D84.821Billable
Immunodeficiency due to drugs
- Chapter
- 3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Category
- D84
- Effective date
- October 1, 2026
Related codes in category D84
D84Other immunodeficienciesD84.0Lymphocyte function antigen-1 [LFA-1] defectYesD84.1Defects in the complement systemYesD84.8Other specified immunodeficienciesD84.81Immunodeficiency due to conditions classified elsewhereYesD84.82Immunodeficiency due to drugs and external causesD84.822Immunodeficiency due to external causesYesD84.89Other immunodeficienciesYesD84.9Immunodeficiency, unspecifiedYes
Frequently asked questions
What is ICD-10 code D84.821?
D84.821 is an ICD-10-CM diagnosis code for Immunodeficiency due to drugs.
Is D84.821 a billable code?
Yes. D84.821 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is D84.821 in?
D84.821 falls under Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
When did D84.821 become effective?
D84.821 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to D84.821?
D84.821 belongs to category D84, which includes 9 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.