G70 vs P94.0
G70 and P94.0 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on G70
transient neonatal myasthenia gravis (P94.0)
G70
Myasthenia gravis and other myoneural disorders
Not billable
- Chapter 6
- Diseases of the nervous system
- Section
- G70-G73
P94.0
Transient neonatal myasthenia gravis
Billable
- Chapter 16
- Certain conditions originating in the perinatal period
- Section
- P90-P96
Indexed under
- Myasthenia › gravis › neonatal, transient
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027