G71.12

G71.12: Myotonia congenita

Billable / specific codeICD-10-CM

G71.12 is a billable, specific ICD-10-CM code for myotonia congenita. It is valid for submission on a claim.

Check G71.12 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Acetazolamide responsive myotonia congenita
Dominant myotonia congenita [Thomsen disease]
Myotonia levior
Recessive myotonia congenita [Becker disease]

Excludes2 inherited from the categories above G71.12

Not part of this code, but both may be coded when both are present.

Written on G71: Primary disorders of muscles

arthrogryposis multiplex congenita (Q74.3)
metabolic disorders (E70-E88)
myositis (M60.-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G71.12 is named in 16 Medicare coverage policies: 16 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A52494High Frequency Chest Wall Oscillation Devices - Policy Article
A52510Mechanical In-exsufflation Devices - Policy Article
A53052Billing and Coding: Home Health Speech-Language Pathology
A53057Billing and Coding: Home Health Occupational Therapy

Alphabetic index entries that lead here

Thomsen disease
Disease, diseased›Thomsen
Myotonia›congenita(acetazolamide responsive) (dominant) (recessive)
Myotonia›levior
Becker's›disease›myotonia congenita, recessive form
Disease, diseased›Becker›myotonia congenita

Code history

Unchanged in every release from FY2024 to FY2027.