User Support

Do Your own analysis
Explore Expert Research & Limited Datasets

Central Distributor SID: Description of Data Elements

AMDC - All Patient Refined MDC
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes

All Patient Refined MDC (AMDC) reports the MDC as determined by the APR system. The AMDC is supplied by the data source. During HCUP processing, the codes are assigned to the HCUP data element AMDC as reported, without modification.

For more information see "All Patient Refined Diagnosis Related Groups (APR-DRGs)," published by 3M Health Information Services.

Uniform Values
VariableDescriptionValueValue Description
AMDCAll Patient Refined MDCnnAPR MDC value
. or 0Missing
State Specific Notes


For Maine only, the ADRG and AMDC data elements contain the 3M All Patient DRG and MDC rather than the 3M All Patient Refined DRG and MDC. Source documentation indicates that the current version of the All Patient DRG (ADRG) is applied to the data.


For 2018 - Q4 and 2019 Q1-Q3, the APR-DRGs were incorrectly assigned for infants under the age of 1 year admitted after the date of birth and that had no birth weight reported.

Beginning 2016, Massachusetts provides the 3M Health Information Systems All Patient Refined (APR) DRG grouper Version 34.0.

From 2014 through 2015, Massachusetts provides the APR-DRG Version 30.0.

From 2009 through 2013, Massachusetts provides the Version 26.1 grouper to assign AMDC.

From October 2006 through September 2008, Massachusetts used the Version 20 grouper to assign AMDC. Beginning in October 2008, Massachusetts no longer provided the Version 20 grouper to assign AMDC. From October 1999 through September 2006, Massachusetts used Version 15. Prior to that, Massachusetts used the Version 12 grouper.


Source documentation does not include which version of the APR-DRG grouper was used.


Internet Citation: HCUP Central Distributor SID Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). May 2024. Agency for Healthcare Research and Quality, Rockville, MD.
Are you having problems viewing or printing pages on this website?
If you have comments, suggestions, and/or questions, please contact
Privacy Notice, Viewers & Players
Last modified 5/22/24