D84.89 — Other immunodeficiencies
D84.89 is a billable, specific ICD-10-CM code for other immunodeficiencies. It is valid for submission on a claim.
Risk adjustment
D84.89 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
D84.89 is named in 17 Medicare coverage policies — 17 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56464Billing and Coding: Flow Cytometry
- A56638Billing and Coding: Gastrointestinal Pathogen (GIP) Panels Utilizing Multiplex Nucleic Acid Amplification Techniques (NAATs)
- A56642Billing and Coding: Gastrointestinal Pathogen (GIP) Panels Utilizing Multiplex Nucleic Acid Amplification Techniques (NAATs)
- A57044Billing and Coding: Removal of Benign Skin Lesions
How D84.89 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 D84.89.
- Immunodeficiency›specified type NEC
- Deficiency, deficient›immunity›cell-mediated
Related codes at this level
Codes that share D84.8. If D84.89 is not quite right, the correct code is usually one of these.
Questions about D84.89
- Is D84.89 a billable ICD-10-CM code?
- Yes. D84.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D84.89 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).