Why Appeal Deadlines Are Non-Negotiable
Unlike most business decisions, missed appeal deadlines have no recovery path. There is no late filing exception. There is no grace period. Once the window closes, the payer has a contractual and regulatory basis to reject your appeal — and they will use it. The claim amount is permanently written off.
This isn't an edge case. Industry data from MGMA shows that deadline expiration is among the top five reasons for unrecovered denied claims. The typical mid-size practice processes hundreds of denials per month across multiple payers, each with different windows. Without a system that tracks denial dates against payer-specific deadlines, claims expire silently — and your practice loses revenue it was already owed.
A practice with $250,000 in annual denied claims that misses deadlines on just 15% of those claims loses $37,500/year permanently — revenue it had already earned and been denied for. At a 60% appeal overturn rate, working those claims before expiration would recover $22,500 of it. Deadline management is revenue management.
Quick-Reference: Appeal Deadlines by Payer
All deadlines below are measured from the denial date on the EOB/ERA unless otherwise noted. This table covers the first-level appeal (reconsideration or redetermination). Subsequent appeal levels have their own deadlines that begin from the prior decision date.
| Payer | Deadline | Measured From | Submission Method | Urgency |
|---|---|---|---|---|
| UnitedHealthcare | 65 days | EOB/RA denial date | Online portal (preferred) or mail | ⚠️ Most Restrictive |
| Medicare (Traditional) | 120 days | MSN or RA date | Written — MACs have specific addresses | Multi-level process; clock resets each level |
| Aetna | 90 days | Denial date on EOB | Provider portal or mail; P2P within 30 days | P2P preferred for medical necessity |
| BCBS (varies by state) | 90–180 days | Denial date on EOB | Online portal or mail (plan-specific) | Verify on specific EOB — state plans vary |
| Cigna | 90 days | Denial date on EOB | Provider portal (preferred) or mail; P2P within 30 days | P2P strongly preferred for medical necessity |
| Humana | 180 days | Denial date on EOB | Provider portal or mail | Longest commercial window; still don't delay |
| Medicaid (varies by state) | 30–90 days | Denial date (state-specific) | State-specific — often paper only | Some state windows are very short — verify immediately |
Deadlines above apply to commercial/standard plans for each carrier. Self-funded employer plans (ASO), Medicare Advantage (MA), and Medicaid Managed Care plans follow the underlying carrier's process but may have different timelines. Always verify on the specific EOB and call the provider line if you're within 30 days of what you believe the deadline is.
UnitedHealthcare — 65 Days
UHC's 65-day window is the most restrictive commercial payer deadline in the United States. With most other payers giving 90–180 days, billing teams that treat UHC the same as everyone else will systematically expire claims. A denial received on Day 1 that isn't flagged for appeal until Day 50 leaves only 15 days for documentation gathering, physician review, and submission.
Required documentation by denial type:
- CO-16 / Missing Information: Corrected claim with the missing field populated; cover letter identifying the original denial date and specific item corrected
- CO-18 / Duplicate: Proof of original submission (confirmation number, clearinghouse report), cover letter explaining why the duplicate occurred
- CO-4 / Missing Modifier: Corrected claim with appropriate modifier; coding rationale if queried
- Medical Necessity (CO-5, CO-9): Physician letter of medical necessity specific to this patient and service, clinical notes, prior auth documentation if applicable
UHC strongly prefers portal submissions via the UnitedHealthcare Provider Portal. Mailed appeals are accepted but add 5–7 days of processing time — do not mail an appeal if you're within 14 days of the deadline. Peer-to-peer reviews for UHC medical necessity denials must be requested within 45 days of the denial date.
Medicare — 120 Days
Medicare's appeal process has five levels, each with its own deadline that begins from the prior level's decision date. The 120-day window applies only to Level 1 (Redetermination). Understanding the full chain matters because higher-level appeals (ALJ Hearing, MAC Review) can recover significant claim dollars that Redetermination denies.
Medicare appeals levels and timelines:
- Level 1 — Redetermination: 120 days from MSN/RA denial date → file with your MAC
- Level 2 — Reconsideration: 180 days from Redetermination decision → file with Qualified Independent Contractor (QIC)
- Level 3 — ALJ Hearing: 60 days from Reconsideration decision → file with OMHA (≥$160 threshold for 2026)
- Level 4 — MAC Review: 60 days from ALJ decision → Medicare Appeals Council
- Level 5 — Federal Court: 60 days from MAC decision → district court (≥$1,760 threshold)
Required documentation for Medicare Redetermination: Redetermination Request Form (or letter equivalent), original claim number, statement of the issue, supporting medical records for medical necessity denials, advance beneficiary notice (ABN) for waiver denials if applicable, and physician attestation where clinically disputed.
Aetna — 90 Days
Aetna's standard commercial appeal deadline is 90 days from the denial date. For medical necessity denials, Aetna's peer-to-peer review option must be requested within 30 days — missing the P2P window forces you into the slower written appeal process, which has lower success rates for clinical denials. P2P review decisions are typically returned within 24–72 hours, making it the fastest path for high-value medical necessity claims.
Required documentation by denial type:
- Billing/Administrative errors: Corrected claim via Availity portal, cover letter citing specific error and correction made
- Medical necessity (CO-5, CO-9, CO-50): Physician letter of medical necessity, chart notes, clinical guidelines supporting the service (cite payer-specific clinical policy bulletin if available)
- Prior authorization denials: Auth request documentation, provider attestation that service was urgent/emergent if applicable, clinical notes supporting the authorization criteria
Aetna processes most commercial appeals through the Availity portal. Self-funded (ASO) employer plans may route differently — always verify submission address on the EOB.
BlueCross BlueShield — 90–180 Days (Varies by State)
BCBS is not a single payer — it is a federation of 36 independent state licensees. Anthem BCBS (operating in 14 states) typically follows a 180-day window. Other state plans vary. Specific deadlines for high-volume state plans:
- Anthem BCBS (CA, IN, OH, VA, NY, GA, MO, CT, NH, ME, WI, CO, NV, NH): 180 days standard
- BCBS Texas / Wellmark BCBS (IA, SD): 90–180 days — verify on EOB
- BCBS Illinois / Florida / Michigan / New Jersey: 180 days for most commercial plans
- Highmark BCBS (PA, WV, DE): 180 days standard
- BCBS Federal Employee Program (FEP): 90 days — separate OPM-governed process
The rule: always verify on the specific EOB. Do not assume 180 days for any BCBS plan. If the EOB does not state a deadline, call the provider line and request the plan's appeal timeframe in writing before proceeding.
Cigna — 90 Days
Cigna's standard commercial appeal deadline is 90 days. Cigna is notable for strongly preferring peer-to-peer review over written appeals for medical necessity denials — their published overturn rate for P2P reviews substantially exceeds written appeal outcomes for the same denial codes. P2P reviews must be requested within 30 days of the denial date.
Cigna's tiered appeal process:
- Level 1 — Post-Service Appeal: 90 days from denial. Submit corrected claim or written appeal through Cigna for Health Professionals portal
- Level 2 — Second Level Appeal: 60 days from Level 1 denial decision. Additional documentation or new clinical evidence required
- External Review: Available after exhausting internal appeals for clinical/medical necessity denials under ERISA-governed plans
Required documentation for Cigna appeals:
- Administrative/billing denials: Corrected claim, cover letter with specific correction, proof of prior submission if arguing CO-18
- Medical necessity denials: Clinical notes from date of service, physician letter, applicable Cigna Medical Coverage Policies (cite policy number), peer-reviewed literature for off-label or emerging treatments
Humana — 180 Days
Humana offers the most generous deadline among major commercial payers at 180 days. This window is helpful for complex medical necessity appeals that require specialist documentation, peer-reviewed literature, or multi-physician attestations. However, don't let the 180-day window become license to deprioritize Humana denials — high-dollar claims that sit until Day 150 are high-risk if documentation becomes difficult to gather.
Humana appeals process overview:
- Level 1 — Reconsideration: 180 days from denial date. Submit via Availity or mail
- Level 2 — Appeal: 60 days from Level 1 decision. Additional information must demonstrate new grounds
- External Review: Available after internal appeals exhausted for fully-insured plans under state law
- Humana MA Plans: Follow CMS-regulated MA appeals process; expedited appeals available for urgent clinical situations
Humana processes most appeals through Availity. For Humana Medicare Advantage denials, the process follows CMS MA regulations — expedited appeals must be decided within 72 hours for urgent medical situations, and standard MA appeals within 60 days.
Medicaid — Varies by State (Often 30–90 Days)
Medicaid is the most variable payer in the country for appeal deadlines because it is state-administered under federal CMS guidelines. Some states have 30-day windows. Most are 60–90 days. A few states allow up to 180 days. The deadline is always published on the state's denial notice — never assume.
Selected state Medicaid appeal deadlines (verify current rules with your MAC/state Medicaid agency):
- California Medi-Cal: 90 days
- Texas Medicaid: 90 days (120 days for CHIP)
- Florida Medicaid: 90 days
- New York Medicaid: 90 days
- Ohio Medicaid: 60 days
- Illinois Medicaid: 60 days
- Pennsylvania Medicaid: 30 days (one of the strictest)
For Medicaid Managed Care (MCO) plans, appeals go to the MCO (Molina, Centene, WellCare, AmeriHealth, etc.) following that carrier's process. Managed Care appeal timelines are governed by the MCO's contract with the state — often 60–90 days but verify on each denial.
What Happens When You Miss the Deadline
The consequences are simple and permanent: the claim is unrecoverable. Let's translate that into business terms.
| Practice Size (Annual Revenue) | Avg. Annual Denied Claims (7% denial rate) | Missed Appeals @ 15% deadline expiration | Unrecoverable at 60% overturn rate |
|---|---|---|---|
| Solo Practice ($500K) | $35,000 | $5,250 | $3,150/year |
| Small Group ($1.5M) | $105,000 | $15,750 | $9,450/year |
| Mid-Size Group ($3.5M) | $245,000 | $36,750 | $22,050/year |
| Large Group ($8M+) | $560,000 | $84,000 | $50,400/year |
| The real cost: permanently lost revenue that was already earned | $0 recoverable after deadline | ||
The revenue impact compounds because missed deadlines aren't random — they cluster in problem areas. If UHC is your highest-volume payer and your team doesn't have a UHC-specific 65-day flag, you're consistently expiring your largest payer's appeals. A single high-volume payer miss can account for the majority of your total annual deadline losses.
Options after a missed deadline:
- File anyway with documentation of extenuating circumstances: Most payers reject late appeals outright. Document the reason (natural disaster, verified payer processing error, serious illness) and submit with a cover letter. Success rate: very low.
- File a formal grievance: A complaint about the payer's conduct — not about the denial. This does not result in claim payment and has very low success rates for reversing the underlying denial.
- State insurance department complaint: Appropriate if you have documented evidence of payer bad faith. Slow, uncertain, and claim-specific disputes are often outside the regulator's scope.
- Negotiate the write-off: For self-pay or out-of-network claims, negotiate directly with the patient. Not applicable for in-network commercial plans.
There is no universally recognized grace period for appeal deadlines. A claim filed on Day 66 for a UHC denial is subject to rejection as definitively as a claim filed six months late. The only cure is proactive deadline management — not appeals to payer discretion after the fact.
Building a Deadline Tracking System
The practices with the lowest denial write-off rates share one common trait: they treat denial dates like invoice due dates. Every denial that enters the system gets a deadline calculated and visible. Every high-priority denial (UHC, short-window Medicaid) gets escalated immediately.
Minimum viable deadline tracking process:
- Pull denied claims from your practice management system or ERA/EOB daily — not weekly
- For each denial, record: payer name, denial date, claim amount, CARC code, and calculated appeal deadline
- Sort by deadline date ascending — shortest window claims work first, always
- Flag UHC denials for same-day or next-day action
- Set an internal deadline 14 days before the payer deadline for all claims
- Track appeal submission confirmation numbers — confirm receipt within 5 business days
Your denied claims CSV already contains most of this data: denial date, payer, CARC code, and claim amount. The missing piece is payer-specific deadline calculation — which is exactly what a denial audit tool can automate across your full denial backlog.
Not sure which of your current denials are approaching deadlines? Upload your denied claims CSV at vigil-ai-2.polsia.app and the tool calculates payer-specific appeal deadlines for every claim, flags approaching expirations, and ranks your denial backlog by urgency. Takes 60 seconds. No account required.
Related Resources
Deadlines are step one — knowing how to file a winning appeal is step two. For the full appeal workflow including documentation templates and payer-specific submission tips, see the Medical Claim Appeal Guide.
To understand which CARC denial codes are worth appealing (and which are contractual write-offs with low success rates), see the CARC Denial Code Reference. High-dollar codes with high win rates (CO-18, CO-4, CO-16) deserve immediate attention when approaching deadlines.
For data on denial rates by payer, practice size, and specialty, see Medical Billing Denial Statistics 2026. Understanding your payer's average denial rate gives context for how aggressively to pursue each carrier.