Is M65.8 a billable code?
No. M65.8 is a header code that groups 24 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
M65.8: Other synovitis and tenosynovitis
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
M65.8 groups related diagnoses under other synovitis and tenosynovitis. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under M65.8
- M65.80Other synovitis and tenosynovitis, unspecified site
- M65.811Other synovitis and tenosynovitis, right shoulder
- M65.812Other synovitis and tenosynovitis, left shoulder
- M65.819Other synovitis and tenosynovitis, unspecified shoulder
- M65.821Other synovitis and tenosynovitis, right upper arm
- M65.822Other synovitis and tenosynovitis, left upper arm
- M65.829Other synovitis and tenosynovitis, unspecified upper arm
- M65.831Other synovitis and tenosynovitis, right forearm
- M65.832Other synovitis and tenosynovitis, left forearm
- M65.839Other synovitis and tenosynovitis, unspecified forearm
- M65.841Other synovitis and tenosynovitis, right hand
- M65.842Other synovitis and tenosynovitis, left hand
- M65.849Other synovitis and tenosynovitis, unspecified hand
- M65.851Other synovitis and tenosynovitis, right thigh
- M65.852Other synovitis and tenosynovitis, left thigh
- M65.859Other synovitis and tenosynovitis, unspecified thigh
- M65.861Other synovitis and tenosynovitis, right lower leg
- M65.862Other synovitis and tenosynovitis, left lower leg
- M65.869Other synovitis and tenosynovitis, unspecified lower leg
- M65.871Other synovitis and tenosynovitis, right ankle and foot
- M65.872Other synovitis and tenosynovitis, left ankle and foot
- M65.879Other synovitis and tenosynovitis, unspecified ankle and foot
- M65.88Other synovitis and tenosynovitis, other site
- M65.89Other synovitis and tenosynovitis, multiple sites
M65.8 questions
What does M65.8 mean?
M65.8 is the ICD-10-CM code for Other synovitis and tenosynovitis. It is in chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.