ICD-9-CM procedure code (retired)
04.42 — Other cranial nerve decompression
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 04.42
04.42 is an ICD-9-CM procedure code for other cranial nerve decompression. 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 33 ICD-10-PCS codes, such as 00NF0ZZ (Release Olfactory Nerve, Open Approach), 00NF3ZZ (Release Olfactory Nerve, Percutaneous Approach) and 00NF4ZZ (Release Olfactory Nerve, Percutaneous Endoscopic Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 00NF0ZZRelease Olfactory Nerve, Open Approachapproximate
- 00NF3ZZRelease Olfactory Nerve, Percutaneous Approachapproximate
- 00NF4ZZRelease Olfactory Nerve, Percutaneous Endoscopic Approachapproximate
- 00NG0ZZRelease Optic Nerve, Open Approachapproximate
- 00NG3ZZRelease Optic Nerve, Percutaneous Approachapproximate
- 00NG4ZZRelease Optic Nerve, Percutaneous Endoscopic Approachapproximate
- 00NH0ZZRelease Oculomotor Nerve, Open Approachapproximate
- 00NH3ZZRelease Oculomotor Nerve, Percutaneous Approachapproximate
- 00NH4ZZRelease Oculomotor Nerve, Percutaneous Endoscopic Approachapproximate
- 00NJ0ZZRelease Trochlear Nerve, Open Approachapproximate
- 00NJ3ZZRelease Trochlear Nerve, Percutaneous Approachapproximate
- 00NJ4ZZRelease Trochlear Nerve, Percutaneous Endoscopic Approachapproximate
- 00NL0ZZRelease Abducens Nerve, Open Approachapproximate
- 00NL3ZZRelease Abducens Nerve, Percutaneous Approachapproximate
- 00NL4ZZRelease Abducens Nerve, Percutaneous Endoscopic Approachapproximate
- 00NM0ZZRelease Facial Nerve, Open Approachapproximate
- 00NM3ZZRelease Facial Nerve, Percutaneous Approachapproximate
- 00NM4ZZRelease Facial Nerve, Percutaneous Endoscopic Approachapproximate
- 00NN0ZZRelease Acoustic Nerve, Open Approachapproximate
- 00NN3ZZRelease Acoustic Nerve, Percutaneous Approachapproximate
- 00NN4ZZRelease Acoustic Nerve, Percutaneous Endoscopic Approachapproximate
- 00NP0ZZRelease Glossopharyngeal Nerve, Open Approachapproximate
- 00NP3ZZRelease Glossopharyngeal Nerve, Percutaneous Approachapproximate
- 00NP4ZZRelease Glossopharyngeal Nerve, Percutaneous Endoscopic Approachapproximate
- 00NQ0ZZRelease Vagus Nerve, Open Approachapproximate
- 00NQ3ZZRelease Vagus Nerve, Percutaneous Approachapproximate
- 00NQ4ZZRelease Vagus Nerve, Percutaneous Endoscopic Approachapproximate
- 00NR0ZZRelease Accessory Nerve, Open Approachapproximate
- 00NR3ZZRelease Accessory Nerve, Percutaneous Approachapproximate
- 00NR4ZZRelease Accessory Nerve, Percutaneous Endoscopic Approachapproximate
- 00NS0ZZRelease Hypoglossal Nerve, Open Approachapproximate
- 00NS3ZZRelease Hypoglossal Nerve, Percutaneous Approachapproximate
- 00NS4ZZRelease Hypoglossal Nerve, Percutaneous Endoscopic Approachapproximate
Common questions about 04.42
What is the ICD-10 code for ICD-9 04.42?
- The GEMs map 04.42 to ICD-10-PCS 00NF0ZZ, 00NF3ZZ, 00NF4ZZ, 00NG0ZZ, 00NG3ZZ, 00NG4ZZ and 27 more.
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.