ICD-10-CM 2027
ICD-10 code for Levior myotonia
From the official ICD-10-CM alphabetic index entry “Myotonia (acquisita) (intermittens) › levior”. Page updated September 29, 2026.
About coding Levior myotonia
The ICD-10-CM code for Levior myotonia is G71.12 (Myotonia congenita).
Within G71.1 (myotonic disorders), G71.12 is specifically for myotonia congenita. Related codes cover myotonic muscular dystrophy (G71.11), myotonic chondrodystrophy (G71.13), drug induced myotonia (G71.14) and other specified myotonic disorders (G71.19).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 091 (Other Disorders of Nervous System with MCC, relative weight 1.7046), DRG 092 (Other Disorders of Nervous System with CC, relative weight 1.0239) and DRG 093 (Other Disorders of Nervous System without CC/MCC, relative weight 0.7783), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Levior myotonia ICD-10 codes
What is the ICD-10 code for Levior myotonia?
- G71.12 — Myotonia congenita.
Is G71.12 billable?
- Yes. G71.12 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G71.12 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G71.12 as a principal diagnosis.
Is G71.12 a CC or MCC?
- No. G71.12 is neither a CC nor an MCC under MS-DRG v44.0.