Off-label or experimental use letter (for your clinician)
A letter in your clinician's voice that responds to an experimental, investigational or off-label denial with the clinical reasons and the evidence for this patient. Every clinical statement is a blank for the clinician to complete.
- Private: nothing leaves this tab
- A template, not legal advice
This one is for a specific kind of coverage
It is written for the coverage tagged above. If you have a different kind (for example Medicare or Medicaid instead of a job-based or individual plan), it may cite the wrong rules. Check what kind of coverage you have and use the letter written for it.
When to use this, and what it is not
When to use this. How to hand this to the office: print it or save it with the blanks showing, clip your denial letter to it, and ask the clinician to fill in every clinical blank from your chart, edit it in their own words, and sign it. You fill in only the plan details. The wording is a starting point for the clinician, who decides what is accurate for you. Use it when the plan says a treatment is experimental or investigational, or not approved for your condition. The evidence has to come from your clinician; do not fill it in yourself.
This is a template, not legal advice. Read it, change anything that is not true for you, and send it only when you are satisfied. Your notice and your plan document control.
Fill in the letter
Your letter
[Your name] [Your address]
13 November 2026
[Name and address of the plan's medical reviewer]
Re: Off-label or experimental use letter (for your clinician) Plan: [Name of the health plan] Member ID: [Member ID] Claim or reference number: [Claim or reference number]
To the reviewer:
I am [The clinician's name], [The clinician's credentials]. I treat [The patient's full name] (member ID [Member ID]) as a specialist in [The clinician's specialty]. I am writing in support of the appeal of [Name of the health plan]'s decision of [Date on the denial notice], claim or reference [Claim or reference number], to deny [The care or drug that was denied] as experimental, investigational or not approved for this use.
Diagnosis: [Diagnosis]
Approval or regulatory status of the treatment for this use: [Approval or regulatory status of the treatment for this use, as the clinician knows it]
Standard treatments tried or ruled out, and why they are not suitable: [Standard treatments tried or ruled out, and why]
Expected benefit for this patient: [The expected benefit for this patient]
Evidence supporting this use: [Evidence for this use]
What I expect to happen without the treatment: [What is likely to happen without the treatment]
I ask the plan to overturn the denial. If the plan maintains that the treatment is experimental or investigational, I ask for the scientific or clinical explanation for that decision, applying the terms of the plan to this patient's medical circumstances, and for the name of the rule, guideline or evidence relied on. Because this is a medical judgment, I ask that the review be done by a health care professional with training and experience in [The clinician's specialty] who was not involved in the first decision.
I am available to speak with the reviewing physician at [A phone number where the reviewer can reach the clinician].
Enclosures: 1. Copy of the denial letter 2. Chart notes and test results 3. Copies of the studies or guidelines cited
Sincerely, [Your name]
Before you send it
The clinician's office can fax or upload it to the plan, or give it to you to include with your appeal. Use the appeals address or fax number on the denial notice; do not guess one. To prove it arrived, use certified mail with a return receipt, a fax confirmation page, or a portal screenshot that shows the date, and keep a copy.
What to enclose
- Copy of the denial letter
- Chart notes and test results
- Copies of the studies or guidelines cited
What happens next
- You: give the letter and the denial notice to your clinician's office. Ask when it will be ready and write the date down.
- Your clinician: completes every blank from the chart and the literature, signs the letter and sends it to you or to the plan.
- You: enclose it with your appeal. For most job-based and individual plans you have at least 180 days after you receive the denial notice to appeal, and your plan may allow more. A grandfathered individual policy may give less. Check the date on your notice, which controls.
- You: if the plan upholds the denial, ask about independent external review. A denial that turns on whether a treatment is experimental or investigational is a medical judgment that can go to federal external review. For most job-based and individual plans you must be allowed at least four months after you receive the final denial to ask; check your notice, which controls.
The rule behind this
Sources
Denial reasons this answers
- Denial reason
Experimental or investigational
The plan says the treatment is unproven or still being tested. That is a medical question, so the appeal rests on evidence. Independent external review is open if your plan is not grandfathered, short-term, fixed indemnity or a sharing ministry.