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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

What this means — in plain language

MedlinePlus · NIH

What is arthritis? If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Any disorder that affects the joints is often called arthritis. Joints are places where two bones meet, such as your elbow or knee. Most types of arthritis can cause joint pain and inflammation (swelling). Over time, a swollen joint can become severely damaged. Some kinds of arthritis can also…

Read more about Arthritis at MedlinePlus ↗
Connective Tissue Disorders ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

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.

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