2026 ICD-10-CM Diagnosis Code P56.99Hydrops fetalis due to other hemolytic disease

ICD-10-CM Codes›P00–P96›P50-P61›P56

ICD-10-CM P56.99
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P56.99 is a billable ICD-10-CM diagnosis code for hydrops fetalis due to other hemolytic disease. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hemolytic jaundice and perinatal jaundice.

Code Identity

ICD-10-CM Code
P56.99
Billable Status
Yes — Valid for Submission
Code Describes
Hydrops fetalis due to other hemolytic disease
Short Description
Hydrops fetalis due to other hemolytic disease
Same as the full description in the CMS dataset.
Parent Code
P56.9
Hydrops fetalis due to other and unspecified hemolytic disease

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP50-P61Hemorrhagic and hematological disorders of newborn
CategoryP56Hydrops fetalis due to hemolytic disease
This CodeP56.99Hydrops fetalis due to other hemolytic disease

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Hydrops
      • fetalis
        • due to
          • hemolytic disease
            • specified NEC
    • Hydrops
      • newborn (idiopathic)
        • due to
          • hemolytic disease
            • specified NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PNL007
Hemolytic jaundice and perinatal jaundice
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Edema

Edema means swelling caused by fluid in your body's tissues. It usually occurs in the feet, ankles and legs, but it can involve your entire body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert P56.99 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
773.3 Hydrops fetalis:isoimm
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P56.99Overview

Is P56.99 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report hydrops fetalis due to other hemolytic disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of P56.99?

Under the General Equivalence Mappings, hydrops fetalis due to other hemolytic disease converts to ICD-9-CM 773.3 (hydrops fetalis:isoimm). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.