Claims
The links below provide access to a variety of resources related to filing Medicare claims, timely claim filing requirements, claims processing, reference tools, claims submission errors, common questions, and payment information. These resources will help guide you through the submission and processing of Medicare claims.
The system used to process your Medicare claims is called the Fiscal Intermediary Standard System (FISS). For more information about FISS, refer to the FISS Reference Guide which is available on the Educational Materials Web page.
General Claims Processing Information
The following provides general information about how claims are processed through FISS.
- Change Request 6960: Systems
Changes Necessary to Implement the Patient Protection and Affordable
Care Act (PPACA) Section 6404 - Maximum Period for Submission of Medicare
Claims Reduced to Not More Than 12 Months

- Common Working File
- Provider
Retention of Health Insurance Records
— Medicare
Claims Processing Manual (CMS
Pub 100-04, Ch. 1, §110)
Medicare Part A claims filing regulations and instructions apply regardless of whether you submit the CMS-1450 (UB-04) claim on paper or electronically. For information on Electronic Claims Filing refer to the Electronic Data Interchange (EDI) Services page and the How to Get Started—Electronic Billing Booklet. If you submit paper claims, refer to the Medicare Claims Processing Manual, Chapter 25,
for information on completing the UB-04 (CMS-1450) form.
The resources provided on our Web site are based upon Medicare regulations, instructions, and forms established by the Centers for Medicare & Medicaid Services (CMS).
Please refer to these resources when filing your claims with Cahaba.
Page last updated: June 23, 2010