ICD-10 code for synovitis tuberculosis

The ICD-10-CM code for synovitis tuberculosis is A18.09 (Other musculoskeletal tuberculosis). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A18.09.

Within A18.0, choose A18.09 (Other musculoskeletal tuberculosis) only when documentation doesn't support a more specific option: tuberculosis of spine (A18.01), tuberculous arthritis of other joints (A18.02) and tuberculosis of other bones (A18.03).

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 548 (Septic Arthritis with MCC, relative weight 1.9519), DRG 549 (Septic Arthritis with CC, relative weight 1.1435), DRG 550 (Septic Arthritis without CC/MCC, relative weight 0.8591), 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 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue) 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.