G25.3 vs G51.4
G25.3 and G51.4 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
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 (idiopathic)
- Myoclonus, myoclonic, myoclonia › drug-induced (familial) (essential) (multifocal) (simplex)
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