G71.12 – Myotonia congenita
ICD-10-CM 2027 diagnosis code · Diseases of myoneural junction and muscle
ICD-10-CM code
G71.12
- Code
G71.12(claims format:G7112)- Description
- Myotonia congenita
- Billable
- Yes – valid for HIPAA-covered transactions
- 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 › G71.1
Notes for G71.12
Applicable to:
- Acetazolamide responsive myotonia congenita
- Dominant myotonia congenita [Thomsen disease]
- Myotonia levior
- Recessive myotonia congenita [Becker disease]
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G71 – Primary disorders of muscles
Index terms for G71.12
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G71.1
Frequently asked questions
What is ICD-10 code G71.12?
G71.12 is the ICD-10-CM code for myotonia congenita, in the block G70-G73 (Diseases of myoneural junction and muscle).
Is G71.12 a billable code?
Yes. G71.12 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G71.12 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.