M65

Non-billable

Synovitis and tenosynovitis

M65 is the ICD-10-CM code for Synovitis and tenosynovitis. It is a non-billable category code — use a more specific child code such as M65.0 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Subcodes
7
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

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.-)

Frequently asked questions

What is ICD-10 code M65?
M65 is the ICD-10-CM code for "Synovitis and tenosynovitis". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M65 a billable code?
No — M65 is a non-billable header code. Use a more specific child code (such as M65.0) for billing.
What are the subcodes of M65?
M65 has 7 more specific child codes, including M65.0, M65.1, M65.2.
What is excluded from M65?
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.-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

Look up another ICD-10 code or condition

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.