D84.821 Immunodeficiency due to drugs

The ICD-10-CM code for Immunodeficiency due to drugs is D84.821 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)

Section

D80-D89: Certain disorders involving the immune mechanism (D80-D89)

Category D84

10 codes (7 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to D84.821:

• Immunodeficiency › due to › drugs
• Immunodeficiency › due to › medication (current or past)

Inclusion Terms

• Immunodeficiency due to (current or past) medication

U.S. Hospital Utilization

• An estimated 293,020 U.S. inpatient stays in 2023 included D84.821 among the documented diagnoses.
• 180 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 3 TOC entry

3. Chapter 3: Disease of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) ............................................................................................. 39

Reserved for future guideline expansion

Reserved for future guideline expansion ...................................................................................... 39

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)