Is D89 a billable ICD-10-CM code?

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

Where does D89 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?

D89 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

D89

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

Non-billable headerICD-10-CM

D89 is a non-billable header ICD-10-CM code for other 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 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

transplant failure and rejection (T86.-)

Other codes that can never be billed with D89

These codes carry an Excludes1 note pointing at D89. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D89 alone.

D72Other disorders of white blood cells
E88.0Disorders of plasma-protein metabolism, not elsewhere classified
D69Purpura and other hemorrhagic conditions

Risk adjustment

D89 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 D89

7 child codes. Green means billable.

Questions about D89

Is D89 a billable ICD-10-CM code?: No. D89 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D89 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?: D89 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.