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ICD-9-CM procedure code (retired)

21.91 — Lysis of adhesions of nose

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 21.91

21.91 is an ICD-9-CM procedure code for lysis of adhesions of nose. 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 09NK8ZZ (Release Nasal Mucosa and Soft Tissue, Via Natural or Artificial Opening Endoscopic), 09NKXZZ (Release Nasal Mucosa and Soft Tissue, External Approach) and 09NM8ZZ (Release Nasal Septum, Via Natural or Artificial Opening Endoscopic). All of these are approximate matches, so review the record to pick the right one.

ICD-10-PCS equivalents

Common questions about 21.91

What is the ICD-10 code for ICD-9 21.91?

The GEMs map 21.91 to ICD-10-PCS 09NK8ZZ, 09NKXZZ and 09NM8ZZ.

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.