Is D89.4 a billable ICD-10-CM code?

No. D89.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does D89.4 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 D89.4?

D89.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

D89.4

D89.4 — Mast cell activation syndrome and related disorders

Non-billable headerICD-10-CM

D89.4 is a non-billable header ICD-10-CM code for mast cell activation syndrome and related disorders. 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.

aggressive systemic mastocytosis (C96.21)
congenital cutaneous mastocytosis (Q82.2)
(non-congenital) cutaneous mastocytosis (D47.01)
(indolent) systemic mastocytosis (D47.02)
malignant mast cell neoplasm (C96.2-)
malignant mastocytoma (C96.29)
mast cell leukemia (C94.3-)
mast cell sarcoma (C96.22)
mastocytoma NOS (D47.09)
other mast cell neoplasms of uncertain behavior (D47.09)
systemic mastocytosis associated with a clonal hematologic non-mast cell lineage disease (SM-AHNMD) (D47.02)

Risk adjustment

D89.4 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 D89.4

6 child codes. Green means billable.

Related codes at this level

Codes that share D89. If D89.4 is not quite right, the correct code is usually one of these.

Questions about D89.4

Is D89.4 a billable ICD-10-CM code?: No. D89.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D89.4 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 D89.4?: D89.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.