M65.00 Abscess of tendon sheath, unspecified site

Billable ICD-10-CM code, FY2026.

Applies from M65 Synovitis and tenosynovitis

Excludes1 (never code together)

• chronic crepitant synovitis of hand and wrist (M70.0-)
• current injury - see injury of ligament or tendon by body region
• soft tissue disorders related to use, overuse and pressure (M70.-)

Applies from M65.0 Abscess of tendon sheath

Use additional code

• code (B95-B96) to identify bacterial agent.

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 727.89 Other disorders of synovium, tendon, and bursa (approximate)

Diagnosis Index entries for M65.00

• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › tendon (sheath)

Nearby codes

• M65 Synovitis and tenosynovitis
• M65.0 Abscess of tendon sheath
• M65.00 Abscess of tendon sheath, unspecified site (this code)
• M65.01 Abscess of tendon sheath, shoulder
• M65.011 Abscess of tendon sheath, right shoulder
• M65.012 Abscess of tendon sheath, left shoulder
• M65.019 Abscess of tendon sheath, unspecified shoulder
• M65.02 Abscess of tendon sheath, upper arm