EDI Resources
Companion Guides
Medicare Fee-for-Service Companion Guides | CMS![]()
- Home Health Notice of Admission 837I Companion Guide

- Hospice Notice of Election 837I Companion Guide

- Standard Companion Guide Health Care Claim: Institutional (837I)

- Standard Companion Guide Health Care Claim: Payment/Advice (835)

- Standard Companion Guide Health Care Claim: Status Request and Response (276/277)

Job Aids
- 999 277CA Examples Job Aid

- ASC X12N v005010 - Understanding the 999 Implementation Acknowledgement

- ASC 837I Version 5010A2 Institutional Health Care Claim to the CMS-1450 Claim Form Crosswalk

Manuals
- Fiscal Intermediary Standard System (FiSS) Direct Data Entry (DDE) User Manual
- GPNet Communications Manual

Newsletters
Self-Service Tools
Top Provider Questions
Published: 06.09.2026

