ICD-10-CM 2027 diagnosis code

P56Hydrops fetalis due to hemolytic disease

Not billable — use a more specific code

P56 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About P56

P56 is the ICD-10-CM diagnosis code for hydrops fetalis due to hemolytic disease. It belongs to block P50-P61 (hemorrhagic and hematological disorders of newborn) and chapter 16 (certain conditions originating in the perinatal period). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: P56.0 (isoimmunization) and P56.9 (disease).

Don't report P56 together with the conditions in its Excludes1 note: hydrops fetalis NOS (P83.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under P56

Coding notes

Excludes1Not coded here — never report together with this code

hydrops fetalis NOS (P83.2)

Notes that apply from higher levels

Instructions written at a parent level also apply to P56.

Broader instructions also apply from P50-P61 Hemorrhagic and hematological disorders of newborn and Chapter 16: Certain conditions originating in the perinatal period.

Codes whose notes reference P56

P83Excludes1

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about P56

Is P56 billable?: No. P56 is a header code. Report one of its more specific subcodes instead.