DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

G51 Facial nerve disorders

  • Header · not billable

G51 is not billable. The category heads 10 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Myokymia, facial → G51.4
  • Paraspasmus facialis → G51.8
  • Parry-Romberg syndrome → G51.8

Where it sits

  1. Chapter 6 Diseases of the nervous system (G00-G99)
  2. G50-G59 Nerve, nerve root and plexus disorders (G50-G59)
  3. G51 Facial nerve disorders
Billable codes
10
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
33

Codes in G51

  1. G51.0
    Bell's palsy
    Billable
    Inclusion terms 1

    Inclusion terms

    • Facial palsy
  2. G51.1
    Geniculate ganglionitis
    Billable
    Excludes1 1

    Excludes1

    • postherpetic geniculate ganglionitis (B02.21) B02.21
  3. G51.2
    Melkersson's syndrome
    Billable
    Inclusion terms 1

    Inclusion terms

    • Melkersson-Rosenthal syndrome
  4. G51.3
    Clonic hemifacial spasm
    Header
  5. G51.31
    Clonic hemifacial spasm, right
    Billable
  6. G51.32
    Clonic hemifacial spasm, left
    Billable
  7. G51.33
    Clonic hemifacial spasm, bilateral
    Billable
  8. G51.39
    Clonic hemifacial spasm, unspecified
    Billable
  9. G51.4
    Facial myokymia
    Billable
  10. G51.8
    Other disorders of facial nerve
    Billable
  11. G51.9
    Disorder of facial nerve, unspecified
    Billable

Sources of each column.

Instructions

At G51

Includes

  • disorders of 7th cranial nerve

Notes that also apply

Block G50-G59 instructions (Excludes1 5): printed on the block page.

Chapter 6 instructions (Excludes2 8): printed on the chapter 6 page.

Index entries

  • Melkersson (-Rosenthal) syndrome → G51.2
  • Myokymia, facial → G51.4
  • Paraspasmus facialis → G51.8
  • Parry-Romberg syndrome → G51.8
  • Romberg's disease or syndrome → G51.8
  • Bell'spalsy, paralysis → G51.0
  • Diplegia (upper limbs)facial → G51.0
  • Palsyfacial → G51.0
  • Paralysis, paralytic (complete) (incomplete)Bell's → G51.0
  • Paralysis, paralytic (complete) (incomplete)facial (nerve) → G51.0
  • Ganglionitisgeniculate → G51.1
  • Neuralgia, neuralgic (acute)facialis vera → G51.1
  • Neuritis (rheumatoid)geniculate ganglion → G51.1
  • Bell'sspasm → G51.3-
  • Myoclonus, myoclonic, myoclonia (familial) (essential) (multifocal) (simplex)facial → G51.3-
  • Spasm(s), spastic, spasticityBell's → G51.3-
  • Spasm(s), spastic, spasticityfacial → G51.3-
  • Spasm(s), spastic, spasticityhemifacial (clonic) → G51.3-
  • Hemiatrophyface, facial, progressive (Romberg) → G51.8
  • Lesion(s) (nontraumatic)chorda tympani → G51.8
  • Neuritis (rheumatoid)facial → G51.8
  • Disease, diseasedfacial nerve (seventh) → G51.9
  • Neuropathy, neuropathicfacial nerve → G51.9
  • Paralysis, paralytic (complete) (incomplete)nervefacial → G51.0
  • Paralysis, paralytic (complete) (incomplete)nerveseventh or facial → G51.0
  • Syndromeganglion (basal ganglia brain)geniculi → G51.1
  • Atrophy, atrophic (of)hemifacialRomberg → G51.8
  • Compressioncranial nerveseventh → G51.8
  • Neuritis (rheumatoid)cranial nerveseventh or facial → G51.8
  • Disorder (of)nervefacial → G51.9
  • Lesion(s) (nontraumatic)cranial nerveseventh → G51.9
  • Disorder (of)nervecranialseventh NEC → G51.8
  • Disorder (of)nervefacialspecified NEC → G51.8

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy