A18
A18 — Tuberculosis of other organs
Non-billable headerICD-10-CM
A18 is a non-billable header ICD-10-CM code for tuberculosis of other organs. 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
These codes carry an Excludes1 note pointing at A18. 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 alone.
- E27.1Primary adrenocortical insufficiency
- E35Disorders of endocrine glands in diseases classified elsewhere
- H20.0Acute and subacute iridocyclitis
- H32Chorioretinal disorders in diseases classified elsewhere
- H42Glaucoma in diseases classified elsewhere
- H66.3Other chronic suppurative otitis media
- H67Otitis media in diseases classified elsewhere
- H70.1Chronic mastoiditis
Risk adjustment
A18 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
A18 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 A18
9 child codes. Green means billable.
- A18.0Tuberculosis of bones and joints
- A18.1Tuberculosis of genitourinary system
- A18.2Tuberculous peripheral lymphadenopathy
- A18.3Tuberculosis of intestines, peritoneum and mesenteric glands
- A18.4Tuberculosis of skin and subcutaneous tissue
- A18.5Tuberculosis of eye
- A18.6Tuberculosis of (inner) (middle) ear
- A18.7Tuberculosis of adrenal glands
- A18.8Tuberculosis of other specified organs
Questions about A18
- Is A18 a billable ICD-10-CM code?
- No. A18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does A18 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Tuberculosis (A15-A19).