ICD-10-CM 2027
ICD-10 code for syphilitic late leontiasis
From the official ICD-10-CM alphabetic index entry “Leontiasis › syphilitic (late)”. Page updated September 29, 2026.
About coding syphilitic late leontiasis
The ICD-10-CM code for syphilitic late leontiasis is A52.78 (Syphilis of other musculoskeletal tissue). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on A52.78.
Within A52.7, choose A52.78 (Syphilis of other musculoskeletal tissue) only when documentation doesn't support a more specific option: late syphilitic oculopathy (A52.71), syphilis of lung and bronchus (A52.72), 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) 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 557 (Tendonitis, Myositis and Bursitis with MCC, relative weight 1.489) and DRG 558 (Tendonitis, Myositis and Bursitis without MCC, relative weight 0.8875), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific syphilitic late leontiasis codes (official index)
- congenital A50.59 — Other late congenital syphilis, symptomatic
Common questions about syphilitic late leontiasis ICD-10 codes
What is the ICD-10 code for syphilitic late leontiasis?
- A52.78 — Syphilis of other musculoskeletal tissue. More specific codes apply when the documentation supports them: A50.59.
What is the ICD-10 code for congenital syphilitic late leontiasis?
- A50.59 — Other late congenital syphilis, symptomatic.
Is A52.78 billable?
- Yes. A52.78 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A52.78 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A52.78 as a principal diagnosis.
Is A52.78 a CC or MCC?
- A52.78 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.