D84.1Billable
Defects in the complement system
- 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] defectYesD84.8Other specified immunodeficienciesD84.81Immunodeficiency due to conditions classified elsewhereYesD84.82Immunodeficiency due to drugs and external causesD84.821Immunodeficiency due to drugsYesD84.822Immunodeficiency due to external causesYesD84.89Other immunodeficienciesYesD84.9Immunodeficiency, unspecifiedYes
Frequently asked questions
What is ICD-10 code D84.1?
D84.1 is an ICD-10-CM diagnosis code for Defects in the complement system.
Is D84.1 a billable code?
Yes. D84.1 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is D84.1 in?
D84.1 falls under Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
When did D84.1 become effective?
D84.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to D84.1?
D84.1 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.