E84.9 vs P78
E84.9 (Cystic fibrosis, unspecified) compared with P78 (Other perinatal digestive system disorders), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. P78 carries an Excludes1 note covering E84.9: “cystic fibrosis (E84.0-E84.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| E84.9Cystic fibrosis, unspecified | P78Other perinatal digestive system disorders | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96) |
| Definition | Cystic fibrosis, unspecified is a billable ICD-10-CM diagnosis code (E84.9). | Other perinatal digestive system disorders is a non-billable ICD-10-CM category code (P78). |
| Includes | mucoviscidosis | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources