K55.05 vs P77
K55.05 (Acute (reversible) ischemia of intestine, part unspecified) compared with P77 (Necrotizing enterocolitis of newborn), 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. K55.05 carries an Excludes1 note covering P77: “necrotizing enterocolitis of newborn (P77.-)”
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
| K55.05Acute (reversible) ischemia of intestine, part unspecified | P77Necrotizing enterocolitis of newborn | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96) |
| Definition | Acute (reversible) ischemia of intestine, part unspecified is a non-billable ICD-10-CM category code (K55.05). | Necrotizing enterocolitis of newborn is a non-billable ICD-10-CM category code (P77). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources