P55.9 — Hemolytic disease of newborn, unspecified
Is P55.9 billable?
Yes, but P55.9 is an unspecified code. P55.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, P55.9 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 P55.9 — the more specific alternatives are listed below.
P55.9 at a glance
| Code | P55.9 |
|---|---|
| Description | Hemolytic disease of newborn, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does P55.9 group to?
P55.9 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
How is P55.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to P55.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Erythroblastosis (fetalis) (newborn)
- Disease, diseased › hemolytic
- Isoimmunization NEC › newborn
- Anemia › congenital › due to isoimmunization NOS (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound)
- Anemia › erythroblastic › newborn (essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound)
- Jaundice › newborn › due to or associated with › hemolytic disease (yellow)
- Jaundice › newborn › due to or associated with › incompatibility, maternal/fetal NOS (yellow)
- Jaundice › newborn › due to or associated with › isoimmunization NOS (yellow)
Excludes1 — never code together — inherited from P50-P61
The conditions below can never be reported together with P55.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 16
The conditions below are not part of P55.9, but a patient may have both at the same time. When documentation supports it, P55.9 and the excluded code may both be reported.
How long has P55.9 existed?
P55.9 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.