G70.01Myasthenia gravis with (acute) exacerbation

G70.01 is the ICD-10-CM diagnosis code for myasthenia gravis with (acute) exacerbation. It belongs to category G70 (myasthenia gravis and other myoneural disorders), block G70-G73 (diseases of myoneural junction and muscle) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within G70.0 (myasthenia gravis), G70.01 is specifically for myasthenia gravis with (acute) exacerbation. Related codes cover without (acute) exacerbation (G70.00).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 056 (Degenerative Nervous System Disorders with MCC, relative weight 2.2655) and DRG 057 (Degenerative Nervous System Disorders without MCC, relative weight 1.2838), 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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 358.01 (myasthenia gravis with (acute) exacerbation).