2026 ICD-10-CM Diagnosis Code D81.32Adenosine deaminase 2 deficiency

ICD-10-CM Codes›D50–D89›D80-D89›D81

ICD-10-CM D81.32
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D81.32 is a billable ICD-10-CM diagnosis code for adenosine deaminase 2 deficiency. 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 Immunity disorders and Other specified and unspecified nutritional and metabolic disorders.

Code Identity

ICD-10-CM Code
D81.32
Billable Status
Yes — Valid for Submission
Code Describes
Adenosine deaminase 2 deficiency
Short Description
Adenosine deaminase 2 deficiency
Same as the full description in the CMS dataset.
Parent Code
D81.3
Adenosine deaminase [ADA] deficiency

Code Classification

ChapterD50–D89Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
SectionD80-D89Certain disorders involving the immune mechanism
CategoryD81Combined immunodeficiencies
This CodeD81.32Adenosine deaminase 2 deficiency

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adenosine deaminase 2 deficiency
  • Adenosine deaminase deficiency
  • Vasculitis due to adenosine deaminase 2 deficiency

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • ADA2 deficiency
  • Adenosine deaminase deficiency type 2

Code Also

  • , if applicable, any associated manifestations, such as:
  • polyarteritis nodosa M30.0
  • stroke I63

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.

    • Deficiency, deficient
      • ADA2 (adenosine deaminase 2)
    • Deficiency, deficient
      • adenosine deaminase (ADA)
        • type 2

Clinical ClassificationClinical

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

CCSR BLD008
Immunity disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR END016
Other specified and unspecified nutritional and metabolic disorders
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Adenosine deaminase 2 deficiency

Adenosine deaminase 2 (ADA2) deficiency is a disorder characterized by abnormal inflammation of various tissues. Signs and symptoms can begin anytime from early childhood to adulthood. The severity of the disorder also varies, even among affected individuals in the same family.

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement D81.32 replaces the following previously assigned code(s):

  • D81.3 - Adenosine deaminase [ADA] deficiency
FY 2020AddedAdded to the ICD-10-CM code setEffective October 1, 2019.
FY 2021–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D81.32Overview

Is D81.32 (Adenosine deaminase [ADA] deficiency) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report adenosine deaminase 2 deficiency on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.