ICD-10 code for Quervain's disease

The ICD-10-CM code for Quervain's disease is M65.4 (Radial styloid tenosynovitis [de Quervain]). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on M65.4.

Within M65 (synovitis and tenosynovitis), M65.4 is specifically for radial styloid tenosynovitis [de Quervain]. Related codes cover abscess of tendon sheath (M65.0), other infective (teno)synovitis (M65.1), Calcific tendinitis (M65.2), Trigger finger (M65.3), other synovitis and tenosynovitis (M65.8) and unspecified (M65.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

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.