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VA Technical Reference Model v 24.4

Composite Health Care System (CHCS)
Composite Health Care System (CHCS) Technology

General InformationGeneral Information help

Technologies must be operated and maintained in accordance with Federal and Department security and privacy policies and guidelines. More information on the proper use of the TRM can be found on the TRM Proper Use Tab/Section.

Website: Go to site
Description: The Composite Health Care System (CHCS) is a mainframe-based system that was developed using the Massachusetts General Hospital Utility Multi-Programming System (MUMPS) language. This technology allows clinicians to electronically perform patient appointment processes and scheduling, order laboratory tests, authorize radiology procedures, and prescribe medications.

This technology stores data in Cache Database and encrypts data at rest using Advanced Encryption Standard (AES) 128-bit encryption.

The ongoing support for Caché is being reduced as the product has been replaced by InterSystems Intuitive Reliable Interoperative Scalable (IRIS) for Health.

Please note that there is no dedicated webpage for this technology.
Technology/Standard Usage Requirements: Users must ensure their use of this technology/standard is consistent with VA policies and standards, including, but not limited to, VA Handbooks 6102 and 6500; VA Directives 6004, 6513, and 6517; and National Institute of Standards and Technology (NIST) standards, including Federal Information Processing Standards (FIPS). Users must ensure sensitive data is properly protected in compliance with all VA regulations. Prior to use of this technology, users should check with their supervisor, Information Security Officer (ISO), Facility Chief Information Officer (CIO), or local Office of Information and Technology (OI&T) representative to ensure that all actions are consistent with current VA policies and procedures prior to implementation.
Section 508 Information: This technology has not been assessed by the Section 508 Office. The Implementer of this technology has the responsibility to ensure the version deployed is 508-compliant. Section 508 compliance may be reviewed by the Section 508 Office and appropriate remedial action required if necessary. For additional information or assistance regarding Section 508, please contact the Section 508 Office at
Decision: View Decisions

Decision Source: TRM Mgmt Group
Decision Process: One-VA TRM v21.12
Decision Date: 12/29/2021 at 21:11:57 UTC
Introduced By: TRM Request
Vendor Name: Military Health System
- The information contained on this page is accurate as of the Decision Date (12/29/2021 at 21:11:57 UTC).