G70.2 Congenital and developmental myasthenia

Billable ICD-10-CM code, FY2026.

Applies from G70 Myasthenia gravis and other myoneural disorders

Excludes1 (never code together)

• botulism (A05.1, A48.51-A48.52)
• transient neonatal myasthenia gravis (P94.0)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 196 — Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders
• CMS-HCC V22: HCC 75 — Myasthenia Gravis/Myoneural Disorders, Inflammatory and Toxic Neuropathy
• RxHCC V08: HCC 153 — Myasthenia Gravis and Other Myoneural Disorders
• ESRD V24: HCC 75

MS-DRG index

Defines the logic of DRG(s) 073-074 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 358.8 Other specified myoneural disorders (approximate)

Diagnosis Index entries for G70.2

• Amyotonia › congenita
• Myasthenia › congenital
• Myasthenia › developmental
• Oppenheim's disease

Nearby codes

• G70 Myasthenia gravis and other myoneural disorders
• G70.0 Myasthenia gravis
• G70.00 Myasthenia gravis without (acute) exacerbation
• G70.01 Myasthenia gravis with (acute) exacerbation
• G70.1 Toxic myoneural disorders
• G70.2 Congenital and developmental myasthenia (this code)
• G70.8 Other specified myoneural disorders
• G70.80 Lambert-Eaton syndrome, unspecified
• G70.81 Lambert-Eaton syndrome in disease classified elsewhere
• G70.89 Other specified myoneural disorders
• G70.9 Myoneural disorder, unspecified