Transient neonatal myasthenia gravis

This code describes a temporary form of muscle weakness in a newborn, caused by the transfer of antibodies from a mother with myasthenia gravis to her fetus. The neonate presents with symptoms such as poor suck, weak cry, respiratory distress, and generalized hypotonia, which typically resolve within a few weeks to months as the maternal antibodies clear from the infant's system.

Use this code for newborns diagnosed with transient myasthenia gravis, confirmed by clinical presentation and a maternal history of myasthenia gravis. Documentation should clearly indicate the neonatal onset of symptoms and the transient nature of the condition, distinguishing it from congenital or juvenile forms of myasthenia gravis.

• Ensure documentation specifies "transient" and "neonatal" to differentiate from other forms of myasthenia gravis.
• Do not code concurrently with G70.0, as this is an Excludes1 note.
• Consider sequencing this code as a principal diagnosis if it is the primary reason for the encounter and treatment.