Is D84 a billable ICD-10-CM code?

No. D84 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does D84 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).

D84

D84 — Other immunodeficiencies

Non-billable headerICD-10-CM

D84 is a non-billable header ICD-10-CM code for other immunodeficiencies. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with D84

These codes carry an Excludes1 note pointing at D84. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D84 alone.

L50Urticaria
D84.81Immunodeficiency due to conditions classified elsewhere

Risk adjustment

D84 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.

Code to one of these instead D84

4 child codes. Green means billable.

Questions about D84

Is D84 a billable ICD-10-CM code?: No. D84 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D84 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).