FY2027
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Excludes1 pair

G25.3 vs G51.4

G25.3 and G51.4 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

The official note, declared on G25.3
facial myokymia (G51.4)
G25.3

Myoclonus

Billable
Chapter 6
Diseases of the nervous system
Section
G20-G26
Use when the record says
  • Drug-induced myoclonus
  • Palatal myoclonus
Indexed under
  • Jerks, myoclonic
  • Myoclonus, myoclonic, myoclonia (familial) (essential) (multifocal) (simplex)
  • Paramyoclonus multiplex
  • Convulsions › myoclonic
  • Myoclonus, myoclonic, myoclonia › drug-induced
G51.4

Facial myokymia

Billable
Chapter 6
Diseases of the nervous system
Section
G50-G59
Indexed under
  • Myokymia, facial

Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027