2020 ICD-10-CM Diagnosis Code G51.9

Disorder of facial nerve, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G51.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM G51.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G51.9 - other international versions of ICD-10 G51.9 may differ.
The following code(s) above G51.9 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 G51.9:
  • 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
  • G51
    ICD-10-CM Diagnosis Code G51

    Facial nerve disorders

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • disorders of 7th cranial nerve
    Facial nerve disorders
Approximate Synonyms
  • Facial nerve disorder
  • Facial neuralgia
  • Left facial nerve disorder
  • Neuralgia, facial
  • Right facial nerve disorder
Clinical Information
  • A disorder characterized by involvement of the facial nerve (seventh cranial nerve).
  • A non-neoplastic or neoplastic disorder affecting the facial nerve (seventh cranial nerve).
  • Diseases of the facial nerve or nuclei. Pontine disorders may affect the facial nuclei or nerve fascicle. The nerve may be involved intracranially, along its course through the petrous portion of the temporal bone, or along its extracranial course. Clinical manifestations include facial muscle weakness, loss of taste from the anterior tongue, hyperacusis, and decreased lacrimation.
ICD-10-CM G51.9 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 073 Cranial and peripheral nerve disorders with mcc
  • 074 Cranial and peripheral nerve disorders without mcc

Convert G51.9 to ICD-9-CM

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 G51.9:

ICD-10-CM Codes Adjacent To G51.9
G51.0 Bell's palsy
G51.1 Geniculate ganglionitis
G51.2 Melkersson's syndrome
G51.3 Clonic hemifacial spasm
G51.31 …… right
G51.32 …… left
G51.33 …… bilateral
G51.39 …… unspecified
G51.4 Facial myokymia
G51.8 Other disorders of facial nerve
G51.9 Disorder of facial nerve, unspecified
G52 Disorders of other cranial nerves
G52.0 Disorders of olfactory nerve
G52.1 Disorders of glossopharyngeal nerve
G52.2 Disorders of vagus nerve
G52.3 Disorders of hypoglossal nerve
G52.7 Disorders of multiple cranial nerves
G52.8 Disorders of other specified cranial nerves
G52.9 Cranial nerve disorder, unspecified
G53 Cranial nerve disorders in diseases classified elsewhere
G54 Nerve root and plexus disorders

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