Humana Medicare Advantage Timely Filing Limit 2026: Deadlines, Exceptions & CO-29 Appeals

Humana Medicare Advantage Timely Filing Deadlines

Humana Medicare Advantage requires claims to be submitted within 365 days of the date of service. This is Humana's published claims policy, not a federal filing mandate, and your individual provider contract may specify a different window.

Timely filing denials — coded as CO-29 on remittances — are among the most preventable revenue losses in medical billing.

According to Humana's provider claims submission page, Medicare Advantage claims must be submitted "within one year from the date of service or as stipulated in the provider agreement." That qualifier matters: a contracted Humana MA agreement can set a shorter window. If your practice recently re-contracted with Humana — particularly following their 2026 MA market exits — verify the timely filing clause in your specific agreement.

The same page sets a separate rule for misrouted claims: if a claim was sent in error to another carrier or agency, the timely filing period begins on the date that carrier or agency notified you of the error.

For Humana commercial claims, the same page sets 90 days from date of service if no other state-mandated or contractual definition applies. Humana has exited the employer group commercial medical business, so most remaining commercial claims are legacy AR.

Timely Filing Deadlines by Plan Type

Humana's timely filing windows vary significantly by plan type: 365 days for Medicare Advantage, 90 days for commercial/employer plans, and state-specific for Medicaid. Contract terms can change any of these windows — verify before billing.

The table below covers Humana's standard timely filing windows across plan types. These reflect Humana's published policies — always verify against your specific provider agreement.

For most independent practices billing Humana Medicare Advantage, the controlling deadline is 365 days from date of service. Practices billing Humana commercial lines should default to 90 days unless the contract says otherwise.

Humana Appeal and Reconsideration Deadlines

Which appeal path applies depends on whether you participate in Humana's network. Humana's Reconsiderations and Appeals page gives non-participating providers 65 calendar days from the date of the denial to appeal a denied Medicare Advantage claim in writing. Participating providers are directed to the reconsideration process in Humana's provider manuals, so the window and steps come from your manual and contract, not this page.

A timely filing denial is not always the end. If you receive a CO-29 denial and have documentation proving the claim was submitted on time, you can appeal it.

For a non-participating provider's appeal of a denied MA claim, the federal timelines for a payment reconsideration apply (42 CFR 422.590(b)):

Expedited (72-hour) reconsiderations are for pre-service coverage decisions only. Federal rules exclude requests for payment of services already furnished, so a CO-29 claim appeal is always standard (42 CFR 422.584(a)).

Humana's 65-day window runs from the date of the denial, not the date you received it. Open denial correspondence immediately — delays in your mail room can eat into this window.

How to Submit a Humana Reconsideration

Submit Humana MA appeals and disputes for finalized claims through Availity Essentials, which confirms receipt and lets you check status. Non-participating providers can also mail them to P.O. Box 14165, Lexington, KY 40512-4165, but mail gives you no receipt confirmation.

For a complete Level 1 reconsideration letter with 2026-specific language, see the Medicare Advantage appeal letter template 2026.

Humana accepts provider reconsiderations through two primary channels:

Online (Preferred): Submit through Availity Essentials. Humana's page says the online tool confirms receipt, shows status, and shows high-level determinations for completed requests. It covers finalized claims only, not overpayment or Provider Payment Integrity disputes.

Availity Essentials — step-by-step for CO-29 appeals (per Humana's Reconsiderations and Appeals page):

1. Sign in to Availity Essentials and open the Claim Status tool
2. Locate the denied claim and select Dispute Claim on the claim details screen. This adds the claim to your appeals worklist but does not submit it to Humana
3. Open the worklist from Claims & Payments → Appeals
4. Upload proof of timely submission (277CA acknowledgment, portal confirmation, or certified mail receipt)
5. If the denial also carries a medical necessity code, attach clinical records in the same submission
6. Submit the appeal to Humana from the worklist and record the confirmation. Don't resubmit an appeal you already sent by mail; Humana says duplicates may delay processing

Mail (non-participating providers, Medicare Advantage):

Humana Inc.
P.O. Box 14165
Lexington, KY 40512-4165

Puerto Rico providers:
Humana Inc.
Unidad de Querellas y Apelaciones
P.O. Box 195560
San Juan, PR 00919-5560

Provider claims inquiries: 800-457-4708, Monday–Friday, 8am–8pm ET.

Required documents for any CO-29 appeal:

• Copy of the original claim
• Remittance notification showing the CO-29 denial
• Proof of timely submission (see section below)
• Clinical records if the appeal also involves medical necessity
• Non-participating providers: a signed Waiver of Liability form holding the enrollee harmless, regardless of the outcome

Fighting CO-29 Denials: Proof of Timely Filing

A Humana CO-29 denial requires documented proof of timely submission — Humana does not grant exceptions without it. The strongest proof is a 277CA clearinghouse acknowledgment report showing the submission timestamp inside the filing window. Portal confirmation emails and certified mail receipts are also accepted.

A CO-29 denial is effectively non-appealable without documentation proving the claim was submitted within the filing window. Humana does not make exceptions based on goodwill — you need a paper trail.

What counts as proof:

• Electronic submissions: A 277CA transaction acceptance report or clearinghouse batch confirmation with a timestamp showing the submission date. This is the gold standard and should be archived for every claim.
• Paper/fax submissions: Certified mail receipt with postmark date, or a fax confirmation sheet showing the date, time, page count, and recipient fax number.
• Portal submissions: A submission confirmation email or screenshot from Availity showing the filed date.

Corrected Claim Timely Filing: Humana Medicare Advantage

The timely filing limit for corrected claims (CMS-1500 frequency code 7) submitted to Humana Medicare Advantage is the same 365-day window from the date of service as the original claim. Humana does not grant an extended filing period because a claim is a resubmission — the 365-day clock starts from the date of service and does not reset when a corrected claim is submitted.

This distinction matters operationally: if your original claim was denied for a billing error on day 300 of the filing window, you have approximately 65 days remaining to file the corrected claim — not a fresh 365 days. Many practices discover billing errors from denial remittances that arrive 60–90 days after service, assuming the correction restarts the clock. It does not.

Corrected claim vs. CO-29 reconsideration — these are distinct adjudication tracks in Humana's system:

A corrected claim (frequency code 7) is the right move when the original claim contained a billing error that caused outright rejection or incorrect processing — wrong NPI, incorrect diagnosis code, missing modifier, or mismatched rendering provider. A CO-29 reconsideration is the right move when Humana's TFL determination is wrong — meaning the claim was submitted on time and you have documentation to prove it. Submitting a CO-29 appeal argument on a corrected claim, or vice versa, causes Humana to process them on mismatched tracks and delays resolution without resetting any deadlines.

Submitting a corrected claim through Availity Essentials:

1. Log in at availity.com → Claims & Payments → Claims
2. Locate the original claim → select Create Corrected Claim
3. Select frequency type 7 — Replacement of Prior Claim
4. Correct only the specific field(s) that caused the error — do not alter clinical information unless it was documented incorrectly
5. Enter the original claim number in box 22 (Resubmission Code)
6. Submit — Availity generates a new claim number immediately; record it for follow-up
7. Do not attach a CO-29 appeal argument to this submission — it triggers a separate queue and delays both processes

For a complete guide covering frequency code 7 vs. 8, plan-type differences for corrected claims, D-SNP coordination rules, and CO-29 appeal steps specific to corrected submissions, see the Humana MA Corrected Claim Timely Filing Limits 2026. For how Humana's corrected claim rules compare to UHC, Cigna, Anthem BCBS, and Aetna, see the Corrected Claim Timely Filing Limits 2026 guide.

Timely Filing Exceptions Humana Recognizes

Humana's provider claims page publishes one exception to the one-year window: a claim sent in error to another carrier or agency. The other situations below are arguments to raise with documentation, not published Humana rules. Humana does not grant exceptions on assertion alone, so attach proof to every exception request.

Misrouted claim (published): If the claim was submitted in error to a carrier or agency other than Humana, the timely filing period begins on the date that carrier or agency notified you of the error, per Humana. Attach the other payer's rejection or denial notice.

Other primary coverage (COB): When Humana is the secondary payer, document the primary payer's payment or denial date. Humana's 2026 Illinois Dual Fully Integrated (HMO D-SNP) billing guide starts the filing clock on the date of payment or notification of nonpayment from the primary payer. That guide covers one plan; confirm the rule in your own manual or contract before relying on it. Attach the primary payer's remittance.

Retroactive eligibility: If the member's Humana MA enrollment was applied retroactively after the date of service, request in writing that Humana measure the window from the date enrollment was posted. Humana does not publish this as a rule on its claims page, so include the retroactive enrollment confirmation and get Humana's answer in writing.

Payer or clearinghouse error: If Humana's systems or a clearinghouse error caused the delay, document it with the EDI 277CA rejection or Humana correspondence and ask Humana to exclude that period. Call 800-457-4708 to confirm the delay and request written confirmation.

Declared disasters: Humana does not publish an automatic disaster extension on its claims page. During a declared emergency, check Humana's provider news and your contract for any temporary filing relief before assuming it applies.

For exception requests, submit a cover letter identifying the specific exception, the documentation supporting it, and the relevant timeline.

Timely Filing Rules by Humana MA Plan Subtype

Humana's published one-year window does not vary by MA plan subtype, but TFL failure risk does. Dual-eligible special needs plans (D-SNPs) add a second payer: Humana pays as the member's Medicare coverage, and Medicaid pays the remaining cost-sharing second. The Medicaid side's own filing rules are where late-filing risk concentrates.

Humana MA HMO plans (the most common Humana MA type): Claims are limited to participating providers. If a provider's credentialing or roster status with Humana lapses, submitted claims may reject on eligibility rather than timely filing — but providers discover the denial months later, after the correction window has narrowed. Check active par status in Humana's provider directory (provider.humana.com) before submitting high-value claims for new patients.

Humana MA PPO plans: Accept in-network and out-of-network claims, both subject to the 365-day window. Out-of-network claims sometimes generate a PR-96 (member responsibility) remark code alongside CO-29 on the same remittance. PR-96 alongside CO-29 signals a coverage question, not a pure timely filing denial — the appeal argument must address both. Treating it as a standard CO-29 reconsideration without addressing the PR-96 results in a second denial.

Humana Gold Plus HMO-SNP and other D-SNPs: A Humana MA plan is the member's Medicare coverage. It is not secondary to Original Medicare, so there is no "Medicare EOB" to wait for before billing Humana. Bill Humana within its one-year window from the date of service. For dual-eligible members, Medicaid is the payer that comes second. If the state Medicaid program pays the cost-sharing separately, its own crossover filing deadline applies. In Humana's fully integrated D-SNPs, where Humana also administers the Medicaid benefit, the 2026 Illinois billing guide starts the filing clock on the date the Medicare claim was adjudicated for services Medicare covers. Check your own state's guide for the equivalent rule.

Corrected claims vs. formal CO-29 appeals: If a billing error caused the initial claim to deny or fail adjudication entirely — wrong NPI, incorrect diagnosis code, missing modifier — submitting a corrected claim (frequency code 7) is faster and more effective than a formal CO-29 appeal. A corrected claim goes back through claims processing; it does not reset the filing window. An appeal reviews Humana's existing determination and has its own deadline (65 days from the denial for non-participating providers; your manual for participating providers). Use the appeal only when the original claim was submitted on time and Humana's TFL determination is wrong.

2026 Context: What Changed with Humana MA

Humana's published MA filing window for 2026 remains one year from the date of service. However, Humana's significant market exits and plan reconfigurations mean many providers were re-contracted, which can alter timely filing clauses in individual agreements.

Humana executed significant Medicare Advantage market contractions for 2026, exiting multiple counties and plan types. Key implications for timely filing:

• Re-contracted providers: If your Humana MA agreement was re-papered for 2026, your timely filing clause may have changed. Verify before assuming the prior contract terms carry over.
• Reduced prior authorization requirements: Humana reduced its 2026 MA prior auth requirements for certain services, which may decrease the volume of denied claims — but does not change timely filing rules.
• Humana's published window is unchanged: Humana's provider claims page still lists one year from the date of service for MA claims, unless the provider agreement says otherwise.

For broader context on how Humana's denial rates compare to other major payers, see Insurance Denial Rates by Company 2026. For CO-29 denials beyond timely filing — including medical necessity and prior authorization denials from Humana MA — see the Humana Denied Claim Guide 2026.

How Muni Appeals Helps with Humana Timely Filing Denials

CO-29 denials are preventable and recoverable — but only if your billing workflow captures the right documentation at the right time and your appeal is filed inside the controlling window.

Muni Appeals prepares the Humana reconsideration draft and evidence checklist for staff review:

• Surfaces a likely CO-29 timely-filing issue from an uploaded Humana MA remittance for staff verification
• Surfaces appeal-window risk from the uploaded denial; staff verifies and calendars the controlling deadline
• Lists the 277CA confirmation evidence staff should upload and attach as proof of timely filing
• Generates Humana-specific reconsideration drafts with likely mailing guidance and a documentation checklist for staff verification
• Provides Availity follow-up guidance while staff records confirmation and monitors reconsideration status
• Staff reviews and approves the draft, downloads the packet, submits it to Humana, and records payer confirmation and status

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Frequently Asked Questions

What is the Humana Medicare Advantage timely filing limit?

Humana requires initial claims to be filed within 365 days (one year) of the date of service "or as stipulated in the provider agreement," per its provider claims page. Individual provider agreements may specify a different window — verify your contract.

What is the Humana appeal deadline after a denial?

Non-participating providers have 65 calendar days from the date of the denial to appeal a denied Medicare Advantage claim. The clock starts from the denial date, not the date you received the letter. For a payment appeal, Humana has 60 calendar days to decide or forward the case to the IRE under 42 CFR 422.590(b). Participating providers follow the reconsideration process and deadlines in their Humana provider manual and contract.

What is a CO-29 denial from Humana?

CO-29 is the standard Claim Adjustment Reason Code for timely filing denials — it means the claim was submitted after the contractual or regulatory filing deadline. To appeal a CO-29 from Humana, you need documented proof that the claim was submitted within the window (typically a clearinghouse acceptance report).

Can Humana deny an appeal because of timely filing?

Yes, if your appeal is filed after the deadline (65 calendar days from the denial for non-participating providers, or your manual's deadline for participating providers), Humana can deny it on timeliness grounds. File as soon as you receive a denial.

Does Humana have a timely filing exception for retroactive eligibility?

Humana's provider claims page does not publish one; the only exception it lists is for claims sent in error to another carrier. If the member's enrollment was applied retroactively after the service date, request in writing that Humana measure the window from the date enrollment was posted, and attach the retroactive enrollment documentation.

How do I prove timely filing to Humana?

The best documentation is a 277CA clearinghouse acknowledgment report with a timestamp showing your submission date within the filing window. For fax or mail submissions, use a certified mail receipt or fax confirmation sheet. For portal submissions, a confirmation email or screenshot showing the submission date is sufficient.

Where do I mail a Humana Medicare Advantage reconsideration?

Non-participating providers mail Medicare Advantage appeals to: Humana Inc., P.O. Box 14165, Lexington, KY 40512-4165 (Puerto Rico: P.O. Box 195560, San Juan, PR 00919-5560). Online submission through Availity Essentials is preferred because it confirms receipt. Participating providers should use the address in their provider manual.

What is the timely filing limit for corrected claims in Humana Medicare Advantage?

The timely filing limit for a corrected claim (CMS-1500 frequency code 7) submitted to Humana Medicare Advantage is 365 days from the original date of service — the same window as the initial claim. Humana does not grant an extended period for corrections or resubmissions; the 365-day clock begins on the date of service and does not reset when you file a corrected claim.

Does submitting a corrected claim to Humana reset the timely filing clock?

No. Submitting a corrected claim (frequency code 7) to Humana Medicare Advantage does not reset the timely filing clock. The 365-day window runs from the date of service. If a billing error is discovered on day 300, you have the remaining days in the original window — not a new 365-day period. Practices that assume the clock resets often discover the claim is now outside the TFL window when Humana processes the corrected submission.

Is Humana's timely filing limit the same for commercial plans?

No. Humana's default timely filing window for commercial claims is 90 days from date of service if no state-mandated or contractual window applies, compared to one year for Medicare Advantage. Humana has exited the employer group commercial medical business, so these are mostly legacy claims. Always check the plan type before billing.

Ready to Stop Losing Revenue to CO-29 Denials?

Timely filing denials are recoverable — but only within a fixed window. For non-participating providers on Humana MA, that window is 65 days from the denial date. After that, the claim is gone.

Get Started:

• CO-29 denial and deadline-risk guidance from uploaded Humana MA remittances for staff verification
• Reconsideration deadline-risk guidance per claim for staff verification
• Humana-specific reconsideration drafts and filing-evidence checklists for staff review
• Staff uploads and verifies proof of timely filing, then approves and downloads the packet for submission
• Staff submits the approved, downloaded packet and records payer confirmation and status, including Availity follow-up

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This guide reflects 2026 Humana Medicare Advantage timely filing policies based on Humana's published provider portal guidance (provider.humana.com) and CMS Medicare Advantage regulations. Individual provider agreements may specify different timely filing windows. Verify your specific contract terms before relying on the general deadlines above. State requirements may also vary. For related Humana appeal guidance, see our Humana Appeal Letter Template 2026 and Humana Medical Necessity Letter Template 2026.