2026 ICD-10-CM Diagnosis Code A52.72Syphilis of lung and bronchus

ICD-10-CM Codes›A00–B99›A50-A64›A52

ICD-10-CM A52.72
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A52.72 is a billable ICD-10-CM diagnosis code for syphilis of lung and bronchus. 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. 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 149 closely related codes. Coders also document this condition as late syphilis of lung. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pneumonia (except that caused by tuberculosis) and Sexually transmitted infections (excluding HIV and hepatitis).

Code Identity

ICD-10-CM Code
A52.72
Billable Status
Yes — Valid for Submission
Code Describes
Syphilis of lung and bronchus
Short Description
Syphilis of lung and bronchus
Same as the full description in the CMS dataset.
Parent Code
A52.7
Other symptomatic late syphilis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA52Late syphilis
This CodeA52.72Syphilis of lung and bronchus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Late syphilis of lung
  • Syphilis of lung

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR RSP002
Pneumonia (except that caused by tuberculosis)
Default principal diagnosis: inpatient No · outpatient No
CCSR INF010
Sexually transmitted infections (excluding HIV and hepatitis)
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Lung Diseases

When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty breathing. Millions of people in the U.S. have lung disease.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A52.72 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
095.1 Syphilis of lung
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A52.72Overview

What is the ICD-10 code for syphilis of lung and bronchus?

The ICD-10-CM code for syphilis of lung and bronchus is A52.72 (sometimes written as A5272). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is A52.72 (Other symptomatic late syphilis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report syphilis of lung and bronchus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A52.72 group to?

When syphilis of lung and bronchus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, with relative weights from 0.7550 to 1.5627 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A52.72 a CC or MCC?

CMS lists A52.72 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 149 closely related codes in its exclusion list.

What is the ICD-9 equivalent of A52.72?

Under the General Equivalence Mappings, syphilis of lung and bronchus converts to ICD-9-CM 095.1 (syphilis of lung). The mapping is approximate, so confirm the match fits the documentation.