D83.9 — Common variable immunodeficiency, unspecified
D83.9 is a billable, specific ICD-10-CM code for common variable immunodeficiency, unspecified. It is valid for submission on a claim.
Risk adjustment
D83.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 114 Common Variable and Combined Immunodeficiencies2.262 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
D83.9 is named in 26 Medicare coverage policies — 26 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52507External Infusion Pumps - Policy Article
- A52509Intravenous Immune Globulin - Policy Article
- A54660Billing and Coding: Coverage of Intravenous Immune Globulin for Treatment of Primary Immune Deficiency Diseases in the Home – Medicare Benefit Policy Manual, Chapter 15, 50.6
- A55717Billing and Coding: Lab: Flow Cytometry
How D83.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D83.9.
- Immunodeficiency›common variable
Related codes at this level
Codes that share D83. If D83.9 is not quite right, the correct code is usually one of these.
- D83.0Common variable immunodeficiency with predominant abnormalities of B-cell numbers and function
- D83.1Common variable immunodeficiency with predominant immunoregulatory T-cell disorders
- D83.2Common variable immunodeficiency with autoantibodies to B- or T-cells
- D83.8Other common variable immunodeficiencies
Questions about D83.9
- Is D83.9 a billable ICD-10-CM code?
- Yes. D83.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D83.9 sit in the tabular list?
- Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Certain disorders involving the immune mechanism (D80-D89).