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ICD-10-CM 2027 diagnosis code

A18.2Tuberculous peripheral lymphadenopathy

✓ Billable / specificCC — complication/comorbidity

A18.2 is a valid, billable ICD-10-CM code for tuberculous peripheral lymphadenopathy. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Scrofula, ICD-10 code for Caseation lymphatic gland.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A18.2

A18.2 is the ICD-10-CM diagnosis code for tuberculous peripheral lymphadenopathy. It belongs to category A18 (tuberculosis of other organs), block A15-A19 (tuberculosis) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A18 (tuberculosis of other organs), A18.2 is specifically for tuberculous peripheral lymphadenopathy. Related codes cover tuberculosis of bones and joints (A18.0), tuberculosis of genitourinary system (A18.1), tuberculosis of intestines, peritoneum and mesenteric glands (A18.3), tuberculosis of skin and subcutaneous tissue (A18.4), tuberculosis of eye (A18.5), tuberculosis of (inner) (middle) ear (A18.6), tuberculosis of adrenal glands (A18.7) and tuberculosis of other specified organs (A18.8).

The conditions in its Excludes2 note aren't part of A18.2, but may be coded alongside it if the patient has both: tuberculosis of bronchial and mediastinal lymph nodes (A15.4), tuberculosis of mesenteric and retroperitoneal lymph nodes (A18.39) and tuberculous tracheobronchial adenopathy (A15.4).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444), DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506), DRG 975 (HIV with Major Related Condition with CC, relative weight 1.3252) and DRG 976 (HIV with Major Related Condition without CC/MCC, relative weight 0.8124), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 017.20 (tuberculosis of peripheral lymph nodes, unspecified).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Tuberculous adenitis
Excludes2Not included here — may be reported together if both conditions exist
  • tuberculosis of bronchial and mediastinal lymph nodes (A15.4)
  • tuberculosis of mesenteric and retroperitoneal lymph nodes (A18.39)
  • tuberculous tracheobronchial adenopathy (A15.4)

Notes that apply from higher levels

Instructions written at a parent level also apply to A18.2.

Broader instructions also apply from A15-A19 Tuberculosis and Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

22 entries

Terms in the official ICD-10-CM index that lead to A18.2.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 017.20Tuberculosis of peripheral lymph nodes, unspecifiedapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A18.2

Is A18.2 billable?

Yes. A18.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A18.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A18.2 as a principal diagnosis.

Is A18.2 a CC or MCC?

A18.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A18.2 group to?

A18.2 is used in the MS-DRG v44.0 logic for MS-DRG 814 (Reticuloendothelial and Immunity Disorders with MCC), MS-DRG 815 (Reticuloendothelial and Immunity Disorders with CC), MS-DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC), MS-DRG 974 (HIV with Major Related Condition with MCC), MS-DRG 975 (HIV with Major Related Condition with CC) and MS-DRG 976 (HIV with Major Related Condition without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A18.2?

The CMS General Equivalence Mappings map A18.2 to ICD-9-CM 017.20.