Excludes1 pair
P56- vs P83.2
P56 and P83.2 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on P56
hydrops fetalis NOS (P83.2)
P56
Hydrops fetalis due to hemolytic disease
Not billable
- Chapter 16
- Certain conditions originating in the perinatal period
- Section
- P50-P61
P83.2
Hydrops fetalis not due to hemolytic disease
Billable
- Chapter 16
- Certain conditions originating in the perinatal period
- Section
- P80-P83
Use when the record says
- Hydrops fetalis NOS
Indexed under
- Anasarca › newborn
- Hydrops › fetalis
- Hydrops › newborn (idiopathic)
- Hydrops › fetalis › due to › other specified nonhemolytic disease NEC
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