Dataset: SNOMED CT to ICD-10-CM Map.

Fung K


Mapping SNOMED CT codes to and from ICD codes

SNOMED CT is clinically-based, and oriented for direct use by healthcare providers, to document whatever is needed for patient care. ICD codes are oriented more for coding professionals to use after patient care has already been provided, for statistical data collection and billing. ICD codes lump less common diseases together in "catch-all" categories, for example, J15.8 Pneumonia due to other specified bacteria, which could result in loss of information. SNOMED Ct has more "granular" (specific) clinical coverage than ICD:SNOMED CT (clinical finding) has 100,000 codes, ICD-10-CM has 68,000 codes, and ICD-9-CM has 14,000 codes.

Due to the differences in granularity, emphasis and organizing principles between SNOMED CT and ICD-10-CM, it is not always possible to have a one-to-one map between a SNOMED CT concept and an ICD-10-CM code. To address this challenge, the SNOMED CT to ICD-10-CM Map follows an approach that is consistent with the approach used by the IHTSDO and WHO.  When there is a need to choose between alternative ICD-10-CM codes, each possible target code is represented as a “map rule” (the essence of “rule-based mapping”). Related map rules are grouped into a “map group”. Map rules within a map group are evaluated in a prescribed order at run-time, based on contextual information and co-morbidities. Each map group will resolve to at most one ICD-10-CM code. In the event that a SNOMED CT concept requires more than one ICD-10-CM code to fully represent its meaning, the map will consist of multiple map groups.

We have created the SNOMED CT to ICD-10-CM Map to support semi-automated generation of ICD-10-CM codes from clinical data encoded in SNOMED CT for reimbursement and statistical purposes.

  • Download:
    • Latest release in September 2014 provides ICD-10-CM maps for 54,262 SNOMED CT concepts
    • Third release (35,000 SNOMED CT concepts mapped to ICD-10-CM) is anticipated for June 2013.
    • Second release was in July 2012 (15,000 SNOMED CT concepts mapped to ICD-10-CM).
    • First release was in February 2012 (7000 SNOMED CT concepts mapped to ICD-10-CM).

Fung K Dataset: SNOMED CT to ICD-10-CM Map.