ICD-9-CM procedure code (retired)
85.41 — Unilateral simple mastectomy
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 85.41
85.41 is an ICD-9-CM procedure code for unilateral simple mastectomy. 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 2 ICD-10-PCS codes, such as 0HTT0ZZ (Resection of Right Breast, Open Approach) and 0HTU0ZZ (Resection of Left Breast, Open Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 85.41
What is the ICD-10 code for ICD-9 85.41?
- The GEMs map 85.41 to ICD-10-PCS 0HTT0ZZ and 0HTU0ZZ.
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.