ICD-10-CM 2027
ICD-10 code for mononeuritis
From the official ICD-10-CM alphabetic index entry “Mononeuritis”. Page updated September 29, 2026.
About coding mononeuritis
The ICD-10-CM code for mononeuritis is G58.9 (Mononeuropathy, unspecified). The official index lists 17 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 mononeuritis codes (official index)
- cranial nerve
- femoral nerve G57.2 — Lesion of femoral nerve
- lateral
- cutaneous nerve of thigh G57.1 — Meralgia paresthetica
- popliteal nerve G57.3 — Lesion of lateral popliteal nerve
- lower limb G57.9 — Unspecified mononeuropathy of lower limb
- specified nerve NEC G57.8 — Other specified mononeuropathies of lower limb
- medial popliteal nerve G57.4 — Lesion of medial popliteal nerve
- median nerve G56.1 — Other lesions of median nerve
- multiplex G58.7 — Mononeuritis multiplex
- plantar nerve G57.6 — Lesion of plantar nerve
- posterior tibial nerve G57.5 — Tarsal tunnel syndrome
- radial nerve G56.3 — Lesion of radial nerve
- sciatic nerve G57.0 — Lesion of sciatic nerve
- specified NEC G58.8 — Other specified mononeuropathies
- tibial nerve G57.4 — Lesion of medial popliteal nerve
- ulnar nerve G56.2 — Lesion of ulnar nerve
- upper limb G56.9 — Unspecified mononeuropathy of upper limb
- specified nerve NEC G56.8 — Other specified mononeuropathies of upper limb
- vestibular
Common questions about mononeuritis ICD-10 codes
What is the ICD-10 code for mononeuritis?
- G58.9 — Mononeuropathy, unspecified. More specific codes apply when the documentation supports them: G57.2, G57.1, G57.3, G57.9 and others below.
What is the ICD-10 code for femoral nerve mononeuritis?
- G57.2 — Lesion of femoral nerve (header code; choose a more specific subcode).
What is the ICD-10 code for lower limb mononeuritis?
- G57.9 — Unspecified mononeuropathy of lower limb (header code; choose a more specific subcode).
What is the ICD-10 code for medial popliteal nerve mononeuritis?
- G57.4 — Lesion of medial popliteal nerve (header code; choose a more specific subcode).
What is the ICD-10 code for median nerve mononeuritis?
- G56.1 — Other lesions of median nerve (header code; choose a more specific subcode).
What is the ICD-10 code for multiplex mononeuritis?
- G58.7 — Mononeuritis multiplex.
What is the ICD-10 code for plantar nerve mononeuritis?
- G57.6 — Lesion of plantar nerve (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.