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ICD-9-CM procedure code (retired)

20.91 — Tympanosympathectomy

ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-PCS equivalents from the CMS General Equivalence Mappings.

About ICD-9-CM 20.91

20.91 is an ICD-9-CM procedure code for Tympanosympathectomy. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-PCS took over.

The CMS General Equivalence Mappings translate it to 3 ICD-10-PCS codes, such as 01BK0ZZ (Excision of Head and Neck Sympathetic Nerve, Open Approach), 01BK3ZZ (Excision of Head and Neck Sympathetic Nerve, Percutaneous Approach) and 01BK4ZZ (Excision of Head and Neck Sympathetic Nerve, Percutaneous Endoscopic Approach). All of these are approximate matches, so review the record to pick the right one.

ICD-10-PCS equivalents

Common questions about 20.91

What is the ICD-10 code for ICD-9 20.91?

The GEMs map 20.91 to ICD-10-PCS 01BK0ZZ, 01BK3ZZ and 01BK4ZZ.

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.