Is D89.8 a billable ICD-10-CM code?

No. D89.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does D89.8 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).

What cannot be coded together with D89.8?

D89.8 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above D89.8 (D89) and apply to it just the same.

D89.8

D89.8 — Other specified disorders involving the immune mechanism, not elsewhere classified

Non-billable headerICD-10-CM

D89.8 is a non-billable header ICD-10-CM code for other specified disorders involving the immune mechanism, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above D89.8

These are not written on D89.8, but they bind it: a note on a category applies to every code beneath it. Billing D89.8 with anything listed here is a denial.

Written on D89 — Other disorders involving the immune mechanism, not elsewhere classified

hyperglobulinemia NOS (R77.1)
monoclonal gammopathy (of undetermined significance) (D47.2)

Excludes2 inherited from the categories above D89.8

Also inherited, and the opposite of Excludes1: these conditions are not part of D89.8, but a patient can have both, so you may code both.

Written on D89 — Other disorders involving the immune mechanism, not elsewhere classified

transplant failure and rejection (T86.-)

Risk adjustment

D89.8 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 history

D89.8 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead D89.8

5 child codes. Green means billable.

Related codes at this level

Codes that share D89. If D89.8 is not quite right, the correct code is usually one of these.

Questions about D89.8

Is D89.8 a billable ICD-10-CM code?: No. D89.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D89.8 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).
What cannot be coded together with D89.8?: D89.8 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above D89.8 (D89) and apply to it just the same.