copy of the denial notice
• Any required appeal form

If you are missing records, use [Medical Records Request Letter] before submitting an incomplete packet.

Should Your Doctor Write a Separate Medical Necessity Letter?

Usually, you should ask your treating provider to submit a separate supporting statement when the insurer is questioning medical necessity.

Your provider can address medical issues that you may not be able to explain as precisely yourself.

Ask the provider to include:

• Your diagnosis
• Your relevant symptoms
• The severity of your condition
• Your treatment history
• Previously failed treatments
• Test results
• The treatment being requested
• Why the treatment is appropriate now
• Why the insurer’s proposed alternatives may be inappropriate
• What could happen if treatment is delayed

Your appeal letter and your provider’s letter should support each other rather than repeat the exact same information.

What Should You Do If Your First Appeal Is Denied?

Do not automatically assume the process is finished.

Read the new denial carefully.

Determine:

1. Why the appeal was denied.
2. Whether another internal review is available.
3. Whether you qualify for external review.
4. Whether additional medical evidence could address the new denial reason.
5. Whether your provider can speak directly with the insurer’s medical reviewer.
6. Whether an expedited review is appropriate.

HealthCare.gov explains that qualifying health-plan decisions can move from an internal appeal to an independent external review, meaning the insurer does not necessarily have the final decision in every eligible case.

You can use [Appeal Letter for Reconsideration] when you need to present new evidence or ask for another review.