D80.9 — Immunodeficiency with predominantly antibody defects, unspecified
D80.9 is a billable, specific ICD-10-CM code for immunodeficiency with predominantly antibody defects, unspecified. It is valid for submission on a claim.
Risk adjustment
D80.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
D80.9 is named in 13 Medicare coverage policies — 13 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56718Billing and Coding: Intravenous Immunoglobulin (IVIG)
- A56841Billing and Coding: Vitamin D; 25 hydroxy, includes fraction(s), if performed
- A57718Billing and Coding: Vitamin D Assay Testing
- A57736Billing and Coding: Vitamin D Assay Testing
How D80.9 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 D80.9.
- Defect, defective›antibody immunodeficiency
- Syndrome›antibody deficiency
- Deficiency, deficient›immunity›humoral
- Immunodeficiency›with›antibody defects
Related codes at this level
Codes that share D80. If D80.9 is not quite right, the correct code is usually one of these.
- D80.0Hereditary hypogammaglobulinemia
- D80.1Nonfamilial hypogammaglobulinemia
- D80.2Selective deficiency of immunoglobulin A [IgA]
- D80.3Selective deficiency of immunoglobulin G [IgG] subclasses
- D80.4Selective deficiency of immunoglobulin M [IgM]
- D80.5Immunodeficiency with increased immunoglobulin M [IgM]
- D80.6Antibody deficiency with near-normal immunoglobulins or with hyperimmunoglobulinemia
- D80.7Transient hypogammaglobulinemia of infancy
- D80.8Other immunodeficiencies with predominantly antibody defects
Questions about D80.9
- Is D80.9 a billable ICD-10-CM code?
- Yes. D80.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D80.9 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).