M65.4
✓ Billable
Radial styloid tenosynovitis [de Quervain]
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M65.4
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code M65.4?
ICD-10-CM code M65.4 represents Radial styloid tenosynovitis [de Quervain]. It is a billable diagnosis code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M65.4 billable?
Yes. M65.4 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is M65.4 in?
M65.4 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M65 category
M65
Synovitis and tenosynovitis
Non-billable
M65.0
Abscess of tendon sheath
Non-billable
M65.1
Other infective (teno)synovitis
Non-billable
M65.2
Calcific tendinitis
Non-billable
M65.3
Trigger finger
Non-billable
M65.8
Other synovitis and tenosynovitis
Non-billable
M65.9
Synovitis and tenosynovitis, unspecified
Non-billable
M65.00
Abscess of tendon sheath, unspecified site
Billable
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