Internal vs. External Appeal: Which One Do You Need?

When your health insurance claim is denied, the word "appeal" covers two very different processes with different rules, different decision-makers, and different outcomes. Understanding the distinction between an internal appeal and an external review is essential — each plays a specific role in your path to coverage, and using them in the right sequence is the key to winning.

What Is an Internal Appeal?

An internal appeal is a formal request for your insurance company to reconsider its denial decision. The review is conducted by the insurer itself — typically by a different set of reviewers than those who made the original denial.

Key characteristics of internal appeals:

  • Decision-maker: Your insurance company's own internal reviewers or medical directors.
  • Timeline: 30 days for pre-service (before you receive care) standard decisions; 60 days for post-service (after you receive care); 72 hours for expedited/urgent cases.
  • Filing deadline: 180 days from the denial notice date (federal minimum).
  • Cost: Free.
  • Binding? If the insurer upholds the denial, it is not the end of the road — you can proceed to external review.

Your internal appeal package should include a formal appeal letter, a Letter of Medical Necessity from your physician, supporting medical records, and any clinical guidelines supporting the prescribed treatment.

What Is an External Review?

An external review (also called an Independent External Review or Independent Medical Review) takes the decision completely out of your insurer's hands. Your case is submitted to an accredited Independent Review Organization (IRO) — a third-party company staffed by medical experts with no connection to your insurer.

Key characteristics of external reviews:

  • Decision-maker: An independent medical expert at an IRO, typically a specialist in the relevant medical field.
  • Timeline: 45 days for standard decisions; 72 hours for expedited/urgent cases.
  • Filing deadline: 60 days from the final internal denial (federal minimum).
  • Cost: Free (nominal fee in some states, refunded if you win).
  • Binding? Yes. The IRO's decision is legally binding on your insurer. If they overturn the denial, the insurer must pay.

The Standard Sequence: Internal First, Then External

In most cases, you must complete the internal appeal process before you can request an external review. The typical sequence is:

  1. Receive denial → Review your EOB and denial codes
  2. File internal appeal (within 180 days of denial)
  3. Wait for internal decision (30/60/72 hours depending on urgency)
  4. If internal appeal upheld → Request independent external review (within 60 days of final internal denial)
  5. Await external review decision (45 days/72 hours)
  6. If external review upholds denial → Consider escalation options including state DOI complaint and legal action

When Can You Skip Directly to External Review?

In limited circumstances, you may be able to bypass or abbreviate the internal appeal process:

  • Insurer procedural failure: If your insurer fails to comply with internal appeal requirements (e.g., missing response deadlines), you may be deemed to have exhausted internal appeals automatically.
  • Concurrent filing (some states): California's DMHC allows you to file an IMR request concurrently with your internal appeal in urgent cases. Check your state's rules.
  • Insurer waives requirement: The insurer may voluntarily waive the requirement to exhaust internal appeals.

Which Types of Denials Qualify for External Review?

Under ACA rules, external review is available for any adverse benefit determination based on:

  • Medical necessity, appropriateness, health care setting, level of care, or effectiveness of a covered benefit
  • Experimental or investigational treatment determinations
  • Coverage rescissions

External review is generally not available for denials based purely on plan coverage exclusions (e.g., cosmetic procedures that the plan simply does not cover at all) — though even here, the line can be blurry and worth testing.

For a full overview of your rights at each stage, see the insurance appeal process guide and the external review guide.

Frequently Asked Questions

Do I have to complete the internal appeal before requesting an external review?
In most cases, yes — you must exhaust your internal appeal options before requesting an external review. However, there are exceptions: if your insurer fails to follow proper internal appeal procedures, if the plan waives the requirement, or in certain urgent situations (particularly in California and some other states), you may be able to request external review concurrently.
Is the external review decision truly binding on the insurer?
Yes. Under the ACA, an Independent Review Organization's decision in an external review is legally binding on the insurer. If the IRO overturns the denial, the insurer must pay the claim. This is not a recommendation — it is a final determination.
What does an external review cost?
External reviews are free to patients. You may be required to pay a nominal administrative fee (typically $25 or less) in some states, which is refunded if the IRO overturns the denial. Most patients pay nothing for an external review.
Can I add new information to an external review that was not in my internal appeal?
Yes. You can submit additional evidence, updated medical records, or new letters from your physician when you request external review. The IRO will consider all information submitted, including new documentation. This is another reason not to give up after an internal denial — new evidence can change the outcome.

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