ICD-9-CM procedure code (retired)
20.31 — Electrocochleography
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 20.31
20.31 is an ICD-9-CM procedure code for Electrocochleography. 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 4 ICD-10-PCS codes, such as F13ZK7Z (Electrocochleography Assessment using Electrophysiologic Equipment), F13ZKZZ (Electrocochleography Assessment) and F13ZL7Z (Auditory Evoked Potentials Assessment using Electrophysiologic Equipment). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
Common questions about 20.31
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.