ICD-9-CM procedure code (retired)
27.21 — Biopsy of bony palate
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 27.21
27.21 is an ICD-9-CM procedure code for biopsy of bony palate. 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 6 ICD-10-PCS codes, such as 0C920ZX (Drainage of Hard Palate, Open Approach, Diagnostic), 0C923ZX (Drainage of Hard Palate, Percutaneous Approach, Diagnostic) and 0C92XZX (Drainage of Hard Palate, External Approach, Diagnostic). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 0C920ZXDrainage of Hard Palate, Open Approach, Diagnosticapproximate
- 0C923ZXDrainage of Hard Palate, Percutaneous Approach, Diagnosticapproximate
- 0C92XZXDrainage of Hard Palate, External Approach, Diagnosticapproximate
- 0CB20ZXExcision of Hard Palate, Open Approach, Diagnosticapproximate
- 0CB23ZXExcision of Hard Palate, Percutaneous Approach, Diagnosticapproximate
- 0CB2XZXExcision of Hard Palate, External Approach, Diagnosticapproximate
Common questions about 27.21
What is the ICD-10 code for ICD-9 27.21?
- The GEMs map 27.21 to ICD-10-PCS 0C920ZX, 0C923ZX, 0C92XZX, 0CB20ZX, 0CB23ZX and 0CB2XZX.
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.