D84.821 – Immunodeficiency due to drugs
ICD-10-CM 2027 diagnosis code · Certain disorders involving the immune mechanism
ICD-10-CM code
D84.821
- Code
D84.821(claims format:D84821)- Description
- Immunodeficiency due to drugs
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
- Block
- D80-D89 Certain disorders involving the immune mechanism
- Parent codes
- D84 › D84.8 › D84.82
Notes for D84.821
Applicable to:
- Immunodeficiency due to (current or past) medication
Use additional code:
- 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)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block D80-D89
Includes:
- defects in the complement system
- immunodeficiency disorders, except human immunodeficiency virus [HIV] disease
- sarcoidosis
Excludes1 (not coded here):
Excludes2 (not included here):
- human immunodeficiency virus [HIV] disease (B20)
Index terms for D84.821
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in D84.82
Frequently asked questions
What is ICD-10 code D84.821?
D84.821 is the ICD-10-CM code for immunodeficiency due to drugs, in the block D80-D89 (Certain disorders involving the immune mechanism).
Is D84.821 a billable code?
Yes. D84.821 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does D84.821 belong to?
It belongs to category D84 – Other immunodeficiencies.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.