Is K90 a billable ICD-10-CM code?

No. K90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does K90 sit in the tabular list?

Diseases of the digestive system (K00-K95), in the block Other diseases of the digestive system (K90-K95).

What cannot be coded together with K90?

K90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

K90

K90 — Intestinal malabsorption

Non-billable headerICD-10-CM

K90 is a non-billable header ICD-10-CM code for intestinal malabsorption. 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.

intestinal malabsorption following gastrointestinal surgery (K91.2)

Other codes that can never be billed with K90

These codes carry an Excludes1 note pointing at K90. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading K90 alone.

E55.0Rickets, active
E88.1Lipodystrophy, not elsewhere classified
K59Other functional intestinal disorders

Risk adjustment

K90 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 K90

7 child codes. Green means billable.

Questions about K90

Is K90 a billable ICD-10-CM code?: No. K90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does K90 sit in the tabular list?: Diseases of the digestive system (K00-K95), in the block Other diseases of the digestive system (K90-K95).
What cannot be coded together with K90?: K90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.