Medicare Part D Formulary Exception: Appeal Coverage Denial Mid-Year

A medicare part d formulary exception is a formal request asking a plan to cover a non-formulary drug or reduce the copay for a drug on a higher tier. When a Medicare Part D plan drops a drug from its formulary mid-year, you can file this exception request to get coverage reinstated.

Why Part D Formularies Change Mid-Year and How to Anticipate Client Disruptions

A Medicare Part D formulary exception is a formal request asking a plan to cover a non-formulary drug or reduce the copay for a drug on a higher tier. When a Medicare Part D plan drops a drug from its formulary mid-year, you can file this exception request to get coverage reinstated.

Part D plans can update their formularies mid-year for several reasons. A drug manufacturer may discontinue a product, a new generic may enter the market, or the Food and Drug Administration (FDA) may issue new safety guidance. In 2025, many plans shifted to higher coinsurance structures and increased utilization management as a result of Inflation Reduction Act benefit changes.¹ These shifts can remove a drug from the formulary entirely or move it to a higher tier, increasing the client's out-of-pocket cost.

Advisors can anticipate disruptions by monitoring plan formulary updates quarterly. The Centers for Medicare & Medicaid Services (CMS) requires plans to post formulary changes on their websites. Set a recurring calendar reminder to check each client's plan formulary in January, April, July, and October. When a change is identified, the advisor can prepare a formulary exception request before the client runs out of their current supply.

A second early warning sign is the plan's annual notice of change (ANOC), which clients receive each fall. While the ANOC covers the next plan year, it often signals the plan's broader formulary strategy. If a drug was removed from the preferred tier for the upcoming year, the plan may also restrict it mid-year under a utilization management update.

Step-by-Step Formulary Exception Request Process for Advisors

The formulary exception process begins with a coverage determination request. The client or their prescriber must submit a written request to the plan stating that the preferred drug is medically inappropriate for the client. The request must include a supporting statement from the prescriber explaining why the non-formulary drug is necessary.²

The standard timeline for a coverage determination is 72 hours. For expedited requests involving a risk to the client's health, the plan must respond within 24 hours.³ The advisor should confirm the request was received by calling the plan's provider services line and obtaining a reference number.

If the plan approves the exception, coverage begins immediately. If the plan denies the request, the denial letter must include the specific reason and instructions for filing an appeal. The advisor should document the denial date, as the client has 60 days from that date to request a formal appeal.⁴

Coverage Determination vs. Tier Exception Knowing Which Path to File

A coverage determination and a tier exception are two distinct paths under Part D. A coverage determination applies when a drug is not on the formulary at all. The request asks the plan to add the drug as a non-formulary exception. A tier exception applies when a drug is on the formulary but on a higher tier than medically appropriate. The request asks the plan to apply the copay from a lower tier.

The prescriber's statement differs for each path. For a coverage determination, the prescriber must state that all preferred formulary alternatives are ineffective or contraindicated. For a tier exception, the prescriber must state that the higher-tier drug is medically necessary and that the lower-tier alternatives would not be as effective.

Advisors should file the correct path on the first attempt. Filing the wrong type of request resets the timeline and delays the client's access to medication. If the client needs a non-formulary drug, file a coverage determination. If the client needs a lower copay on a formulary drug, file a tier exception.

Managing the 72-Hour Decision Window What to Do When Plans Delay

The 72-hour decision window begins when the plan receives a complete coverage determination request. If the plan claims the request is incomplete, the advisor should ask for the specific missing information in writing. A common delay tactic is requesting additional clinical documentation that was already included in the prescriber's statement.

If the plan misses the 72-hour deadline, the client may treat the request as denied and proceed to the appeal stage. The advisor should document the date the request was submitted and the date the deadline passed. This documentation is critical for the appeal.

For expedited requests, the plan has 24 hours to respond. If the plan denies the expedited status, the request automatically reverts to the standard 72-hour timeline. The advisor should request the denial of expedited status in writing, as this can be challenged in the appeal.

Appealing an Unfavorable Decision to the Independent Review Entity

If the plan denies the coverage determination, the client has 60 days to request a formal appeal. The plan must respond to the appeal within 7 days. If the plan issues an unfavorable decision, it must forward the case to the Independent Review Entity (IRE).⁴

The IRE is a third-party organization contracted by CMS to review Part D appeals. The IRE must reverse or uphold the plan decision within 7 days for standard appeals or 72 hours for expedited appeals.⁵ The IRE decision is binding on the plan but not on the client — the client may continue to higher levels of appeal if the IRE upholds the denial.

The advisor should prepare the appeal packet with the original coverage determination request, the prescriber's statement, the plan's denial letter, and a timeline of events. Include a cover letter summarizing why the plan's decision was incorrect. The IRE reviews the case de novo, meaning it considers all evidence without deference to the plan's decision.

Template Letter and Documentation Checklist for Expedited Requests

An expedited request requires a prescriber statement that the standard timeline could seriously jeopardize the client's life or health. The following template can be adapted for each client.

Template: Expedited Coverage Determination Request

Date: June 27, 2026 Plan Name: SilverScript Plus Member ID: MDP7X4Y2M001 Prescriber: Dr. Marcus Thompson, NPI 4567891230

This is a request for an expedited coverage determination for Farxiga. The standard 72-hour timeline would seriously jeopardize the health of the patient because the patient's kidney function is incompatible with all formulary alternatives, and discontinuation would risk acute diabetic ketoacidosis. Attached is the prescriber's supporting statement.

Documentation Checklist

• Completed coverage determination request form
• Prescriber's supporting statement with medical rationale
• Clinical notes or lab results supporting the request
• List of failed formulary alternatives with dates
• Proof of prior authorization or step therapy attempts
• Plan's denial letter (if applicable)

Tracking and Managing Multiple Client Appeals Across Your Practice

Advisors managing multiple clients need a systematic tracking method. A spreadsheet with the following columns allows for quick status checks: client name, drug name, request type (coverage determination or tier exception), submission date, decision deadline, plan decision, appeal deadline, IRE decision.

Set automated reminders for each deadline. When a plan misses a deadline, the advisor should escalate immediately rather than waiting for the plan to respond. The 60-day appeal window is firm — missing it requires the client to start the process over with a new request.

For clients with multiple drugs affected by a formulary change, file separate requests for each drug. A single request covering multiple drugs may be rejected as incomplete. Each drug requires its own prescriber statement and clinical rationale.

Your Next Step

Download the CMS Part D appeals summary from the Medicare website and review the coverage determination and exception request sections. Then, identify one client currently taking a drug that was recently moved to a higher tier or removed from their plan's formulary. Prepare a draft coverage determination request with the prescriber's supporting statement using the template above. File the request and track the 72-hour decision window. This single action builds the workflow that can be replicated across your entire book of business.

For additional guidance on navigating Medicare coverage issues, Smart Money After 60 provides resources tailored to financial advisors working with retirement-age clients.