ICD-10 Code for Mononeuropathy
The ICD-10-CM code for mononeuropathy is G58.9 — Mononeuropathy, unspecified. This is the code the Alphabetic Index gives for mononeuropathy with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
G58.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which mononeuropathy code should you use?
The Alphabetic Index lists 10 codes under Mononeuropathy. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| ilioinguinal nerve | G57.8Not billable | Other specified mononeuropathies of lower limb |
| intercostal | G58.0 | Intercostal neuropathy |
| lower limb | G57.9Not billable | Unspecified mononeuropathy of lower limb |
| multiplex | G58.7 | Mononeuritis multiplex |
| obturator nerve | G57.8Not billable | Other specified mononeuropathies of lower limb |
| saphenous nerve | G57.8Not billable | Other specified mononeuropathies of lower limb |
| specified NEC | G58.8 | Other specified mononeuropathies |
| tuberculous | A17.83 | Tuberculous neuritis |
| upper limb | G56.9Not billable | Unspecified mononeuropathy of upper limb |
Mononeuropathy lower limb
Mononeuropathy upper limb
| specified site NEC | G56.8Not billable | Other specified mononeuropathies of upper limb |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources