ICD-10 code for knee joint tuberculosis

The ICD-10-CM code for knee joint tuberculosis is A18.02 (Tuberculous arthritis of other joints).

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

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 400 (Knee Procedures with Principal Diagnosis of Infection, relative weight 2.0248), 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 1 more, 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.