ICD-9-CM procedure code (retired)
99.85 — Hyperthermia for treatment of cancer
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 99.85
99.85 is an ICD-9-CM procedure code for hyperthermia for treatment of cancer. 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 DWY18ZZ (Hyperthermia of Head and Neck), DWY28ZZ (Hyperthermia of Chest) and DWY38ZZ (Hyperthermia of Abdomen). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 99.85
What is the ICD-10 code for ICD-9 99.85?
- The GEMs map 99.85 to ICD-10-PCS DWY18ZZ, DWY28ZZ, DWY38ZZ, DWY48ZZ, DWY58ZZ and DWY68ZZ.
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.