ICD-10-CM 2027
ICD-10 code for mononeuropathy
From the official ICD-10-CM alphabetic index entry “Mononeuropathy”. Page updated September 29, 2026.
About coding mononeuropathy
The ICD-10-CM code for mononeuropathy is G58.9 (Mononeuropathy, unspecified). The official index lists 12 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G58.9.
Within G58, choose G58.9 (Mononeuropathy, unspecified) only when documentation doesn't support a more specific option: intercostal neuropathy (G58.0), mononeuritis multiplex (G58.7) and other specified mononeuropathies (G58.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific mononeuropathy codes (official index)
- carpal tunnel syndrome
- diabetic NEC
- femoral nerve
- ilioinguinal nerve G57.8 — Other specified mononeuropathies of lower limb
- in diseases classified elsewhere
- intercostal G58.0 — Intercostal neuropathy
- lower limb G57.9 — Unspecified mononeuropathy of lower limb
- causalgia
- femoral nerve
- meralgia paresthetica G57.1 — Meralgia paresthetica
- plantar nerve
- popliteal nerve
- sciatic nerve
- specified NEC G57.8 — Other specified mononeuropathies of lower limb
- tarsal tunnel syndrome
- median nerve
- multiplex G58.7 — Mononeuritis multiplex
- obturator nerve G57.8 — Other specified mononeuropathies of lower limb
- popliteal nerve
- radial nerve
- saphenous nerve G57.8 — Other specified mononeuropathies of lower limb
- specified NEC G58.8 — Other specified mononeuropathies
- tarsal tunnel syndrome
- tuberculous A17.83 — Tuberculous neuritis
- ulnar nerve
- upper limb G56.9 — Unspecified mononeuropathy of upper limb
- carpal tunnel syndrome
- causalgia
- median nerve
- radial nerve
- specified site NEC G56.8 — Other specified mononeuropathies of upper limb
- ulnar nerve
Common questions about mononeuropathy ICD-10 codes
What is the ICD-10 code for mononeuropathy?
- G58.9 — Mononeuropathy, unspecified. More specific codes apply when the documentation supports them: G57.8, G58.0, G57.9, G57.1 and others below.
What is the ICD-10 code for ilioinguinal nerve mononeuropathy?
- G57.8 — Other specified mononeuropathies of lower limb (header code; choose a more specific subcode).
What is the ICD-10 code for intercostal mononeuropathy?
- G58.0 — Intercostal neuropathy.
What is the ICD-10 code for lower limb mononeuropathy?
- G57.9 — Unspecified mononeuropathy of lower limb (header code; choose a more specific subcode).
What is the ICD-10 code for multiplex mononeuropathy?
- G58.7 — Mononeuritis multiplex.
What is the ICD-10 code for obturator nerve mononeuropathy?
- G57.8 — Other specified mononeuropathies of lower limb (header code; choose a more specific subcode).
What is the ICD-10 code for saphenous nerve mononeuropathy?
- G57.8 — Other specified mononeuropathies of lower limb (header code; choose a more specific subcode).
Is G58.9 billable?
- Yes. G58.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G58.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G58.9 as a principal diagnosis.
Is G58.9 a CC or MCC?
- No. G58.9 is neither a CC nor an MCC under MS-DRG v44.0.