ICD-10 Code A18

Tuberculosis of other organs

Version 2019 Non-Billable Code
ICD-10: A18
Short Description:Tuberculosis of other organs
Long Description:Tuberculosis of other organs

Not Valid for Submission

ICD-10 A18 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of tuberculosis of other organs. The code is NOT valid for the year 2019 for the submission of HIPAA-covered transactions.

Consider the following ICD-10 codes with a higher level of specificity:

  • A18.0 - Tuberculosis of bones and joints
  • A18.01 - Tuberculosis of spine
  • A18.02 - Tuberculous arthritis of other joints
  • A18.03 - Tuberculosis of other bones
  • A18.09 - Other musculoskeletal tuberculosis
  • A18.1 - Tuberculosis of genitourinary system
  • A18.10 - Tuberculosis of genitourinary system, unspecified
  • A18.11 - Tuberculosis of kidney and ureter
  • A18.12 - Tuberculosis of bladder
  • A18.13 - Tuberculosis of other urinary organs
  • A18.14 - Tuberculosis of prostate
  • A18.15 - Tuberculosis of other male genital organs
  • A18.16 - Tuberculosis of cervix
  • A18.17 - Tuberculous female pelvic inflammatory disease
  • A18.18 - Tuberculosis of other female genital organs
  • A18.2 - Tuberculous peripheral lymphadenopathy
  • A18.3 - Tuberculosis of intestines, peritoneum and mesenteric glands
  • A18.31 - Tuberculous peritonitis
  • A18.32 - Tuberculous enteritis
  • A18.39 - Retroperitoneal tuberculosis
  • A18.4 - Tuberculosis of skin and subcutaneous tissue
  • A18.5 - Tuberculosis of eye
  • A18.50 - Tuberculosis of eye, unspecified
  • A18.51 - Tuberculous episcleritis
  • A18.52 - Tuberculous keratitis
  • A18.53 - Tuberculous chorioretinitis
  • A18.54 - Tuberculous iridocyclitis
  • A18.59 - Other tuberculosis of eye
  • A18.6 - Tuberculosis of (inner) (middle) ear
  • A18.7 - Tuberculosis of adrenal glands
  • A18.8 - Tuberculosis of other specified organs
  • A18.81 - Tuberculosis of thyroid gland
  • A18.82 - Tuberculosis of other endocrine glands
  • A18.83 - Tuberculosis of digestive tract organs, not elsewhere classified
  • A18.84 - Tuberculosis of heart
  • A18.85 - Tuberculosis of spleen
  • A18.89 - Tuberculosis of other sites

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Tuberculosis (A15-A19)
      • Tuberculosis of other organs (A18)

Information for Patients


Also called: TB

Tuberculosis (TB) is a disease caused by bacteria called Mycobacterium tuberculosis. The bacteria usually attack the lungs, but they can also damage other parts of the body.

TB spreads through the air when a person with TB of the lungs or throat coughs, sneezes, or talks. If you have been exposed, you should go to your doctor for tests. You are more likely to get TB if you have a weak immune system.

Symptoms of TB in the lungs may include

  • A bad cough that lasts 3 weeks or longer
  • Weight loss
  • Loss of appetite
  • Coughing up blood or mucus
  • Weakness or fatigue
  • Fever
  • Night sweats

Skin tests, blood tests, x-rays, and other tests can tell if you have TB. If not treated properly, TB can be deadly. You can usually cure active TB by taking several medicines for a long period of time.

NIH: National Institute of Allergy and Infectious Diseases

  • Acid-fast stain (Medical Encyclopedia)
  • Coughing up blood (Medical Encyclopedia)
  • Disseminated tuberculosis (Medical Encyclopedia)
  • Meningitis - tuberculous (Medical Encyclopedia)
  • Multidrug-Resistant Tuberculosis (MDR TB) (Centers for Disease Control and Prevention)
  • PPD skin test (Medical Encyclopedia)
  • Pulmonary tuberculosis (Medical Encyclopedia)
  • Taking medicines to treat tuberculosis (Medical Encyclopedia)
  • Tuberculosis Facts - Exposure to TB (Centers for Disease Control and Prevention)
  • Tuberculosis Facts - TB Can Be Treated (Centers for Disease Control and Prevention)
  • Tuberculosis Facts - Testing for TB (Centers for Disease Control and Prevention)
  • Tuberculosis Facts - You Can Prevent TB (Centers for Disease Control and Prevention)
  • Tuberculosis: General Information (Centers for Disease Control and Prevention)

[Learn More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.