Is M65 a billable code?
No. M65 is a header code that groups 133 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
M65: Synovitis and tenosynovitis
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
M65 groups related diagnoses under 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
- M65.00Abscess of tendon sheath, unspecified site
- M65.011Abscess of tendon sheath, right shoulder
- M65.012Abscess of tendon sheath, left shoulder
- M65.019Abscess of tendon sheath, unspecified shoulder
- M65.021Abscess of tendon sheath, right upper arm
- M65.022Abscess of tendon sheath, left upper arm
- M65.029Abscess of tendon sheath, unspecified upper arm
- M65.031Abscess of tendon sheath, right forearm
- M65.032Abscess of tendon sheath, left forearm
- M65.039Abscess of tendon sheath, unspecified forearm
- M65.041Abscess of tendon sheath, right hand
- M65.042Abscess of tendon sheath, left hand
- M65.049Abscess of tendon sheath, unspecified hand
- M65.051Abscess of tendon sheath, right thigh
- M65.052Abscess of tendon sheath, left thigh
- M65.059Abscess of tendon sheath, unspecified thigh
- M65.061Abscess of tendon sheath, right lower leg
- M65.062Abscess of tendon sheath, left lower leg
- M65.069Abscess of tendon sheath, unspecified lower leg
- M65.071Abscess of tendon sheath, right ankle and foot
- M65.072Abscess of tendon sheath, left ankle and foot
- M65.079Abscess of tendon sheath, unspecified ankle and foot
- M65.08Abscess of tendon sheath, other site
- M65.10Other infective (teno)synovitis, unspecified site
- M65.111Other infective (teno)synovitis, right shoulder
- M65.112Other infective (teno)synovitis, left shoulder
- M65.119Other infective (teno)synovitis, unspecified shoulder
- M65.121Other infective (teno)synovitis, right elbow
- M65.122Other infective (teno)synovitis, left elbow
- M65.129Other infective (teno)synovitis, unspecified elbow
- M65.131Other infective (teno)synovitis, right wrist
- M65.132Other infective (teno)synovitis, left wrist
- M65.139Other infective (teno)synovitis, unspecified wrist
- M65.141Other infective (teno)synovitis, right hand
- M65.142Other infective (teno)synovitis, left hand
- M65.149Other infective (teno)synovitis, unspecified hand
- M65.151Other infective (teno)synovitis, right hip
- M65.152Other infective (teno)synovitis, left hip
- M65.159Other infective (teno)synovitis, unspecified hip
- M65.161Other infective (teno)synovitis, right knee
- M65.162Other infective (teno)synovitis, left knee
- M65.169Other infective (teno)synovitis, unspecified knee
- M65.171Other infective (teno)synovitis, right ankle and foot
- M65.172Other infective (teno)synovitis, left ankle and foot
- M65.179Other infective (teno)synovitis, unspecified ankle and foot
- M65.18Other infective (teno)synovitis, other site
- M65.19Other infective (teno)synovitis, multiple sites
- M65.20Calcific tendinitis, unspecified site
- M65.221Calcific tendinitis, right upper arm
- M65.222Calcific tendinitis, left upper arm
- M65.229Calcific tendinitis, unspecified upper arm
- M65.231Calcific tendinitis, right forearm
- M65.232Calcific tendinitis, left forearm
- M65.239Calcific tendinitis, unspecified forearm
- M65.241Calcific tendinitis, right hand
- M65.242Calcific tendinitis, left hand
- M65.249Calcific tendinitis, unspecified hand
- M65.251Calcific tendinitis, right thigh
- M65.252Calcific tendinitis, left thigh
- M65.259Calcific tendinitis, unspecified thigh
- M65.261Calcific tendinitis, right lower leg
- M65.262Calcific tendinitis, left lower leg
- M65.269Calcific tendinitis, unspecified lower leg
- M65.271Calcific tendinitis, right ankle and foot
- M65.272Calcific tendinitis, left ankle and foot
- M65.279Calcific tendinitis, unspecified ankle and foot
- M65.28Calcific tendinitis, other site
- M65.29Calcific tendinitis, multiple sites
- M65.30Trigger finger, unspecified finger
- M65.311Trigger thumb, right thumb
- M65.312Trigger thumb, left thumb
- M65.319Trigger thumb, unspecified thumb
- M65.321Trigger finger, right index finger
- M65.322Trigger finger, left index finger
- M65.329Trigger finger, unspecified index finger
- M65.331Trigger finger, right middle finger
- M65.332Trigger finger, left middle finger
- M65.339Trigger finger, unspecified middle finger
- M65.341Trigger finger, right ring finger
- M65.342Trigger finger, left ring finger
- M65.349Trigger finger, unspecified ring finger
- M65.351Trigger finger, right little finger
- M65.352Trigger finger, left little finger
- M65.359Trigger finger, unspecified little finger
- M65.4Radial styloid tenosynovitis [de Quervain]
- 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
- M65.90Unspecified synovitis and tenosynovitis, unspecified site
- M65.911Unspecified synovitis and tenosynovitis, right shoulder
- M65.912Unspecified synovitis and tenosynovitis, left shoulder
- M65.919Unspecified synovitis and tenosynovitis, unspecified shoulder
- M65.921Unspecified synovitis and tenosynovitis, right upper arm
- M65.922Unspecified synovitis and tenosynovitis, left upper arm
- M65.929Unspecified synovitis and tenosynovitis, unspecified upper arm
- M65.931Unspecified synovitis and tenosynovitis, right forearm
- M65.932Unspecified synovitis and tenosynovitis, left forearm
- M65.939Unspecified synovitis and tenosynovitis, unspecified forearm
- M65.941Unspecified synovitis and tenosynovitis, right hand
- M65.942Unspecified synovitis and tenosynovitis, left hand
- M65.949Unspecified synovitis and tenosynovitis, unspecified hand
- M65.951Unspecified synovitis and tenosynovitis, right thigh
- M65.952Unspecified synovitis and tenosynovitis, left thigh
- M65.959Unspecified synovitis and tenosynovitis, unspecified thigh
- M65.961Unspecified synovitis and tenosynovitis, right lower leg
- M65.962Unspecified synovitis and tenosynovitis, left lower leg
- M65.969Unspecified synovitis and tenosynovitis, unspecified lower leg
- M65.971Unspecified synovitis and tenosynovitis, right ankle and foot
- M65.972Unspecified synovitis and tenosynovitis, left ankle and foot
- M65.979Unspecified synovitis and tenosynovitis, unspecified ankle and foot
- M65.98Unspecified synovitis and tenosynovitis, other site
- M65.99Unspecified synovitis and tenosynovitis, multiple sites
M65 questions
What does M65 mean?
M65 is the ICD-10-CM code for 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.