2026 ICD-10-CM Diagnosis Code A18.2Tuberculous peripheral lymphadenopathy
ICD-10-CM Codes›A00–B99›A15-A19›A18
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A18.2 is a billable ICD-10-CM diagnosis code for tuberculous peripheral lymphadenopathy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 814 through 816, 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 15 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.
- Cervical lymph node abscess
- Cervical lymphadenitis
- Cervical tuberculous lymphadenitis
- Lymph node abscess
- Mycobacterial lymphadenitis
- Scrofulous tuberculous abscess
- Tuberculosis of peripheral lymph nodes
- Tuberculous adenitis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Tuberculous adenitis
Type 2 Excludes
- tuberculosis of bronchial and mediastinal lymph nodes A15.4
- tuberculosis of mesenteric and retroperitoneal lymph nodes A18.39
- tuberculous tracheobronchial adenopathy A15.4
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 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
scrofulous (tuberculous) A18.2
Adenitis See Also: Lymphadenitis;
scrofulous (tuberculous) A18.2
strumous, tuberculous A18.2
Disease, diseased See Also: Syndrome;
scrofulous (tuberculous) A18.2
Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
scrofulous A18.2
axilla, axillary (gland) A18.2
glandular, general A18.2
infraclavicular gland A18.2
inguinal gland A18.2
inguinalis A18.2
lymph gland or node (peripheral) A18.2
cervical A18.2
neck gland A18.2
scrofulous A18.2
supraclavicular gland A18.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Cervical Lymphadenitis
inflammation of the cervical lymph nodes.Lymph Node Abscess
an abscess that develops in a lymph node and the surrounding tissues as a result of an infectious process. the affected lymph node is palpable and tender.
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 A18.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A18.2Overview
What is the ICD-10 code for tuberculous peripheral lymphadenopathy?
The ICD-10-CM code for tuberculous peripheral lymphadenopathy is A18.2 (sometimes written as A182). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is A18.2 (Tuberculosis of other organs) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report tuberculous peripheral lymphadenopathy on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A18.2 group to?
When tuberculous peripheral lymphadenopathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 814, 815, 816, 974, 975, 976, with relative weights from 0.6320 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A18.2 a CC or MCC?
CMS lists A18.2 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 15 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A18.2?
Under the General Equivalence Mappings, tuberculous peripheral lymphadenopathy converts to ICD-9-CM 017.20 (TB periph lymph-unspec). The mapping is approximate, so confirm the match fits the documentation.
