Encrypted State Assigned Beneficiary Unique Identifier

SAS Name

A state-assigned unique identification number used to identify a Medicaid/CHIP enrolled beneficiary and any claims submitted to the system. Also referred to as the Medicaid Statistical Information System Identifier (MSIS_ID).


The MSIS ID is unique only within a state for a year; a beneficiary’s MSIS ID may change longitudinally. Additional details are provided in the User Guide


This variable is encrypted in the CCW and may not be joined to any other data sets without CMS permission.

Source: T-MSIS Annual Demographic and Eligibility TAF


Alphanumeric character string, 32 characters
(Ex- 9Q81866B302C768A539BBE79FFB835FB)
Code Code value
Null/missing source value is missing or unknown