M65.99 is the authoritative medical code for Unspecified synovitis and tenosynovitis, multiple sites. This classification is used in medical billing and clinical recording to specify the clinical criteria for unspecified synovitis and tenosynovitis, multiple sites (ICD-10-CM M65.99), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Unspecified synovitis and tenosynovitis, multiple sites is a billable ICD-10-CM diagnosis code M65.99. Excludes1 (not coded here): 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.-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for M65.99 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- 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.-
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with M65.99?
Per official ICD-10-CM Excludes1 instructions, M65.99 must not be reported together with: 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.-).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to M65.99 in its code family, with their registry titles.
- M65 — Synovitis and tenosynovitis
- M65.0 — Abscess of tendon sheath
- 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
- M65.021 — Abscess of tendon sheath, right upper arm
- M65.022 — Abscess of tendon sheath, left upper arm
- M65.029 — Abscess of tendon sheath, unspecified upper arm
View all 40 codes in the M65 family
Indexed Clinical Terms (1)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Synovitis, multiple sites, unspecified type