2026 ICD-10-CM Diagnosis Code A18Tuberculosis of other organs

ICD-10-CM Codes›A00–B99›A15-A19›A18

ICD-10-CM A18
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A18 is a non-billable ICD-10-CM category code for tuberculosis of other organs, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A18.01, A18.02, A18.03, and A18.09.

Code Identity

ICD-10-CM Code
A18
Billable Status
No — Non-Billable Category
Code Describes
Tuberculosis of other organs
Chapter
A15-A19
Tuberculosis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA15-A19Tuberculosis
CategoryA18Tuberculosis of other organs
This CodeA18Tuberculosis of other organs

Specific Coding for Tuberculosis of other organsOverview

Non-specific codes like A18 require more characters. Use one of these billable codes instead:

  • A18.0 for Tuberculosis of bones and joints

  • Use A18.01 for Tuberculosis of spine

  • Use A18.02 for Tuberculous arthritis of other joints

  • Use A18.03 for Tuberculosis of other bones

  • Use A18.09 for Other musculoskeletal tuberculosis

  • A18.1 for Tuberculosis of genitourinary system

  • Use A18.10 for Tuberculosis of genitourinary system, unspecified

  • Use A18.11 for Tuberculosis of kidney and ureter

  • Use A18.12 for Tuberculosis of bladder

  • Use A18.13 for Tuberculosis of other urinary organs

  • Use A18.14 for Tuberculosis of prostate

  • Use A18.15 for Tuberculosis of other male genital organs

  • Use A18.16 for Tuberculosis of cervix

  • Use A18.17 for Tuberculous female pelvic inflammatory disease

  • Use A18.18 for Tuberculosis of other female genital organs

  • Use A18.2 for Tuberculous peripheral lymphadenopathy

  • A18.3 for Tuberculosis of intestines, peritoneum and mesenteric glands

  • Use A18.31 for Tuberculous peritonitis

  • Use A18.32 for Tuberculous enteritis

  • Use A18.39 for Retroperitoneal tuberculosis

  • Use A18.4 for Tuberculosis of skin and subcutaneous tissue

  • A18.5 for Tuberculosis of eye

  • Use A18.50 for Tuberculosis of eye, unspecified

  • Use A18.51 for Tuberculous episcleritis

  • Use A18.52 for Tuberculous keratitis

  • Use A18.53 for Tuberculous chorioretinitis

  • Use A18.54 for Tuberculous iridocyclitis

  • Use A18.59 for Other tuberculosis of eye

  • Use A18.6 for Tuberculosis of (inner) (middle) ear

  • Use A18.7 for Tuberculosis of adrenal glands

  • A18.8 for Tuberculosis of other specified organs

  • Use A18.81 for Tuberculosis of thyroid gland

  • Use A18.82 for Tuberculosis of other endocrine glands

  • Use A18.83 for Tuberculosis of digestive tract organs, not elsewhere classified

  • Use A18.84 for Tuberculosis of heart

  • Use A18.85 for Tuberculosis of spleen

  • Use A18.89 for Tuberculosis of other sites

Patient EducationClinical

Tuberculosis

Tuberculosis (TB) is a bacterial disease that usually attacks the lungs. But it can also attack other parts of the body, including the kidneys, spine, and brain.

The full article covers:

  • What is tuberculosis (TB)?
  • What causes tuberculosis (TB)?
  • Who is more likely to get infected with tuberculosis (TB) germs?
  • Who is more likely to develop TB disease?
  • What are the symptoms of tuberculosis (TB)?
  • How is tuberculosis (TB) diagnosed?
  • What is the treatment for tuberculosis (TB)?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A18Overview

Is A18 (Tuberculosis of other organs) a billable code?

No. This is a category header that groups the codes for tuberculosis of other organs, and headers cannot be submitted on claims. Claims for tuberculosis of other organs need a more specific code from this category, such as A18.01, A18.02, and A18.03.