Is K59.8 a billable ICD-10-CM code?

No. K59.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does K59.8 sit in the tabular list?

Diseases of the digestive system (K00-K95), in the block Other diseases of intestines (K55-K64).

What cannot be coded together with K59.8?

K59.8 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 K59.8 (K59) and apply to it just the same.

K59.8

K59.8 — Other specified functional intestinal disorders

Non-billable headerICD-10-CM

K59.8 is a non-billable header ICD-10-CM code for other specified functional intestinal disorders. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above K59.8

These are not written on K59.8, but they bind it: a note on a category applies to every code beneath it. Billing K59.8 with anything listed here is a denial.

Written on K59 — Other functional intestinal disorders

change in bowel habit NOS (R19.4)
intestinal malabsorption (K90.-)
psychogenic intestinal disorders (F45.8)

Excludes2 inherited from the categories above K59.8

Also inherited, and the opposite of Excludes1: these conditions are not part of K59.8, but a patient can have both, so you may code both.

Written on K59 — Other functional intestinal disorders

functional disorders of stomach (K31.-)

Risk adjustment

K59.8 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

K59.8 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 K59.8

2 child codes. Green means billable.

Related codes at this level

Codes that share K59. If K59.8 is not quite right, the correct code is usually one of these.

Questions about K59.8

Is K59.8 a billable ICD-10-CM code?: No. K59.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does K59.8 sit in the tabular list?: Diseases of the digestive system (K00-K95), in the block Other diseases of intestines (K55-K64).
What cannot be coded together with K59.8?: K59.8 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 K59.8 (K59) and apply to it just the same.