MAX Inpatient File

The Medicaid MAX (Medicaid Analytic Extract) Inpatient (IP) file contains complete stay records for enrollees who had an inpatient hospital stay. Records include fee-for-service (FFS) claims and encounter records submitted for stays covered by Medicaid managed care.

What does this file include? (variable highlights)

  • 10 diagnosis code fields
  • 7 procedure code fields
  • Discharge status
  • Charges and payments (FFS only)
  • Provider identifier             

Special considerations

  • Encounter record reporting may not be complete. Data reporting may vary by state, year and eligibility group.

Availability of this file


CY 1999-2015

For calendar years 2014 and 2015, the CMS Medicaid research files will be in either the MAX or TAF format depending on when the state transitioned to T-MSIS data submissions.

MAX files in 2013, 2014, and 2015, while in the MAX file format, may have used T-MSIS data as the source data. Please see the state and year availability table: 

See what is in this file