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

Source License URL

John Snow Labs Standard License

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-