P56 ICD-10-CM Code: Hydrops fetalis due to hemolytic disease
P56 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Certain conditions originating in the perinatal period (P00-P96) / Hemorrhagic and hematological disorders of newborn (P50-P61)
P56
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceHydrops fetalis due to hemolytic disease
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for P56. Check the code and parent instructions in the Code Book.
Excludes 2
Official- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from P00-P96
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from P00-P96
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from P00-P96
- neoplasms (C00-D49)Inherited from P00-P96
- tetanus neonatorum (A33)Inherited from P00-P96
Related Codes
Includes
Official- conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs laterInherited from P00-P96
Excludes 1
Official- hydrops fetalis NOS (P83.2)
- congenital stenosis and stricture of bile ducts (Q44.3)Inherited from P50-P61
- Crigler-Najjar syndrome (E80.5)Inherited from P50-P61
- Dubin-Johnson syndrome (E80.6)Inherited from P50-P61
- Gilbert syndrome (E80.4)Inherited from P50-P61
- hereditary hemolytic anemias (D55-D58)Inherited from P50-P61
Code First
OfficialNo Code First sequencing instructions are included in this display for P56. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for P56. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for P56. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- P56
- Description
- Hydrops fetalis due to hemolytic disease
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
P56 is the ICD-10-CM diagnosis code for hydrops fetalis due to hemolytic disease. P56 sits in the ICD-10-CM chapter for certain conditions originating in the perinatal period (p00-p96), within the section covering hemorrhagic and hematological disorders of newborn (p50-p61).
Header codes like P56 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for P56 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Excludes 1, Do NOT code together
- hydrops fetalis NOS (P83.2)