ICD-9-CM procedure code (retired)
24.91 — Extension or deepening of buccolabial or lingual sulcus
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 24.91
24.91 is an ICD-9-CM procedure code for extension or deepening of buccolabial or lingual sulcus. 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 0CN40ZZ (Release Buccal Mucosa, Open Approach), 0CN43ZZ (Release Buccal Mucosa, Percutaneous Approach) and 0CN4XZZ (Release Buccal Mucosa, External Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 24.91
What is the ICD-10 code for ICD-9 24.91?
- The GEMs map 24.91 to ICD-10-PCS 0CN40ZZ, 0CN43ZZ and 0CN4XZZ.
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.