What Is an External Review?
When your insurance company denies your internal appeal, you have one more option: an Independent External Review (IER). This is a free, neutral review by a physician outside the insurance company who decides if the insurer was right or wrong.
The breakthrough: A neutral physician often sees the case differently than the insurance company's medical director. They're not incentivized to deny—they're incentivized to get the case right.
Success rates: 40-60% of external reviews overturn the insurer's denial. This is 2-3x higher than the 15-25% internal appeal overturn rate.
How External Review Works (6 Steps)
Wait for Internal Appeal Denial (30-45 Days)
You must exhaust your internal appeal first. Insurance has 30-45 days to respond. When they deny, you become eligible for external review.
Important: Request written explanation of the internal appeal denial. You need this for external review.
Request External Review (No Deadline, But Don't Wait)
Contact your state insurance commissioner or the independent external review organization. Rules vary by state. Most states have 4-year windows to file.
Pro tip: File within 30 days of the internal appeal denial. This shows urgency and keeps the case fresh.
Prepare Your External Review Package (1-2 Weeks)
Submit the same materials as your internal appeal, plus:
- The internal appeal denial letter
- Updated clinical evidence if anything has changed
- A brief summary letter from you (1 page) explaining why you disagree
- Your physician's statement of continued medical belief
Insurer Submits Their Response (5-7 Days)
The insurance company submits their clinical reasoning to the external review organization. You may get to see this and respond.
Independent Physician Reviews Both Sides (10-20 Days)
A neutral physician (usually a specialist in your field) reads both your materials and the insurer's materials. They decide: is the treatment medically necessary or not?
The magic: This physician has no financial incentive to deny. They're paid a flat fee, not per denial. This changes everything.
Decision & Notification (30-60 Days Total)
The external review organization notifies you and the insurer of the decision. If approved, the insurer must pay the claim. If denied, you're out of options.
Internal appeal: Insurance company reviews their own decision. They have financial incentive to stand by it. 15-25% overturn rate.
External review: Independent physician who has never seen the case decides. No financial incentive either way. 40-60% overturn rate.
The independence matters.
Timeline: How Long Does External Review Take?
- Standard external review: 30-60 days
- Expedited external review (urgent/life-threatening): 72 hours (some states offer this)
- Total from denial to external review decision: 90-120 days
Request expedited review if: The treatment is time-sensitive (cancer, cardiac, etc.). Most states allow expedited external review for urgent cases.
What Happens After External Review Decision?
If Approved (You Win)
The insurer must pay the claim. This is binding. They can't appeal an external review decision—you win.
If Denied (You Lost All Options)
This is the end of the line clinically. Your remaining options are:
- Complaint to state insurance commissioner — Creates regulatory pressure, but won't overturn the decision
- Litigation — File a lawsuit for breach of contract. Expensive but an option for large claims
- Accept the denial — Unfortunately, sometimes you lose
State-by-State External Review Rules
Rules vary significantly by state. Key variations:
- Who decides? Some states use state agencies, others use independent organizations
- Cost to you? Always free to the patient (insurer pays)
- Time limit to file? Usually 4 years, but some states 1 year. Check our state-specific appeal guides.
- Timeline: Most states 30-60 days for standard review, 72 hours for expedited. States like New York often have stronger protections.
- Coverage: Some states only allow external review for certain issues (medical necessity, not all denials)
Check your state insurance commissioner's website for specific rules. Or contact your state's external review organization directly. If you're on ACA marketplace coverage, your state commissioner can guide you through external review.
A patient was denied joint replacement surgery with CO-50 (not medically necessary). The insurer's reviewer said, "Conservative treatment should be tried first." The internal appeal failed. See our CO-50 guide on this exact scenario.
In external review, the patient's orthopedic surgeon testified that conservative treatment was contraindicated due to the patient's advanced arthritis. The independent physician agreed and overturned the denial. Claim approved. Surgery happened. Patient recovered.
This case never would have been approved on internal appeal. External review changed the outcome.
How to Win an External Review
The independent physician needs to understand:
- What the insurer said was wrong — Address their specific objection
- Why this treatment is medically necessary for THIS patient — Not why it's generally accepted, but why this specific patient needs it
- That you've exhausted other options — Show you tried conservative treatment, prior appeals, etc.
- That the clinical evidence is clear — Use guidelines, peer-reviewed studies, specialist recommendations