G70.2

Billable

Congenital and developmental myasthenia

HCC Category Mapping

V28HCC 196 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre

0.402

V24HCC 75 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome

0.425

ESRDHCC 75 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome

0.000

RxHCCHCC 153 — Myasthenia Gravis/Myoneural Conditions

0.000

What This Code Means

Myasthenia gravis that is present from birth or develops during early childhood due to genetic or developmental factors.

Coding Tips

•This code is used for congenital forms and neonatal myasthenia gravis
•Distinguish from autoimmune myasthenia gravis (G70.00/G70.01) which typically develops later in life

Clinical Significance

Congenital and developmental myasthenia is a group of inherited disorders affecting neuromuscular transmission present from birth or early childhood, distinct from autoimmune myasthenia gravis. These patients require lifelong management and monitoring for respiratory and bulbar complications. Accurate coding distinguishes genetic from autoimmune forms, which is critical for appropriate treatment planning and risk adjustment.

Documentation Requirements

✓Age of onset: neonatal or early childhood presentation
✓Genetic testing results identifying specific congenital myasthenic syndrome subtype when available
✓Family history supporting congenital/genetic origin
✓Clinical features: ptosis, feeding difficulties, hypotonia, delayed motor milestones
✓Distinction from autoimmune myasthenia gravis: negative acetylcholine receptor antibodies
✓Current treatment and management plan

Commonly Confused Codes

G70.00/G70.01 — Autoimmune myasthenia gravis typically develops later in life and has positive antibodies; congenital forms are antibody-negative P94.0 — Transient neonatal myasthenia gravis is a temporary condition in newborns of myasthenic mothers, not a congenital myasthenic syndrome G70.80 — Lambert-Eaton syndrome is acquired, not congenital G71.00 — Muscular dystrophy, unspecified involves muscle fiber disease, not neuromuscular junction defects

Code Hierarchy

└G70Myasthenia gravis and other myoneural disorders └G70.2Congenital and developmental myasthenia

└G70.2Congenital and developmental myasthenia