A prefix for each ICD-9-CM code that is supplied, which indicates whether that particular code is for a principal or other diagnosis, principal or other procedure, external cause or morphology.
Used for epidemiological research, casemix studies; severity of illness analyses; resource utilisation and planning purposes.
Only one diagnosis may be specified as the principal diagnosis and only one procedure may be specified as the principal procedure.
Implementation in Metadata Sets
-
Diagnosis; ICD-9