ICD-10-CM 2027
ICD-10 code for lung syphilis
From the official ICD-10-CM alphabetic index entry “Syphilis, syphilitic (acquired) › lung”. Page updated September 29, 2026.
About coding lung syphilis
The ICD-10-CM code for lung syphilis is A52.72 (Syphilis of lung and bronchus).
Within A52.7 (other symptomatic late syphilis), A52.72 is specifically for syphilis of lung and bronchus. Related codes cover late syphilitic oculopathy (A52.71), symptomatic late syphilis of other respiratory organs (A52.73), syphilis of liver and other viscera (A52.74), syphilis of kidney and ureter (A52.75), other genitourinary symptomatic late syphilis (A52.76), syphilis of bone and joint (A52.77), syphilis of other musculoskeletal tissue (A52.78) and other symptomatic late syphilis (A52.79).
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 177 (Respiratory Infections and Inflammations with MCC, relative weight 1.6092), DRG 178 (Respiratory Infections and Inflammations with CC, relative weight 0.9744) and DRG 179 (Respiratory Infections and Inflammations without CC/MCC, relative weight 0.7345), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about lung syphilis ICD-10 codes
What is the ICD-10 code for lung syphilis?
- A52.72 — Syphilis of lung and bronchus.
Is A52.72 billable?
- Yes. A52.72 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A52.72 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A52.72 as a principal diagnosis.
Is A52.72 a CC or MCC?
- A52.72 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.