ICD-10 PCS to ICD-9 PCS Procedure Code GEM

$447.50 / year

This dataset shows the 2016-2018 update of the Centers for Medicare and Medicaid Studies (CMS) public domain one-to-one applied general reimbursement mappings of the ICD-10-CM (diagnosis) and ICD-10-PCS (procedure) code systems to the ICD-9-CM Volume 1 (diagnosis) and ICD-9-CM Volume 3 (procedure) code systems respectively. These 2018 ICD-10-PCS codes are to be used for discharges occurring from October 1, 2016 through September 30, 2018.


The purpose of the GEMs is to create a useful, practical, code to code translation reference dictionary for both code sets, and to offer acceptable translation alternatives wherever possible. For each code set, it endeavors to answer this question: Taking the complete meaning of a code (defined as: all correctly coded conditions or procedures that would be classified to a code based on the code title, all associated tabular instructional notes, and all index references that refer to a code) as a single unit, what are the most appropriate translation(s) to the other code set.

The I-10 and I-9 GEMs are used to facilitate links between the diagnosis codes in I-9 volume 3 and the new I-10 code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

The I-10 to I-9 GEM contains an entry for every I-10 code. Not all I-9 codes are contained in the I-10 to I-9 GEM; the I-10 to I-9 GEM contains only those I-9 codes which are plausible translations of the I-10 codes. The translations given are based on the I-10 code looked up, the source system code in the I-10 to I-9 GEM. The I-10 to I-9 GEM can be used to convert I-9 based systems or applications to I-10 based applications, or create one-to-one backwards mappings (also known as a crosswalk) from incoming I-10 based records to I-9 based legacy systems.

Date Created


Last Modified




Update Frequency


Temporal Coverage

2016-10-01 to 2018-09-30

Spatial Coverage

United States


John Snow Labs; Centers for Medicare and Medicaid Services;

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Source License Requirements


Source Citation



Clinical Software, CCS, Clinical Classifications Software, Clinical Classifications Software for Services and Procedures, Code Book, ICD-10-CM Definition, ICD-10-CM Book, ICD-10-CM Manual, ICD-10-CM and ICD-10-PCS Coding Handbook, ICD 10 Codes List, ICD 10 Procedure Code, ICD 10 Codes, ICD Codes

Other Titles

ICD-10-PCS to ICD-9-CM Procedure Codes General Reimbursement Mappings Clinical Software, ICD-10-PCS to ICD-9-CM Procedure Codes General Reimbursement Mappings CCS, ICD-10-PCS to ICD-9-CM Procedure Codes General Reimbursement Mappings Clinical Classifications Software

YearYear or version of ICD-10 code when it was published.date-
ICD10PCS_Code3- or 7-digit ICD 10 PCS code that uniquely identifies an illness.string-
ICD9CM_CodeInternational Classification of Diseases 9th Revision Clinical Modification (I-9) left justified in 14-character field that uniquely identifies an illness.string-
YearICD10PCS CodeICD9CM CodeGeneral Equivalence Mapping