ICD-9-CM procedure code (retired)
18.31 — Radical excision of lesion of external ear
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 18.31
18.31 is an ICD-9-CM procedure code for radical excision of lesion of external ear. 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 09T00ZZ (Resection of Right External Ear, Open Approach), 09T04ZZ (Resection of Right External Ear, Percutaneous Endoscopic Approach) and 09T0XZZ (Resection of Right External Ear, External Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 09T00ZZResection of Right External Ear, Open Approachapproximate
- 09T04ZZResection of Right External Ear, Percutaneous Endoscopic Approachapproximate
- 09T0XZZResection of Right External Ear, External Approachapproximate
- 09T10ZZResection of Left External Ear, Open Approachapproximate
- 09T14ZZResection of Left External Ear, Percutaneous Endoscopic Approachapproximate
- 09T1XZZResection of Left External Ear, External Approachapproximate
Common questions about 18.31
What is the ICD-10 code for ICD-9 18.31?
- The GEMs map 18.31 to ICD-10-PCS 09T00ZZ, 09T04ZZ, 09T0XZZ, 09T10ZZ, 09T14ZZ and 09T1XZZ.
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.