Is P55.1 a billable ICD-10 code?

Yes. P55.1 (ABO isoimmunization of newborn) is billable and can be used for insurance claims. Always verify payer-specific requirements.

P55.1 ✓ Billable

ABO isoimmunization of newborn

Q: What is ICD-10 code P55.1?

ICD-10-CM code P55.1 stands for "ABO isoimmunization of newborn". It is a billable code in the Certain Conditions Originating in the Perinatal Period chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Certain Conditions Originating in the Perinatal Period

Code

P55.1

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Certain Conditions Originating in the Perinatal Period

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code P55.1?

ICD-10-CM code P55.1 represents ABO isoimmunization of newborn. It is a billable diagnosis code in the Certain Conditions Originating in the Perinatal Period chapter, effective October 1, 2025 – September 30, 2026.

Is P55.1 billable?

Yes. P55.1 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is P55.1 in?

P55.1 belongs to the Certain Conditions Originating in the Perinatal Period chapter (P00–P96) of ICD-10-CM.

Related codes in the P55 category

P55 Hemolytic disease of newborn Non-billable P55.0 Rh isoimmunization of newborn Billable P55.8 Other hemolytic diseases of newborn Billable P55.9 Hemolytic disease of newborn, unspecified Billable

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