G71.1 – Myotonic disorders

ICD-10-CM 2027 diagnosis code · Diseases of myoneural junction and muscle

Non-billable header

ICD-10-CM code G71.1

Code: G71.1 (claims format: G711)
Description: Myotonic disorders
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 6. Diseases of the nervous system (G00-G99)
Block: G70-G73 Diseases of myoneural junction and muscle
Parent codes: G71

Billable codes under G71.1

G71.1 is a header code and cannot be used on claims. Choose the most specific code:

G71.11 – Myotonic muscular dystrophyBillable
G71.12 – Myotonia congenitaBillable
G71.13 – Myotonic chondrodystrophyBillable
G71.14 – Drug induced myotoniaBillable
G71.19 – Other specified myotonic disordersBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G71 – Primary disorders of muscles

Excludes2 (not included here):

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

Related codes in G71

G71.0 – Muscular dystrophyHeader
G71.2 – Congenital myopathiesHeader
G71.3 – Mitochondrial myopathy, not elsewhere classifiedBillable
G71.8 – Other primary disorders of musclesBillable
G71.9 – Primary disorder of muscle, unspecifiedBillable

Frequently asked questions

What is ICD-10 code G71.1?

G71.1 is the ICD-10-CM code for myotonic disorders, in the block G70-G73 (Diseases of myoneural junction and muscle).

Is G71.1 a billable code?

No. G71.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does G71.1 belong to?

It belongs to category G71 – Primary disorders of muscles.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.