G57.9 – Unspecified mononeuropathy of lower limb
ICD-10-CM 2027 diagnosis code · Nerve, nerve root and plexus disorders
- Code
G57.9(claims format:G579)- Description
- Unspecified mononeuropathy of lower limb
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G50-G59 Nerve, nerve root and plexus disorders
- Parent codes
- G57
Billable codes under G57.9
G57.9 is a header code and cannot be used on claims. Choose the most specific code:
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G57 – Mononeuropathies of lower limb
- current traumatic nerve disorder - see nerve injury by body region
Block G50-G59
Index terms for G57.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Neuritis, ilioinguinal
- Neuroma, surgical, leg
- Mononeuritis, lower limb
- Mononeuropathy, lower limb
- Neuroma, nonneoplastic, leg
- Paralysis, paralytic, ankle
- Paralysis, paralytic, thigh
- Neuropathy, neuropathic, leg NEC
- Paralysis, paralytic, quadriceps
- Neuroma, surgical, lower extremity
- Paralysis, paralytic, compression, leg
- Neuroma, nonneoplastic, lower extremity
- Neuropathy, neuropathic, lower extremity
- Paralysis, paralytic, abductor, lower extremity
- Paralysis, paralytic, compression, lower extremity
Related codes in G57
- G57.0 – Lesion of sciatic nerveHeader
- G57.1 – Meralgia parestheticaHeader
- G57.2 – Lesion of femoral nerveHeader
- G57.3 – Lesion of lateral popliteal nerveHeader
- G57.4 – Lesion of medial popliteal nerveHeader
- G57.5 – Tarsal tunnel syndromeHeader
- G57.6 – Lesion of plantar nerveHeader
- G57.7 – Causalgia of lower limbHeader
- G57.8 – Other specified mononeuropathies of lower limbHeader
Frequently asked questions
What is ICD-10 code G57.9?
G57.9 is the ICD-10-CM code for unspecified mononeuropathy of lower limb, in the block G50-G59 (Nerve, nerve root and plexus disorders).
Is G57.9 a billable code?
No. G57.9 is a header code with more specific child codes; report one of the billable codes listed above.
What category does G57.9 belong to?
It belongs to category G57 – Mononeuropathies of lower limb.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.