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SNOMED International APG Parser

SNOMED CT Compositional Grammar

SNOMED CT compositional grammar is a lightweight syntax for representing SNOMED CT expressions. SNOMED CT expressions are used in electronic health records (EHRs) to represent clinical meanings in a way that enables automatic interpretation. They are also used to define precoordinated concepts and to represent maps between SNOMED CT and other terminologies.

This parser validates an input string according to the ABNF syntax defined for SNOMED CT compositional grammar v2.3.1 (

The Input String: (edit and click "Parse")

The Parser's Output: