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ICD-9-CM diagnosis code (retired)

836.4 — Dislocation of patella, open

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 836.4

836.4 is an ICD-9-CM diagnosis code for dislocation of patella, open. 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 2 ICD-10-CM codes, such as S81.009A (Unspecified open wound, unspecified knee, initial encounter) and S83.006A (Unspecified dislocation of unspecified patella, initial encounter). All of these are approximate matches, so review the record to pick the right one. Some mappings are combinations: more than one ICD-10 code is needed to fully express the ICD-9 code.

ICD-10-CM equivalents

Common questions about 836.4

What is the ICD-10 code for ICD-9 836.4?

The GEMs map 836.4 to ICD-10-CM S81.009A and S83.006A.

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.