ICD-9-CM procedure code (retired)
99.27 — Iontophoresis
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 99.27
99.27 is an ICD-9-CM procedure code for Iontophoresis. 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 3E00XGC (Introduction of Other Therapeutic Substance into Skin and Mucous Membranes, External Approach) and 3E013GC (Introduction of Other Therapeutic Substance into Subcutaneous Tissue, Percutaneous Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 99.27
What is the ICD-10 code for ICD-9 99.27?
- The GEMs map 99.27 to ICD-10-PCS 3E00XGC and 3E013GC.
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.