ICD-10-CM 2027
ICD-10 code for lower limb mononeuritis
From the official ICD-10-CM alphabetic index entry “Mononeuritis › lower limb”. Page updated September 29, 2026.
About coding lower limb mononeuritis
The ICD-10-CM code for lower limb mononeuritis is G57.9 (Unspecified mononeuropathy of lower limb). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G57.9.
Within G57, choose G57.9 (Unspecified mononeuropathy of lower limb) only when documentation doesn't support a more specific option: lesion of sciatic nerve (G57.0), Meralgia paresthetica (G57.1), lesion of femoral nerve (G57.2), lesion of lateral popliteal nerve (G57.3), lesion of medial popliteal nerve (G57.4), tarsal tunnel syndrome (G57.5), lesion of plantar nerve (G57.6), Causalgia of lower limb (G57.7) and 1 more.
To report this condition, pick the subcode that matches the documentation: G57.90 (limb), G57.91 (limb), G57.92 (limb) and G57.93 (limbs).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific lower limb mononeuritis codes (official index)
- specified nerve NEC G57.8 — Other specified mononeuropathies of lower limb
Common questions about lower limb mononeuritis ICD-10 codes
What is the ICD-10 code for lower limb mononeuritis?
- G57.9 — Unspecified mononeuropathy of lower limb (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: G57.8.
Is G57.9 billable?
- No. G57.9 is a header code. Report one of its more specific subcodes instead.