M65 ICD-10-CM Code: Synovitis and tenosynovitis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
M65Synovitis and tenosynovitis
ICD-10-CM diagnosis code · United States clinical modification
Where M65 sits
- 1
Chapter 13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2
Section
Disorders of synovium and tendon (M65-M67)
- 3
Category M65
Synovitis and tenosynovitis
- 4
Code M65
Synovitis and tenosynovitis
Codes under M65
M65 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for M65.
Code first
No “code first” instruction is listed for M65.
Use additional code
No “use additional code” instruction is listed for M65.
Excludes1
Conditions that should not be reported together with this code.
- 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.-)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for M65.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code M65 mean?
M65 is the FY 2027 U.S. ICD-10-CM code for “Synovitis and tenosynovitis.”
Is M65 a billable or specific ICD-10-CM code?
No. M65 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is M65 located in ICD-10-CM?
M65 is listed in Chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99), within Disorders of synovium and tendon (M65-M67) (M65–M67), under category M65, Synovitis and tenosynovitis.
What coding notes are listed for M65?
No inclusion terms are listed for M65 in this reference record. No code-first instruction is listed. Excludes1 notes: 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.-). No Excludes2 note is listed.