ICD-9-CM procedure code (retired)
02.91 — Lysis of cortical adhesions
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 02.91
02.91 is an ICD-9-CM procedure code for lysis of cortical adhesions. 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 00N00ZZ (Release Brain, Open Approach), 00N03ZZ (Release Brain, Percutaneous Approach) and 00N04ZZ (Release Brain, Percutaneous Endoscopic Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 00N00ZZRelease Brain, Open Approachapproximate
- 00N03ZZRelease Brain, Percutaneous Approachapproximate
- 00N04ZZRelease Brain, Percutaneous Endoscopic Approachapproximate
- 00N10ZZRelease Cerebral Meninges, Open Approachapproximate
- 00N13ZZRelease Cerebral Meninges, Percutaneous Approachapproximate
- 00N14ZZRelease Cerebral Meninges, Percutaneous Endoscopic Approachapproximate
Common questions about 02.91
What is the ICD-10 code for ICD-9 02.91?
- The GEMs map 02.91 to ICD-10-PCS 00N00ZZ, 00N03ZZ, 00N04ZZ, 00N10ZZ, 00N13ZZ and 00N14ZZ.
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.