ICD-10-CM 2027
ICD-10 code for common variable immunodeficiency
Common variable immunodeficiency, unspecified
From the official ICD-10-CM alphabetic index entry “Immunodeficiency › common variable”. Page updated September 29, 2026.
About coding common variable immunodeficiency
The ICD-10-CM code for common variable immunodeficiency is D83.9 (Common variable immunodeficiency, unspecified). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on D83.9.
Within D83, choose D83.9 (unspecified) only when documentation doesn't support a more specific option: with predominant abnormalities of B-cell numbers and function (D83.0), with predominant immunoregulatory T-cell disorders (D83.1), with autoantibodies to B- or T-cells (D83.2) and other common variable immunodeficiencies (D83.8).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific common variable immunodeficiency codes (official index)
- with
- abnormalities of B-cell numbers and function D83.0 — Common variable immunodeficiency with predominant abnormalities of B-cell numbers and function
- autoantibodies to B- or T-cells D83.2 — Common variable immunodeficiency with autoantibodies to B- or T-cells
- immunoregulatory T-cell disorders D83.1 — Common variable immunodeficiency with predominant immunoregulatory T-cell disorders
- specified type NEC D83.8 — Other common variable immunodeficiencies
Common questions about common variable immunodeficiency ICD-10 codes
What is the ICD-10 code for common variable immunodeficiency?
- D83.9 — Common variable immunodeficiency, unspecified. More specific codes apply when the documentation supports them: D83.0, D83.2, D83.1, D83.8.
Is D83.9 billable?
- Yes. D83.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D83.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D83.9 as a principal diagnosis.
Is D83.9 a CC or MCC?
- D83.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.