ICD-10-CM 2027 diagnosis code

A18Tuberculosis of other organs

Not billable — use a more specific code

A18 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A18

A18 is the ICD-10-CM diagnosis code for tuberculosis of other organs. It belongs to block A15-A19 (tuberculosis) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: A18.0 (joints), A18.1 (system), A18.2 (lymphadenopathy), A18.3 (glands), A18.4 (tissue), A18.5 (eye), A18.6 (ear), A18.7 (glands) and 1 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under A18

Notes that apply from higher levels

Instructions written at a parent level also apply to A18.

Broader instructions also apply from A15-A19 Tuberculosis and Chapter 1: Certain infectious and parasitic diseases.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about A18

Is A18 billable?: No. A18 is a header code. Report one of its more specific subcodes instead.