Getting a health insurance denial is disorienting. The language is technical, the implications are serious, and it's not obvious what to do next. The most important thing to understand: a denial is not final. It is the beginning of a process, not the end of one. Here are the seven steps to take in the first 48 hours after receiving a denial.
Don't do this first
Do not call your insurer to complain, argue, or ask for an explanation before you've read the denial letter and collected your documents. Uninformed phone calls rarely accomplish anything and can create a confusing paper trail. Read first, then act.
Step-by-Step: Your First 48 Hours
Read the Denial Letter Carefully — All of It
The denial letter must, by law, contain: the specific reason for denial (with reference to plan language or clinical criteria), the date of the decision, your right to appeal, and the deadline for filing an appeal. Note the deadline — most plans give you 180 days from the denial date to file an internal appeal. Write it on your calendar immediately.
Request Your Complete Claim File
Submit a written request (email or letter) to your insurer asking for "the complete claim file and all clinical criteria, guidelines, protocols, or standards used in the adverse benefit determination." Under federal law, this must be provided free of charge before your appeal is decided. You need this to build your counter-argument.
Check Whether Your Situation Is Urgent
Is the denied service urgent? Is your health at risk while the denial stands? If yes, you may be entitled to an expedited internal appeal with a 72-hour decision deadline (ACA §2719). Expedited review applies when the standard timeline would "seriously jeopardize the life or health of the claimant." Use the word "expedited" explicitly in your appeal.
Talk to Your Physician — Today
Call your doctor's office and tell them the claim was denied. Ask two things: (1) Will they write a letter of medical necessity for your appeal? (2) Do they have experience with this insurer's appeal process? Physician letters are the single most important element of a successful appeal — get this conversation started immediately.
Check Your EOB (Explanation of Benefits)
Your Explanation of Benefits is separate from the denial letter. It shows exactly how the claim was processed, what codes were submitted, and what reason codes were applied. Compare the EOB to the denial letter — sometimes a coding error on the provider's side explains the denial and can be corrected with a simple resubmission rather than a full appeal.
Identify Your Appeal Type and Strategy
Read our guide to the 10 most common denial reasons to identify which type of denial you're facing. Each requires a different appeal strategy. A "not medically necessary" denial needs clinical evidence. A coding error needs a corrected claim. A parity violation may need a regulatory complaint alongside the appeal.
Start Building Your Appeal File
Create a folder (physical or digital) for everything related to this denial. Collect: the denial letter, your EOB, all medical records related to the denied treatment, your physician's notes and any letters of medical necessity, relevant published clinical guidelines, and all correspondence with your insurer. Every phone call should be followed by a written summary sent to the insurer confirming what was discussed.
Key Deadlines You Cannot Miss
| Appeal Stage | Your Deadline to File | Insurer Decision Deadline |
|---|---|---|
| Internal appeal (standard) | 180 days from denial | 60 calendar days |
| Internal appeal (urgent/expedited) | As soon as possible | 72 hours |
| Pre-service appeal | Before service is rendered | 30 calendar days |
| External review | 4 months from final denial (varies by state) | 45 days (standard), 72 hours (urgent) |
Missing the internal appeal deadline can permanently waive your right to an external review and legal remedies. Do not miss it for any reason.
Who Can Help You
- Your state's insurance commissioner: Can intervene in coverage disputes for fully-insured plans. Find yours at our state commissioner directory.
- Patient advocates: Many hospitals have patient advocates on staff who assist with insurance disputes at no cost.
- Healthcare attorneys: For high-value denials (tens of thousands of dollars), attorneys who work on contingency may take your case.
- Nonprofit patient advocacy organizations: Disease-specific organizations (American Cancer Society, NAMI, etc.) often have staff who help members with insurance appeals.
Use Our Free Tools
Don't start from scratch. Our appeal letter generator creates a customized letter based on your denial type in minutes. Our denial checklist walks you through every document you need to collect. And our appeal probability tool helps you estimate your chances before investing significant time.
Disclaimer: This article provides general information. Deadlines and procedures vary by plan type and state. For complex or high-value denials, consult a patient advocate or healthcare attorney. Last updated: March 2026.