M65.4

ICD-10Billable

Radial styloid tenosynovitis [de Quervain]

Official ICD-10-CM descriptor (FY2026)

Radial styloid tenosynovitis [de Quervain]

M65.4 is valid for submission on a claim — CMS flags it as a billable, specific code.

Related codes in M65

M65.0Abscess of tendon sheathcategory
M65.1Other infective (teno)synovitiscategory
M65.2Calcific tendinitiscategory
M65.3Trigger fingercategory
M65.8Other synovitis and tenosynovitiscategory
M65.9Synovitis and tenosynovitis, unspecifiedcategory

Where this code sits

Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: Disorders of synovium and tendon (M65-M67)
Parent code: M65

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.