2026 ICD-10-CM Diagnosis Code D84Other immunodeficiencies

ICD-10-CM Codes›D50–D89›D80-D89›D84

ICD-10-CM D84
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D84 is a non-billable ICD-10-CM category code for other immunodeficiencies, so it cannot be submitted on claims. Use a more specific code from this category instead, such as D84.0, D84.1, D84.81, and D84.821.

Code Identity

ICD-10-CM Code
D84
Billable Status
No — Non-Billable Category
Code Describes
Other immunodeficiencies
Chapter
D80-D89
Certain disorders involving the immune mechanism

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
CategoryD84Other immunodeficiencies
This CodeD84Other immunodeficiencies

Specific Coding for Other immunodeficienciesOverview

Non-specific codes like D84 require more characters. Use one of these billable codes instead:

  • Use D84.0 for Lymphocyte function antigen-1 [LFA-1] defect

  • Use D84.1 for Defects in the complement system

  • D84.8 for Other specified immunodeficiencies

  • Use D84.81 for Immunodeficiency due to conditions classified elsewhere

  • D84.82 for Immunodeficiency due to drugs and external causes

  • Use D84.89 for Other immunodeficiencies

  • Use D84.9 for Immunodeficiency, unspecified

Patient EducationClinical

Immune System and Disorders

Your immune system is a complex network of cells, tissues, and organs. Together they help the body fight infections and other diseases.

The full article covers:

  • What is the immune system?
  • What are the parts of the immune system?
  • How does the immune system work?
  • What are the types of immunity?
  • What can go wrong with the immune system?

Read the full article at MedlinePlus

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

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 D84Overview

Is D84 (Other immunodeficiencies) a billable code?

No. This is a category header that groups the codes for other immunodeficiencies, and headers cannot be submitted on claims. Claims for other immunodeficiencies need a more specific code from this category, such as D84.0, D84.1, and D84.81.