What is Medicare Advantage (CMS MA Part C Plans)'s timely filing limit for initial claims?

Medicare Advantage (CMS MA Part C Plans) enforces an initial claim timely filing deadline of 365 calendar days from Date of Service (under federal CMS MA guidelines).

How many days do you have to appeal a denial with Medicare Advantage (CMS MA Part C Plans)?

Appeals and payment disputes with Medicare Advantage (CMS MA Part C Plans) must be filed within 60 calendar days for beneficiary appeals / 180 days for provider payment disputes.

What is the secondary claim timely filing limit for Medicare Advantage (CMS MA Part C Plans)?

Secondary claims for Medicare Advantage (CMS MA Part C Plans) must be submitted within 180 days from primary EOB date.

Medicare Advantage Medicare Advantage / Part C 365 Days Limit

Medicare Advantage (CMS MA Part C Plans) Timely Filing Limit & Appeal Deadlines

Official filing rules, submission windows, appeal timeframes, and acceptable electronic clearinghouse proof for billing Medicare Advantage (CMS MA Part C Plans).

Initial Claim Limit

365 Days from DOS

Secondary Claim Limit

180 Days from EOB

Level 1 Appeal Limit

60 Days

Level 2 Dispute Limit

60 Days

1. Initial Claim Submission Deadline

365 calendar days from Date of Service (under federal CMS MA guidelines)

Clean electronic 837P or 837I claims must be received and acknowledged by Medicare Advantage (CMS MA Part C Plans) within this window. If a claim is rejected on front-end clearinghouse validation (Level 2), it is not considered received by Medicare Advantage (CMS MA Part C Plans) until corrected and successfully re-transmitted.

2. Specific Filing Rules for Medicare Advantage

Under 42 CFR § 422.504, Medicare Advantage plans must adhere to federal timely filing standards (up to 120-365 days depending on provider contract).

Contracted network plans cannot enforce less than 90-120 days under state MA guidelines.

Non-contracted providers have 60 calendar days from denial notice to file a formal organization determination appeal with Waiver of Liability.

3. Accepted Proof of Timely Filing

Official Proof Required by Medicare Advantage

Electronic 277CA clearinghouse gateway receipt or CMS Part C health plan portal submission receipt.

Important: Screenshots from your internal billing software or electronic health record (EHR) showing the date a claim was created are not accepted by Medicare Advantage as proof of submission. You must supply clearinghouse 277CA acceptance reports.

4. Appeal Letter Template for Medicare Advantage

Use this standardized appeal letter to overturn a CO-29 timely filing denial when you have verifiable clearinghouse proof:

RE: Timely Filing Denial Appeal (CO-29)
Payer: Medicare Advantage (CMS MA Part C Plans)
Patient Name: [Patient Name] | Member ID: [Member ID]
Date of Service: [Date of Service] | Claim ID: [Claim Number]
Billed Charges: $[Billed Amount]

Dear Appeals Coordinator,

We are submitting this formal appeal in response to the timely filing denial (CO-29) issued on the Explanation of Benefits dated [Remittance Date]. Under our participating agreement with Medicare Advantage (CMS MA Part C Plans), the timely filing limit is 365 calendar days from the date of service.

The original claim was electronically transmitted and received prior to the timely filing limit expiration. Enclosed please find Exhibit A: The clearinghouse Electronic Data Interchange (EDI) 277CA Claims Acknowledgment Report confirming successful gateway acceptance on [Date of Initial EDI Transmission] with Payer Claim Control Number [ICN / CCN].

Because this documentation constitutes conclusive objective proof of timely electronic submission, we respectfully request that the claim be reprocessed and approved for reimbursement.

Sincerely,
[Billing Manager / Practice Representative]
[Practice Name]
[Phone Number]