2020 ICD-10-CM Diagnosis Code G57.9

Unspecified mononeuropathy of lower limb

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • G57.9 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM G57.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G57.9 - other international versions of ICD-10 G57.9 may differ.
The following code(s) above G57.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G57.9:
  • G00-G99
    2020 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
  • G50-G59
    2020 ICD-10-CM Range G50-G59

    Nerve, nerve root and plexus disorders

    Type 1 Excludes
    • current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
    • neuralgia NOS (M79.2)
    • neuritis NOS (M79.2)
    • peripheral neuritis in pregnancy (O26.82-)
    • radiculitis NOS (M54.1-)
    Nerve, nerve root and plexus disorders
  • G57
    ICD-10-CM Diagnosis Code G57

    Mononeuropathies of lower limb

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • current traumatic nerve disorder - see nerve injury by body region
    Mononeuropathies of lower limb
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to G57.9:
  • Mononeuritis G58.9
    ICD-10-CM Diagnosis Code G58.9

    Mononeuropathy, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
  • Mononeuropathy G58.9
    ICD-10-CM Diagnosis Code G58.9

    Mononeuropathy, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
  • Neuritis (rheumatoid) M79.2
    ICD-10-CM Diagnosis Code M79.2

    Neuralgia and neuritis, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Type 1 Excludes
    • ilioinguinal G57.9- (nerve)
  • Neuroma - see also Neoplasm, nerve, benign
    • nonneoplastic
      • leg G57.9-
      • lower extremity G57.9-
    • surgical (nonneoplastic)
      • leg G57.9-
      • lower extremity G57.9-
  • Neuropathy, neuropathic G62.9
    ICD-10-CM Diagnosis Code G62.9

    Polyneuropathy, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Neuropathy NOS
    • leg NEC G57.9-
    • lower extremity G57.9-
  • Paralysis, paralytic (complete) (incomplete) G83.9
    ICD-10-CM Diagnosis Code G83.9

    Paralytic syndrome, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    • compression
      • leg G57.9-
      • lower extremity G57.9-
    • abductor, lower extremity G57.9-
    • ankle G57.9-
    • quadriceps G57.9-
    • thigh G57.9-

ICD-10-CM Codes Adjacent To G57.9
G57.7 Causalgia of lower limb
G57.70 Causalgia of unspecified lower limb
G57.71 Causalgia of right lower limb
G57.72 Causalgia of left lower limb
G57.73 Causalgia of bilateral lower limbs
G57.8 Other specified mononeuropathies of lower limb
G57.80 Other specified mononeuropathies of unspecified lower limb
G57.81 Other specified mononeuropathies of right lower limb
G57.82 Other specified mononeuropathies of left lower limb
G57.83 Other specified mononeuropathies of bilateral lower limbs
G57.9 Unspecified mononeuropathy of lower limb
G57.90 Unspecified mononeuropathy of unspecified lower limb
G57.91 Unspecified mononeuropathy of right lower limb
G57.92 Unspecified mononeuropathy of left lower limb
G57.93 Unspecified mononeuropathy of bilateral lower limbs
G58 Other mononeuropathies
G58.0 Intercostal neuropathy
G58.7 Mononeuritis multiplex
G58.8 Other specified mononeuropathies
G58.9 Mononeuropathy, unspecified
G59 Mononeuropathy in diseases classified elsewhere

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.