ICD-10-CM code · FY2027
D84.821 Immunodeficiency due to drugs
BillableValid for claims as a specific diagnosis code
About D84.821
- Code
- D84.821
- Billable
- Yes
- Short description
- Immunodeficiency due to drugs
- Category
- D84 Other immunodeficiencies
- Block
- D80-D89 Certain disorders involving the immune mechanism
- Chapter
- 3 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Code set
- FY2027, October 1, 2026 to September 30, 2027
Ask EvidencePulse about immunodeficiencies
Answers from the published evidence, with every study linked. The question goes into the box; nothing is sent until you press Ask.
Coding notes for D84.821
Applicable to Other names for conditions reported with this code.
- Immunodeficiency due to (current or past) medication
Use additional code Add a second code for the detail named here.
- code for adverse effect if applicable, to identify adverse effect of drug (T36-T50 with fifth or six character 5)
- code, if applicable, for associated long term (current) drug therapy drug or medication such as:
- long term (current) drug therapy systemic steroids (Z79.52)
- other long term (current) drug therapy (Z79.899)
Block D80-D89 notes (apply to every code in it)
Includes Conditions this code covers.
- defects in the complement system
- immunodeficiency disorders, except human immunodeficiency virus [HIV] disease
- sarcoidosis
Excludes1 Not coded here: never report these together with this code (use the code given instead).
Excludes2 Not part of this condition, but a patient can have both: report both codes when both apply.
- human immunodeficiency virus [HIV] disease (B20)
Chapter 3 notes (apply to every code in it)
Excludes2 Not part of this condition, but a patient can have both: report both codes when both apply.
- autoimmune disease (systemic) NOS (M35.9)
- certain conditions originating in the perinatal period (P00-P96)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- human immunodeficiency virus [HIV] disease (B20)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Related codes in D84.82
Latest research on immunodeficiencies
2MM+
Read the research behind every diagnosis
2MM+ gives you every study summary in full, Classics downloads of the landmark trials, EvidencePulse and HypeCheck, and ad-free reading.
See 2MM+ plans