ICD-9-CM procedure code (retired)
20.41 — Simple mastoidectomy
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 20.41
20.41 is an ICD-9-CM procedure code for simple mastoidectomy. 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 09BB0ZZ (Excision of Right Mastoid Sinus, Open Approach), 09BB3ZZ (Excision of Right Mastoid Sinus, Percutaneous Approach) and 09BB4ZZ (Excision of Right Mastoid Sinus, Percutaneous Endoscopic Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 09BB0ZZExcision of Right Mastoid Sinus, Open Approachapproximate
- 09BB3ZZExcision of Right Mastoid Sinus, Percutaneous Approachapproximate
- 09BB4ZZExcision of Right Mastoid Sinus, Percutaneous Endoscopic Approachapproximate
- 09BC0ZZExcision of Left Mastoid Sinus, Open Approachapproximate
- 09BC3ZZExcision of Left Mastoid Sinus, Percutaneous Approachapproximate
- 09BC4ZZExcision of Left Mastoid Sinus, Percutaneous Endoscopic Approachapproximate
Common questions about 20.41
What is the ICD-10 code for ICD-9 20.41?
- The GEMs map 20.41 to ICD-10-PCS 09BB0ZZ, 09BB3ZZ, 09BB4ZZ, 09BC0ZZ, 09BC3ZZ and 09BC4ZZ.
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.