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IHCP Companion Guides

This page contains Indiana Health Coverage Programs (IHCP) companion guides for Health Insurance Portability and Accountability Act (HIPAA) version 5010 electronic transactions. The guides contain structure and specifications for transactions exchanged directly with Gainwell Technologies (fiscal agent for the IHCP). Providers and vendors developing software for electronic data interchange (EDI) may need to view multiple guides.

The IHCP companion guides are updated as needed. See the Change Summary section within each guide for a history of updates. When a system modification is forthcoming, significant changes are described in advance in the Upcoming Changes for IHCP Companion Guides section of this page.

The IHCP companion guides are intended only to supplement the adopted national electronic data interchange transaction set implementation guides. These implementation guides, published by the Washington Publishing Company, are available  through the X12 website at The IHCP companion guides are never intended to modify, contradict or reinterpret the rules established by the implementation guides.

IHCP Companion Guides

Name Date Updated
IHCP Connectivity Guide, Version 3.4 August 2019
TA1 and 999 Acknowledgements, Version 1.5 March 2022
270/271 Health Care Eligibility Benefit Inquiry and Response Transactions, Version 3.7 December 2021
276/277 Health Care Claim Status Request and Response Transactions, Version 3.3 July 2019
277U Health Care Payer Unsolicited Claim Status Response, Version 3.3 March 2022
820 MCE Capitation Payment Information Transaction, Version 3.9 June 2024
834 MCE Benefit Enrollment and Maintenance Transaction, Version 5.8 March 2023
835 Health Care Claim Payment/Advice Transaction, Version 3.3 May 2022
837D Health Care Claim: Dental Transaction, Version4.0 March 2022
837I Health Care Claim: Institutional Transaction, Version 3.8 March 2022
837P Health Care Claim: Professional Transaction, Version 3.9 January 2023


The IHCP companion guide for electronic prior authorization transactions, 278 Prior Authorization Request and Response, is available from the Key Links page of the Acentra Health website.

The IHCP companion guide for electronic pharmacy claim transactions, National Council for Prescription Drug Programs (NCPDP) D.0 Transaction Payer Sheet, is available from the Optum Rx Indiana Medicaid website.

Two IHCP companion guides for Dual Eligible Special Needs Plan (D-SNP) claim transactions – one for 837I and 837P claims, and one for pharmacy prescription drug events (PDEs) – are available on the Dual Eligible Special Needs Plans page on the IHCP partner website.

Upcoming Changes for IHCP Companion Guides

When system modifications are planned, advance notification is given to allow vendors time to make appropriate changes to their software and perform testing, if needed. The following documents describe upcoming changes to applicable IHCP companion guides. Please review these documents and make necessary modifications to your system before the implementation date.

Name Date Updated
No upcoming changes at this time

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