ICD-10-CM 2027 diagnosis code

D84Other immunodeficiencies

Not billable — use a more specific code

D84 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About D84

D84 is the ICD-10-CM diagnosis code for other immunodeficiencies. It belongs to block D80-D89 (certain disorders involving the immune mechanism) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: D84.0 (defect), D84.1 (system), D84.8 (immunodeficiencies) and D84.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under D84

Notes that apply from higher levels

Instructions written at a parent level also apply to D84.

Broader instructions also apply from D80-D89 Certain disorders involving the immune mechanism and Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about D84

Is D84 billable?: No. D84 is a header code. Report one of its more specific subcodes instead.