ICD-10 code for skeletal system syphilis

The ICD-10-CM code for skeletal system syphilis is A52.77 (Syphilis of bone and joint).

Within A52.7 (other symptomatic late syphilis), A52.77 is specifically for syphilis of bone and joint. Related codes cover 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 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 539 (Osteomyelitis with MCC, relative weight 1.9385), DRG 540 (Osteomyelitis with CC, relative weight 1.3079) and DRG 541 (Osteomyelitis without CC/MCC, relative weight 0.8297), 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.