Is A18.3 a billable ICD-10-CM code?

No. A18.3 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does A18.3 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Tuberculosis (A15-A19).

A18.3

A18.3 — Tuberculosis of intestines, peritoneum and mesenteric glands

Non-billable headerICD-10-CM

A18.3 is a non-billable header ICD-10-CM code for tuberculosis of intestines, peritoneum and mesenteric glands. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with A18.3

These codes carry an Excludes1 note pointing at A18.3. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A18.3 alone.

A04Other bacterial intestinal infections
A18.83Tuberculosis of digestive tract organs, not elsewhere classified
K65Peritonitis
K67Disorders of peritoneum in infectious diseases classified elsewhere

Risk adjustment

A18.3 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 A18.3

3 child codes. Green means billable.

Related codes at this level

Codes that share A18. If A18.3 is not quite right, the correct code is usually one of these.

Questions about A18.3

Is A18.3 a billable ICD-10-CM code?: No. A18.3 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does A18.3 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Tuberculosis (A15-A19).