2026 ICD-10-CM Diagnosis Code A15.4Tuberculosis of intrathoracic lymph nodes
ICD-10-CM Codes›A00–B99›A15-A19›A15
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A15.4 is a billable ICD-10-CM diagnosis code for tuberculosis of intrathoracic lymph nodes. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 177 through 179, 974 through 976. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 127 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tuberculosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Hilar lymphadenopathy
- Infection of lower respiratory tract and mediastinum
- Mycobacterial lymphadenitis
- Tuberculosis of hilar lymph nodes
- Tuberculosis of intrathoracic lymph nodes
- Tuberculosis of mediastinal lymph nodes
- Tuberculosis of mediastinum
- Tuberculosis of tracheobronchial lymph nodes
- Tuberculous adenitis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Tuberculosis of hilar lymph nodes
- Tuberculosis of mediastinal lymph nodes
- Tuberculosis of tracheobronchial lymph nodes
Type 1 Excludes
- tuberculosis specified as primary A15.7
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.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Adenopathy (lymph gland) R59.9
tuberculous A15.4
tuberculous See Also: Tuberculosis, lymph gland;
tracheobronchial A15.4
Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
bronchi, bronchial, bronchus A15.5
gland or node A15.4
lymph gland or node A15.4
hilar lymph nodes A15.4
lymph gland or node (peripheral) A18.2
bronchial A15.4
hilar A15.4
intrathoracic A15.4
mediastinal A15.4
tracheobronchial A15.4
lymph gland or node A15.4
lymph gland or node A15.4
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert A15.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A15.4Overview
What is the ICD-10 code for tuberculosis of intrathoracic lymph nodes?
The ICD-10-CM code for tuberculosis of intrathoracic lymph nodes is A15.4 (sometimes written as A154). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is A15.4 (Respiratory tuberculosis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report tuberculosis of intrathoracic lymph nodes on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A15.4 group to?
When tuberculosis of intrathoracic lymph nodes is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, 974, 975, 976, with relative weights from 0.7550 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A15.4 a CC or MCC?
CMS lists A15.4 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 127 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A15.4?
Under the General Equivalence Mappings, tuberculosis of intrathoracic lymph nodes converts to ICD-9-CM 012.10 (TB thoracic nodes-unspec). The mapping is approximate, so confirm the match fits the documentation.
