P77.9 — Necrotizing enterocolitis in newborn, unspecified
Is P77.9 billable?
Yes, but P77.9 is an unspecified code. P77.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, P77.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting P77.9 — the more specific alternatives are listed below.
P77.9 at a glance
| Code | P77.9 |
|---|---|
| Description | Necrotizing enterocolitis in newborn, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does P77.9 group to?
P77.9 sits in MDC 15 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 791Prematurity with Major Problemsmedical
As a secondary diagnosis, P77.9 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is P77.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to P77.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Enterocolitis › necrotizing › in newborn
Inclusion terms
Alternative wording in documentation that is classified to P77.9.
- Necrotizing enterocolitis in newborn, NOS
Excludes2 — not included here — inherited from Chapter 16
The conditions below are not part of P77.9, but a patient may have both at the same time. When documentation supports it, P77.9 and the excluded code may both be reported.
How long has P77.9 existed?
P77.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.