Insurance appeal deadlines for 2026: UnitedHealthcare requires 65 days for all plan types (the shortest among major commercial insurers). Aetna, Blue Cross Blue Shield, Cigna, and Humana allow 180 days for commercial plans. All Medicare Advantage plans require 60 days under CMS rules — regardless of which insurer administers the plan. These are appeal deadlines; claim submission (timely filing) windows are separate and longer. As of January 1, 2026, Medicare Advantage plans must also decide standard prior authorization requests within 7 calendar days under CMS-0057-F.
Why the Right Deadline Is Everything
Missing an appeal deadline — even by one day — results in automatic rejection. The insurance company doesn't review the merits. The claim closes permanently.
This isn't a procedural inconvenience. For practices managing dozens of open appeals across multiple payers, a single missed UHC deadline (65 days) looks identical on the calendar to an Aetna deadline (180 days) unless you're tracking them separately by payer.
The two deadlines billing teams confuse most:
- Timely filing limit (TFL): How long you have to submit the original claim after the date of service — typically 90–365 days
- Appeal filing deadline: How long you have to appeal a denial after receiving the denial notice — typically 60–180 days
Getting these wrong in either direction costs money. Filing a TFL denial as an appeal delays the corrected claim and may forfeit both paths.
Deadline Starts on the Denial Date — Not the Date You Read It
Appeal deadlines are calculated from the date printed on the denial notice, not the date your billing team opened it. A letter dated October 1 with a 65-day UHC deadline expires December 5 — even if it sat in the mail pile until October 15.
2026 Insurance Appeal Deadlines: Complete Table by Payer
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| Payer | Plan Type | Appeal Deadline | Claim TFL Window | Expedited Decision |
|---|---|---|---|---|
| Aetna | Commercial | 180 days | 90 days (varies by contract) | 72 hours |
| Aetna | Medicare Advantage | 60 days | 365 days (CMS federal rule) | 72 hours |
| Aetna | Medicaid | State-specific | State-specific | 72 hours |
| Blue Cross Blue Shield | Commercial (most affiliates) | 180 days | 90–365 days (plan-specific) | 72 hours |
| Blue Cross Blue Shield | Medicare Advantage | 60 days | 365 days (CMS federal rule) | 72 hours |
| Blue Cross Blue Shield | Medicaid | 60–180 days (state-specific) | State-specific | 72 hours |
| UnitedHealthcare | Commercial | 65 days | 90–365 days (plan-specific) | 72 hours |
| UnitedHealthcare | Medicare Advantage | 65 days | 365 days (CMS federal rule) | 72 hours |
| UnitedHealthcare | Medicaid | State-specific | State-specific | 72 hours |
| Cigna | Commercial | 180 days | 90–180 days | 72 hours |
| Cigna | Medicare Advantage (HealthSpring) | 60 days | 365 days (CMS federal rule) | 72 hours |
| Cigna | Medicaid | State-specific | State-specific | 72 hours |
| Humana | Commercial | 180 days | 90–180 days | 72 hours |
| Humana | Medicare Advantage | 65 days | 365 days (CMS federal rule) | 72 hours |
| Humana | Medicaid | 60 days | State-specific | 72 hours |
| Premera Blue Cross | Commercial / Standard | 180 days | 365 days from service date | 72 hours |
| Premera Blue Cross | Heritage Plans | 365 days | 365 days | 72 hours |
| Premera Blue Cross | Medicare Advantage | 60 days | 365 days (CMS federal rule) | 72 hours |
Key takeaway: Most commercial plans give you 180 days, but UHC's 65-day standard is 2.5× shorter. Medicare Advantage plans follow CMS minimums: 60 days for appeals, 365 days for claim submission. Plan-specific contracts may vary — always verify against your denial notice.
What Changed in 2026: CMS-0057-F and CMS-4208-F
Two federal rules took effect January 1, 2026 with direct implications for how practices manage Medicare Advantage appeals.
CMS-0057-F: Prior Authorization Decision Timelines
The CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F) now requires Medicare Advantage plans, Medicaid managed care plans, and QHP issuers on the Federally Facilitated Exchanges to:
- Decide standard prior authorization requests within 7 calendar days (previously 14 days)
- Decide expedited (urgent) PA requests within 72 hours
- Provide a specific reason for every PA denial — vague "not medically necessary" language no longer meets compliance requirements
This applies to medical and behavioral health services — it does not cover drug PA decisions.
For practices appealing PA denials from MA plans in 2026: if the plan exceeded the 7-day standard or failed to give a specific denial reason, document it in your appeal. Both are grounds for challenging the process, not just the clinical decision.
CMS-4208-F: Retroactive Denial Ban for Inpatient MA Admissions
Effective January 1, 2026, Medicare Advantage plans generally cannot retroactively deny inpatient hospital admissions that were previously approved — either before admission or during the stay. The only exceptions are fraud or obvious error.
If you're dealing with a retroactive MA inpatient denial for a stay that was approved at admission, cite CMS-4208-F directly in your appeal. This is a new compliance requirement, not a gray area.
2026 Regulatory Summary for MA Appeals
As of January 1, 2026: (1) MA plans must respond to standard PA requests within 7 days, not 14; (2) All PA denials require a specific stated reason; (3) Previously approved inpatient admissions generally cannot be retroactively denied. These changes apply to MA appeals filed on or after January 1, 2026.
Payer-by-Payer Appeal Deadline Details
Aetna: 180 Days Commercial, 60 Days Medicare Advantage
How Aetna counts the deadline: From the date printed on the denial notice, in calendar days. No automatic extensions; late appeals are rejected without merit review.
State exceptions apply for fully insured commercial plans — California, New York, and Texas have specific state-level requirements. Provider contracts may grant additional time.
Where to file:
- Online: Aetna.com provider portal via Availity (fastest)
- Mail: Aetna Appeals Department, P.O. Box 14463, Lexington, KY 40512-4463
- Fax: 1-859-425-3379 (standard), 1-859-425-3380 (expedited)
Decision timeline: Standard 30 days; expedited 72 hours. Federal law: failure to respond by deadline = automatic approval.
→ Full Aetna Appeal Guide 2026 | Aetna Timely Filing Limits
Blue Cross Blue Shield: 180 Days — But 34 Companies, Not One
BCBS is 34 independent companies. Your deadline depends on which affiliate issued the denial, not "BCBS" as a category.
| BCBS Company | Appeal Deadline | State(s) |
|---|---|---|
| Anthem BCBS | 180 days | 14 states incl. CA, NY, OH, IN, VA |
| Blue Cross NC | 180 days | North Carolina |
| CareFirst BCBS | 180 days | MD, DC, Northern VA |
| BCBS Michigan | 180 days | Michigan |
| BCBS Texas (commercial) | 180 days | Texas |
| BCBS Texas (STAR Medicaid) | 60 days | Texas |
| Premera Blue Cross (standard) | 180 days | Washington, Alaska |
| Premera Blue Cross (Heritage) | 365 days | Washington, Alaska |
| Florida Blue | 180 days | Florida |
The most common billing error with BCBS: filing the appeal with the wrong company. The plan ID on the member's card identifies the home plan. Appeals go to the home plan, even when the patient received care in a different state.
For out-of-state BCBS patients (BlueCard), the home plan's clinical criteria govern, not the host state's — appeal goes to the home plan identified by the alpha prefix on the member's ID card.
→ BCBS Timely Filing Limits 2026 | Full BCBS Appeal Guide
UnitedHealthcare: 65 Days — All Plan Types
This is the most commonly missed deadline in commercial insurance. Practices that manage Aetna and BCBS denials on a 180-day cadence often find UHC appeals sitting unworked at day 70.
The 65-day window applies to commercial, Medicare Advantage, and Part D plans. There is no 90-day or 180-day UHC commercial track.
UHC may grant extensions if you request one before the deadline expires, citing good cause (serious illness, hospitalization, administrative error by UHC). "Busy practice" does not qualify.
Where to file:
- Portal: UHCprovider.com (required for most network providers as of January 2025)
- Phone: 1-866-480-1086
- Fax or mail: See your denial notice for plan-specific address
Decision timeline: Standard 7 calendar days — the fastest among major insurers. Expedited: 72 hours.
→ UHC Appeal & Timely Filing Deadlines 2026 | UHC Appeal Letter Template
Cigna: 180 Days Commercial, 60 Days Medicare Advantage
Standard commercial window: 180 days from initial denial or payment date. Second-level appeals for Cigna HealthCare for Seniors (HealthSpring MA): 60 days from first-level decision.
Cigna-specific workflow note: Peer-to-peer (P2P) review often resolves Cigna denials same-day and does not count as a formal appeal. Request P2P immediately after denial — before filing. If P2P fails, you still have the full 180-day appeal window.
→ Cigna Timely Filing Limits 2026 | Cigna Appeal Guide
Humana: 180 Days Commercial, 65 Days Medicare Advantage
Commercial plans: 180 days. Medicare Advantage plans: 65 days (Humana-specific — CMS sets a 60-day minimum for all MA plans). Medicaid plans: 60 days.
→ Humana Medicare Advantage Timely Filing 2026
Medicare Advantage (All Plans): 60 Days
Regardless of which insurer administers the plan, all Medicare Advantage plans must accept appeals within a minimum of 60 calendar days from the denial notice. This is a CMS federal requirement — individual plans may set longer windows, but not shorter.
New in 2026 (CMS-0057-F): Standard PA decisions must be issued within 7 days; expedited PA decisions within 72 hours. If a plan misses these timelines, the request auto-escalates to external review.
For a full walkthrough of the 5-level MA appeal ladder (plan → QIC → OMHA → MAC → federal court) and AIC thresholds, see our Medicare Advantage appeal guide.
How to Calculate Your Exact Deadline
Step 1 — Find the denial notice date. Look for "Date of Determination," "Date of Decision," or "Notice Date." This is Day 0.
Step 2 — Apply your payer's window:
- Aetna, BCBS (most), Cigna, Premera (standard): 180 calendar days
- UHC (all plans), Humana MA: 65 calendar days
- Medicare Advantage (all): 60 calendar days minimum
- Humana Medicaid: 60 calendar days
Step 3 — Count calendar days, not business days. Weekends and holidays count. If the deadline falls on a weekend or federal holiday, most insurers extend to the next business day — but don't rely on it.
Step 4 — File before the deadline. If the deadline is March 30, file by March 28. For mail, use certified mail — postmark date counts, not arrival date. For online submissions, the timestamp must be before midnight on the deadline day.
Decision Timelines: How Long the Insurer Has to Respond
| Insurance Company | Standard Decision | Expedited Decision | If They Miss the Deadline |
|---|---|---|---|
| Aetna | 30 days | 72 hours | Automatic approval (federal law) |
| BCBS (most affiliates) | 30 days | 72 hours | Automatic approval |
| UnitedHealthcare | 7 days | 72 hours | Move to external review immediately |
| Cigna | 30 days (pre-service) / 60 days (post-service) | 72 hours | Automatic approval |
| Humana | 30 days | 72 hours | Automatic approval |
| Premera Blue Cross | 30 days | 72 hours | Automatic approval |
| MA Plans (CMS-0057-F, eff. Jan 1 2026) | 7 days (PA requests) | 72 hours (PA requests) | Auto-escalates to external IRE |
Under 29 CFR 2560.503-1, if an insurer fails to respond within the required timeframe, the appeal is either automatically approved or deemed exhausted — allowing you to proceed directly to external independent review without completing internal appeals.
Expedited Appeals: The 72-Hour Standard
Any denial qualifies for expedited review (72-hour decision) if the standard timeline would:
- Seriously jeopardize the patient's life or ability to regain maximum function
- Cause severe pain that cannot be managed without the treatment
- Disrupt ongoing treatment (hospital stay, infusion series, etc.)
Many states have expanded this definition beyond immediately life-threatening situations to include severe pain affecting daily function, risk of disability, or mental health crises.
How to request it: Include this in your appeal cover letter:
I am requesting EXPEDITED review under [Insurance Company]'s urgent
appeal procedures per [State] regulations and 29 CFR 2560.503-1.
Delay in receiving [treatment] will [specific medical harm with timeline].
Physician documentation of urgent medical need is attached.
For prior authorization denials specifically — and the new CMS-0057-F timelines that apply in 2026 — see our prior authorization denial appeal guide.
What to Do If You Missed Your Appeal Deadline
Good Cause Exceptions
Most insurers and Medicare will consider late appeals if you document "good cause" for missing the deadline.
Accepted reasons:
- Serious illness or hospitalization that physically prevented filing
- Death or critical illness of an immediate family member
- Natural disaster that destroyed records or prevented access
- Insurance company gave you incorrect deadline information (documented)
- Denial notice never received (proof of non-delivery required)
- Administrative error by the insurer caused the delay
Not accepted: Being busy, forgetting, not understanding the process, or waiting to gather documentation.
How to file a late appeal with good cause: Act immediately — the further past the deadline, the lower the odds. Your cover letter should state the specific circumstance with dates, explain why you couldn't file on time, and note when you discovered the missed deadline and took immediate action. Attach documentation (hospital records, insurer correspondence, certified mail receipts).
Timely Filing Denial vs. Missed Appeal Deadline
If you received a CO-29 denial (timely filing), that's different from missing an appeal deadline. CO-29 denials are claim submission issues — appealed with proof of timely filing (submission confirmation, clearinghouse logs, EOB showing prior processing). For decision logic by denial code — CO-4, CO-16, CO-29, CO-97 — the key question is whether the denial reflects a billing error (corrected claim) or a clinical dispute (formal appeal).
For external review timelines and ERISA lawsuit windows, see our insurance appeal statute of limitations guide.
How Muni Tracks Appeal Deadlines
Manual tracking breaks at scale. A 15-provider practice running 40+ active appeals across UHC (65-day), Aetna (180-day), and Medicare Advantage (60-day) plans needs payer-aware deadline automation, not a shared spreadsheet.
Muni Appeals identifies the payer from the denial, calculates the correct deadline by plan type, and sends alerts at 90, 60, 30, 14, and 7 days. It adjusts for state-specific variations and flags the difference between TFL windows and appeal windows.
Frequently Asked Questions
What is the shortest insurance appeal deadline among major payers?
UnitedHealthcare at 65 days (all plan types including Medicare Advantage). This is the most commonly missed deadline because billing teams often assume the standard 180-day commercial window applies.
Do Medicare Advantage plans all have the same appeal deadline?
CMS sets a minimum of 60 calendar days for all MA appeals. Individual plans may set longer windows, but none can be shorter than 60 days. UHC and Humana both implement 65-day windows for their MA plans as part of a uniform commercial/MA policy.
What's the difference between a timely filing deadline and an appeal deadline?
Timely filing (TFL) is how long you have to submit the original claim after the date of service — typically 90–365 days depending on the payer and plan type. An appeal deadline is how long you have to contest a denial after receiving the denial notice — 60–180 days. A CO-29 TFL denial requires different handling than a standard clinical denial appeal. Never file a corrected claim using the appeal process, or vice versa.
Did the 2026 CMS rules change any appeal deadlines?
The appeal deadlines themselves did not change. What changed under CMS-0057-F (effective January 1, 2026) is the timeline for prior authorization decisions in Medicare Advantage plans — 7 calendar days standard, 72 hours expedited. And CMS-4208-F (also effective January 1, 2026) limits MA plans from retroactively denying previously approved inpatient admissions. These affect the grounds and context for appeals, not the 60-day filing window.
My denial letter doesn't list an appeal deadline. What do I do?
Federal law (29 CFR 2560.503-1) requires all denial notices to include the reason for denial, the appeal deadline, and instructions for filing. If this information is missing, the insurer violated procedural requirements. File your appeal immediately and note in your cover letter that the denial notice failed to include required appeal rights information per 29 CFR 2560.503-1. You may also file a complaint with your state insurance commissioner's office.
Can I file a partial appeal by the deadline and supplement later?
Yes. File the appeal with whatever documentation you have by the deadline. Include a cover letter stating: "Initial appeal filed to meet [payer] deadline. Supplemental clinical documentation to follow by [date, typically 10–14 days]." Most insurers allow supplemental submissions during active review. The deadline governs when you initiate the appeal, not when all documentation must be received.
What happens if the insurance company misses their own decision deadline?
Under federal law (29 CFR 2560.503-1), if the insurer fails to issue a decision within the required timeframe (typically 30 days standard, 72 hours expedited), the appeal is either deemed approved or the internal appeals are deemed exhausted — allowing you to move directly to external independent review. For ERISA plans, this is a significant procedural protection. Document the submission date and track the decision deadline to the day.
What is the deadline for external review after an internal appeal is denied?
External review deadlines vary by state, ranging from 4–6 months after internal appeal denial. Federal minimum is 4 months. California (IMR) gives 6 months; New York gives 4 months. Your internal denial letter must state your external review rights and deadline. For a full breakdown, see our insurance appeal statute of limitations guide and our independent review organization guide.
This guide reflects 2026 insurance appeal procedures, including CMS-0057-F and CMS-4208-F changes effective January 1, 2026. Appeal deadlines vary by insurance company, plan type, and state. Information provided represents standard timelines for major insurers — your specific plan or provider contract may have different requirements. Always verify your exact deadline from your denial notice and confirm with the insurance company. Muni Appeals tracks current deadlines for Aetna, Blue Cross Blue Shield, UnitedHealthcare, Cigna, Humana, Premera, and all Medicare Advantage plans.