2026 ICD-10-CM Diagnosis Code A18.84Tuberculosis of heart
ICD-10-CM Codes›A00–B99›A15-A19›A18
- Billable — Valid for Submission
- Chronic Condition
A18.84 is a billable ICD-10-CM diagnosis code for tuberculosis of heart. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869, 974 through 976. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endocarditis and endocardial disease and Tuberculosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute bacterial pericarditis
- Acute myocarditis - tuberculous
- Acute tuberculous pericarditis
- Constrictive pericarditis
- Constrictive pericarditis caused by bacteria
- Constrictive pericarditis caused by Mycobacterium tuberculosis complex
- Infective constrictive pericarditis
- Pericarditis with pericardial effusion caused by Mycobacterium tuberculosis complex
- Tuberculosis of endocardium
- Tuberculosis of heart
- Tuberculosis of mediastinum
- Tuberculosis of myocardium
- Tuberculosis of pericardium
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Tuberculous cardiomyopathy
- Tuberculous endocarditis
- Tuberculous myocarditis
- Tuberculous pericarditis
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Adhesions, adhesive (postinfective) - K66.0
- pericardium (nonrheumatic) - I31.0
- tuberculous - A18.84
- Cardiomyopathy (familial) (idiopathic) - I42.9
- tuberculous - A18.84
- Myocarditis (with arteriosclerosis) (chronic) (fibroid) (interstitial) (old) (progressive) (senile) - I51.4
- tuberculous - A18.84
- Pericarditis (with decompensation) (with effusion) - I31.9
- fibrinocaseous (tuberculous) - A18.84
- tuberculous - A18.84
- Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) - A15.9
- adherent pericardium - A18.84
- cardiomyopathy - A18.84
- endocarditis - A18.84
- heart - A18.84
- myocardium, myocarditis - A18.84
- pericardium, pericarditis - A18.84
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Adhesions, adhesive(postinfective)
- pericardium (nonrheumatic)
- tuberculous
- Cardiomyopathy(familial) (idiopathic)
- tuberculous
- Myocarditis(with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)
- tuberculous
- Pericarditis(with decompensation) (with effusion)
- fibrinocaseous (tuberculous)
- Pericarditis(with decompensation) (with effusion)
- tuberculous
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- adherent pericardium
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- cardiomyopathy
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- endocarditis
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- endocarditis
- aortic
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- endocarditis
- mitral
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- endocarditis
- pulmonary
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- endocarditis
- tricuspid
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- heart
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- myocardium, myocarditis
- Tuberculosis, tubercular, tuberculous(calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative)
- pericardium, pericarditis
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Heart Diseases
Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.
The full article covers:
- What is heart disease?
- What are the types of heart disease?
- What causes heart diseases?
- Who is more likely to develop heart diseases?
- What are the symptoms of heart disease?
- How are heart diseases diagnosed?
- What are the treatments for heart disease?
- Can heart diseases be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A18.84 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A18.84Overview
Is A18.84 (Tuberculosis of other specified organs) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report tuberculosis of heart on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A18.84 group to?
When tuberculosis of heart is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, 974, 975, 976, with relative weights from 0.7297 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of A18.84?
Under the General Equivalence Mappings, tuberculosis of heart converts to ICD-9-CM 017.90 (TB of organ NEC-unspec), 017.90 (TB of organ NEC-unspec), and 420.0 (ac pericardit in oth dis). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
