P55.1Billable

ABO isoimmunization of newborn

Chapter
16. Certain conditions originating in the perinatal period
Category
P55
Effective date
October 1, 2026

Related codes in category P55

P55Hemolytic disease of newbornP55.0Rh isoimmunization of newbornYesP55.8Other hemolytic diseases of newbornYesP55.9Hemolytic disease of newborn, unspecifiedYes

Frequently asked questions

What is ICD-10 code P55.1?

P55.1 is an ICD-10-CM diagnosis code for ABO isoimmunization of newborn.

Is P55.1 a billable code?

Yes. P55.1 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is P55.1 in?

P55.1 falls under Chapter 16: Certain conditions originating in the perinatal period.

When did P55.1 become effective?

P55.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to P55.1?

P55.1 belongs to category P55, which includes 4 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.