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 | G57.8 | Other specified mononeuropathies of lower limb | not billable |
| intercostal | G58.0 | Intercostal neuropathy | |
| lower limb | G57.9 | Unspecified mononeuropathy of lower limb | not billable |
| multiplex | G58.7 | Mononeuritis multiplex | |
| obturator nerve | G57.8 | Other specified mononeuropathies of lower limb | not billable |
| saphenous nerve | G57.8 | Other specified mononeuropathies of lower limb | not billable |
| specified NEC | G58.8 | Other specified mononeuropathies | |
| tuberculous | A17.83 | Tuberculous neuritis | |
| upper limb | G56.9 | Unspecified mononeuropathy of upper limb | not billable |
Mononeuropathy lower limb
Mononeuropathy upper limb
| specified site NEC | G56.8 | Other specified mononeuropathies of upper limb | not billable |
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