ICD-9-CM diagnosis code (retired)
099.51 — Other venereal diseases due to chlamydia trachomatis, pharynx
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 099.51
099.51 is an ICD-9-CM diagnosis code for other venereal diseases due to chlamydia trachomatis, pharynx. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to one ICD-10-CM code, A56.4 (Chlamydial infection of pharynx). The match is exact.
ICD-10-CM equivalents
- A56.4Chlamydial infection of pharynxexact match
Common questions about 099.51
What is the ICD-10 code for ICD-9 099.51?
- The GEMs map 099.51 to ICD-10-CM A56.4.
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.