ICD-10-CM category
M65: Synovitis and tenosynovitis
Codes under M65 (Synovitis and tenosynovitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| M65.0 | Abscess of tendon sheath | — |
| M65.0 | Abscess of tendon sheath | — |
| M65.00 | Abscess of tendon sheath, unspecified site | ✓ |
| M65.00 | Abscess of tendon sheath, unspecified site | ✓ |
| M65.01 | Abscess of tendon sheath, shoulder | — |
| M65.01 | Abscess of tendon sheath, shoulder | — |
| M65.1 | Other infective (teno)synovitis | — |
| M65.1 | Other infective (teno)synovitis | — |
| M65.02 | Abscess of tendon sheath, upper arm | — |
| M65.02 | Abscess of tendon sheath, upper arm | — |
| M65.2 | Calcific tendinitis | — |
| M65.2 | Calcific tendinitis | — |
| M65.03 | Abscess of tendon sheath, forearm | — |
| M65.03 | Abscess of tendon sheath, forearm | — |
| M65.3 | Trigger finger | — |
| M65.3 | Trigger finger | — |
| M65.04 | Abscess of tendon sheath, hand | — |
| M65.04 | Abscess of tendon sheath, hand | — |
| M65.4 | Radial styloid tenosynovitis [de Quervain] | ✓ |
| M65.4 | Radial styloid tenosynovitis [de Quervain] | ✓ |
| M65.05 | Abscess of tendon sheath, thigh | — |
| M65.05 | Abscess of tendon sheath, thigh | — |
| M65.06 | Abscess of tendon sheath, lower leg | — |
| M65.06 | Abscess of tendon sheath, lower leg | — |
| M65.07 | Abscess of tendon sheath, ankle and foot | — |
| M65.07 | Abscess of tendon sheath, ankle and foot | — |
| M65.08 | Abscess of tendon sheath, other site | ✓ |
| M65.08 | Abscess of tendon sheath, other site | ✓ |
| M65.8 | Other synovitis and tenosynovitis | — |
| M65.8 | Other synovitis and tenosynovitis | — |
| M65.9 | Synovitis and tenosynovitis, unspecified | — |
| M65.9 | Synovitis and tenosynovitis, unspecified | — |
| M65.10 | Other infective (teno)synovitis, unspecified site | ✓ |
| M65.10 | Other infective (teno)synovitis, unspecified site | ✓ |
| M65.011 | Abscess of tendon sheath, right shoulder | ✓ |
| M65.011 | Abscess of tendon sheath, right shoulder | ✓ |
| M65.11 | Other infective (teno)synovitis, shoulder | — |
| M65.11 | Other infective (teno)synovitis, shoulder | — |
| M65.012 | Abscess of tendon sheath, left shoulder | ✓ |
| M65.012 | Abscess of tendon sheath, left shoulder | ✓ |
| M65.12 | Other infective (teno)synovitis, elbow | — |
| M65.12 | Other infective (teno)synovitis, elbow | — |
| M65.13 | Other infective (teno)synovitis, wrist | — |
| M65.13 | Other infective (teno)synovitis, wrist | — |
| M65.14 | Other infective (teno)synovitis, hand | — |
| M65.14 | Other infective (teno)synovitis, hand | — |
| M65.15 | Other infective (teno)synovitis, hip | — |
| M65.15 | Other infective (teno)synovitis, hip | — |
| M65.16 | Other infective (teno)synovitis, knee | — |
| M65.16 | Other infective (teno)synovitis, knee | — |
| M65.17 | Other infective (teno)synovitis, ankle and foot | — |
| M65.17 | Other infective (teno)synovitis, ankle and foot | — |
| M65.18 | Other infective (teno)synovitis, other site | ✓ |
| M65.18 | Other infective (teno)synovitis, other site | ✓ |
| M65.019 | Abscess of tendon sheath, unspecified shoulder | ✓ |
| M65.019 | Abscess of tendon sheath, unspecified shoulder | ✓ |
| M65.19 | Other infective (teno)synovitis, multiple sites | ✓ |
| M65.19 | Other infective (teno)synovitis, multiple sites | ✓ |
| M65.20 | Calcific tendinitis, unspecified site | ✓ |
| M65.20 | Calcific tendinitis, unspecified site | ✓ |
| M65.021 | Abscess of tendon sheath, right upper arm | ✓ |
| M65.021 | Abscess of tendon sheath, right upper arm | ✓ |
| M65.022 | Abscess of tendon sheath, left upper arm | ✓ |
| M65.022 | Abscess of tendon sheath, left upper arm | ✓ |
| M65.22 | Calcific tendinitis, upper arm | — |
| M65.22 | Calcific tendinitis, upper arm | — |
| M65.23 | Calcific tendinitis, forearm | — |
| M65.23 | Calcific tendinitis, forearm | — |
| M65.24 | Calcific tendinitis, hand | — |
| M65.24 | Calcific tendinitis, hand | — |
| M65.25 | Calcific tendinitis, thigh | — |
| M65.25 | Calcific tendinitis, thigh | — |
| M65.26 | Calcific tendinitis, lower leg | — |
| M65.26 | Calcific tendinitis, lower leg | — |
| M65.27 | Calcific tendinitis, ankle and foot | — |
| M65.27 | Calcific tendinitis, ankle and foot | — |
| M65.28 | Calcific tendinitis, other site | ✓ |
| M65.28 | Calcific tendinitis, other site | ✓ |
| M65.029 | Abscess of tendon sheath, unspecified upper arm | ✓ |
| M65.029 | Abscess of tendon sheath, unspecified upper arm | ✓ |
| M65.29 | Calcific tendinitis, multiple sites | ✓ |
| M65.29 | Calcific tendinitis, multiple sites | ✓ |
| M65.30 | Trigger finger, unspecified finger | ✓ |
| M65.30 | Trigger finger, unspecified finger | ✓ |
| M65.031 | Abscess of tendon sheath, right forearm | ✓ |
| M65.031 | Abscess of tendon sheath, right forearm | ✓ |
| M65.31 | Trigger thumb | — |
| M65.31 | Trigger thumb | — |
| M65.032 | Abscess of tendon sheath, left forearm | ✓ |
| M65.032 | Abscess of tendon sheath, left forearm | ✓ |
| M65.32 | Trigger finger, index finger | — |
| M65.32 | Trigger finger, index finger | — |
| M65.33 | Trigger finger, middle finger | — |
| M65.33 | Trigger finger, middle finger | — |
| M65.34 | Trigger finger, ring finger | — |
| M65.34 | Trigger finger, ring finger | — |
| M65.35 | Trigger finger, little finger | — |
| M65.35 | Trigger finger, little finger | — |
| M65.039 | Abscess of tendon sheath, unspecified forearm | ✓ |
| M65.039 | Abscess of tendon sheath, unspecified forearm | ✓ |
| M65.041 | Abscess of tendon sheath, right hand | ✓ |
| M65.041 | Abscess of tendon sheath, right hand | ✓ |
| M65.042 | Abscess of tendon sheath, left hand | ✓ |
| M65.042 | Abscess of tendon sheath, left hand | ✓ |
| M65.049 | Abscess of tendon sheath, unspecified hand | ✓ |
| M65.049 | Abscess of tendon sheath, unspecified hand | ✓ |
| M65.051 | Abscess of tendon sheath, right thigh | ✓ |
| M65.051 | Abscess of tendon sheath, right thigh | ✓ |
| M65.052 | Abscess of tendon sheath, left thigh | ✓ |
| M65.052 | Abscess of tendon sheath, left thigh | ✓ |
| M65.059 | Abscess of tendon sheath, unspecified thigh | ✓ |
| M65.059 | Abscess of tendon sheath, unspecified thigh | ✓ |
| M65.061 | Abscess of tendon sheath, right lower leg | ✓ |
| M65.061 | Abscess of tendon sheath, right lower leg | ✓ |
| M65.062 | Abscess of tendon sheath, left lower leg | ✓ |
| M65.062 | Abscess of tendon sheath, left lower leg | ✓ |
| M65.069 | Abscess of tendon sheath, unspecified lower leg | ✓ |
| M65.069 | Abscess of tendon sheath, unspecified lower leg | ✓ |
| M65.071 | Abscess of tendon sheath, right ankle and foot | ✓ |
| M65.071 | Abscess of tendon sheath, right ankle and foot | ✓ |
| M65.072 | Abscess of tendon sheath, left ankle and foot | ✓ |
| M65.072 | Abscess of tendon sheath, left ankle and foot | ✓ |
| M65.079 | Abscess of tendon sheath, unspecified ankle and foot | ✓ |
| M65.079 | Abscess of tendon sheath, unspecified ankle and foot | ✓ |
| M65.80 | Other synovitis and tenosynovitis, unspecified site | ✓ |
| M65.80 | Other synovitis and tenosynovitis, unspecified site | ✓ |
| M65.81 | Other synovitis and tenosynovitis, shoulder | — |
| M65.81 | Other synovitis and tenosynovitis, shoulder | — |
| M65.82 | Other synovitis and tenosynovitis, upper arm | — |
| M65.82 | Other synovitis and tenosynovitis, upper arm | — |
| M65.83 | Other synovitis and tenosynovitis, forearm | — |
| M65.83 | Other synovitis and tenosynovitis, forearm | — |
| M65.84 | Other synovitis and tenosynovitis, hand | — |
| M65.84 | Other synovitis and tenosynovitis, hand | — |
| M65.85 | Other synovitis and tenosynovitis, thigh | — |
| M65.85 | Other synovitis and tenosynovitis, thigh | — |
| M65.86 | Other synovitis and tenosynovitis, lower leg | — |
| M65.86 | Other synovitis and tenosynovitis, lower leg | — |
| M65.87 | Other synovitis and tenosynovitis, ankle and foot | — |
| M65.87 | Other synovitis and tenosynovitis, ankle and foot | — |
| M65.88 | Other synovitis and tenosynovitis, other site | ✓ |
| M65.88 | Other synovitis and tenosynovitis, other site | ✓ |
| M65.89 | Other synovitis and tenosynovitis, multiple sites | ✓ |
| M65.89 | Other synovitis and tenosynovitis, multiple sites | ✓ |
| M65.90 | Unspecified synovitis and tenosynovitis, unspecified site | ✓ |
| M65.90 | Unspecified synovitis and tenosynovitis, unspecified site | ✓ |
| M65.91 | Unspecified synovitis and tenosynovitis, shoulder | — |
| M65.91 | Unspecified synovitis and tenosynovitis, shoulder | — |
| M65.92 | Unspecified synovitis and tenosynovitis, upper arm | — |
| M65.92 | Unspecified synovitis and tenosynovitis, upper arm | — |
| M65.93 | Unspecified synovitis and tenosynovitis, forearm | — |
| M65.93 | Unspecified synovitis and tenosynovitis, forearm | — |
| M65.94 | Unspecified synovitis and tenosynovitis, hand | — |
| M65.94 | Unspecified synovitis and tenosynovitis, hand | — |
| M65.95 | Unspecified synovitis and tenosynovitis, thigh | — |
| M65.95 | Unspecified synovitis and tenosynovitis, thigh | — |
| M65.96 | Unspecified synovitis and tenosynovitis, lower leg | — |
| M65.96 | Unspecified synovitis and tenosynovitis, lower leg | — |
| M65.97 | Unspecified synovitis and tenosynovitis, ankle and foot | — |
| M65.97 | Unspecified synovitis and tenosynovitis, ankle and foot | — |
| M65.98 | Unspecified synovitis and tenosynovitis, other site | ✓ |
| M65.98 | Unspecified synovitis and tenosynovitis, other site | ✓ |
| M65.99 | Unspecified synovitis and tenosynovitis, multiple sites | ✓ |
| M65.99 | Unspecified synovitis and tenosynovitis, multiple sites | ✓ |
| M65.111 | Other infective (teno)synovitis, right shoulder | ✓ |
| M65.111 | Other infective (teno)synovitis, right shoulder | ✓ |
| M65.112 | Other infective (teno)synovitis, left shoulder | ✓ |
| M65.112 | Other infective (teno)synovitis, left shoulder | ✓ |
| M65.119 | Other infective (teno)synovitis, unspecified shoulder | ✓ |
| M65.119 | Other infective (teno)synovitis, unspecified shoulder | ✓ |
| M65.121 | Other infective (teno)synovitis, right elbow | ✓ |
| M65.121 | Other infective (teno)synovitis, right elbow | ✓ |
| M65.122 | Other infective (teno)synovitis, left elbow | ✓ |
| M65.122 | Other infective (teno)synovitis, left elbow | ✓ |
| M65.129 | Other infective (teno)synovitis, unspecified elbow | ✓ |
| M65.129 | Other infective (teno)synovitis, unspecified elbow | ✓ |
| M65.131 | Other infective (teno)synovitis, right wrist | ✓ |
| M65.131 | Other infective (teno)synovitis, right wrist | ✓ |
| M65.132 | Other infective (teno)synovitis, left wrist | ✓ |
| M65.132 | Other infective (teno)synovitis, left wrist | ✓ |
| M65.139 | Other infective (teno)synovitis, unspecified wrist | ✓ |
| M65.139 | Other infective (teno)synovitis, unspecified wrist | ✓ |
| M65.141 | Other infective (teno)synovitis, right hand | ✓ |
| M65.141 | Other infective (teno)synovitis, right hand | ✓ |
| M65.142 | Other infective (teno)synovitis, left hand | ✓ |
| M65.142 | Other infective (teno)synovitis, left hand | ✓ |
| M65.149 | Other infective (teno)synovitis, unspecified hand | ✓ |
| M65.149 | Other infective (teno)synovitis, unspecified hand | ✓ |
| M65.151 | Other infective (teno)synovitis, right hip | ✓ |
| M65.151 | Other infective (teno)synovitis, right hip | ✓ |
| M65.152 | Other infective (teno)synovitis, left hip | ✓ |
| M65.152 | Other infective (teno)synovitis, left hip | ✓ |
| M65.159 | Other infective (teno)synovitis, unspecified hip | ✓ |
| M65.159 | Other infective (teno)synovitis, unspecified hip | ✓ |
| M65.161 | Other infective (teno)synovitis, right knee | ✓ |
| M65.161 | Other infective (teno)synovitis, right knee | ✓ |
| M65.162 | Other infective (teno)synovitis, left knee | ✓ |
| M65.162 | Other infective (teno)synovitis, left knee | ✓ |
| M65.169 | Other infective (teno)synovitis, unspecified knee | ✓ |
| M65.169 | Other infective (teno)synovitis, unspecified knee | ✓ |
| M65.171 | Other infective (teno)synovitis, right ankle and foot | ✓ |
| M65.171 | Other infective (teno)synovitis, right ankle and foot | ✓ |
| M65.172 | Other infective (teno)synovitis, left ankle and foot | ✓ |
| M65.172 | Other infective (teno)synovitis, left ankle and foot | ✓ |
| M65.179 | Other infective (teno)synovitis, unspecified ankle and foot | ✓ |
| M65.179 | Other infective (teno)synovitis, unspecified ankle and foot | ✓ |
| M65.221 | Calcific tendinitis, right upper arm | ✓ |
| M65.221 | Calcific tendinitis, right upper arm | ✓ |
| M65.222 | Calcific tendinitis, left upper arm | ✓ |
| M65.222 | Calcific tendinitis, left upper arm | ✓ |
| M65.229 | Calcific tendinitis, unspecified upper arm | ✓ |
| M65.229 | Calcific tendinitis, unspecified upper arm | ✓ |
| M65.231 | Calcific tendinitis, right forearm | ✓ |
| M65.231 | Calcific tendinitis, right forearm | ✓ |
| M65.232 | Calcific tendinitis, left forearm | ✓ |
| M65.232 | Calcific tendinitis, left forearm | ✓ |
| M65.239 | Calcific tendinitis, unspecified forearm | ✓ |
| M65.239 | Calcific tendinitis, unspecified forearm | ✓ |
| M65.241 | Calcific tendinitis, right hand | ✓ |
| M65.241 | Calcific tendinitis, right hand | ✓ |
| M65.242 | Calcific tendinitis, left hand | ✓ |
| M65.242 | Calcific tendinitis, left hand | ✓ |
| M65.249 | Calcific tendinitis, unspecified hand | ✓ |
| M65.249 | Calcific tendinitis, unspecified hand | ✓ |
| M65.251 | Calcific tendinitis, right thigh | ✓ |
| M65.251 | Calcific tendinitis, right thigh | ✓ |
| M65.252 | Calcific tendinitis, left thigh | ✓ |
| M65.252 | Calcific tendinitis, left thigh | ✓ |
| M65.259 | Calcific tendinitis, unspecified thigh | ✓ |
| M65.259 | Calcific tendinitis, unspecified thigh | ✓ |
| M65.261 | Calcific tendinitis, right lower leg | ✓ |
| M65.261 | Calcific tendinitis, right lower leg | ✓ |
| M65.262 | Calcific tendinitis, left lower leg | ✓ |
| M65.262 | Calcific tendinitis, left lower leg | ✓ |
| M65.269 | Calcific tendinitis, unspecified lower leg | ✓ |
| M65.269 | Calcific tendinitis, unspecified lower leg | ✓ |
| M65.271 | Calcific tendinitis, right ankle and foot | ✓ |
| M65.271 | Calcific tendinitis, right ankle and foot | ✓ |
| M65.272 | Calcific tendinitis, left ankle and foot | ✓ |
| M65.272 | Calcific tendinitis, left ankle and foot | ✓ |
| M65.279 | Calcific tendinitis, unspecified ankle and foot | ✓ |
| M65.279 | Calcific tendinitis, unspecified ankle and foot | ✓ |
| M65.311 | Trigger thumb, right thumb | ✓ |
| M65.311 | Trigger thumb, right thumb | ✓ |
| M65.312 | Trigger thumb, left thumb | ✓ |
| M65.312 | Trigger thumb, left thumb | ✓ |
| M65.319 | Trigger thumb, unspecified thumb | ✓ |
| M65.319 | Trigger thumb, unspecified thumb | ✓ |
| M65.321 | Trigger finger, right index finger | ✓ |
| M65.321 | Trigger finger, right index finger | ✓ |
| M65.322 | Trigger finger, left index finger | ✓ |
| M65.322 | Trigger finger, left index finger | ✓ |
| M65.329 | Trigger finger, unspecified index finger | ✓ |
| M65.329 | Trigger finger, unspecified index finger | ✓ |
| M65.331 | Trigger finger, right middle finger | ✓ |
| M65.331 | Trigger finger, right middle finger | ✓ |
| M65.332 | Trigger finger, left middle finger | ✓ |
| M65.332 | Trigger finger, left middle finger | ✓ |
| M65.339 | Trigger finger, unspecified middle finger | ✓ |
| M65.339 | Trigger finger, unspecified middle finger | ✓ |
| M65.341 | Trigger finger, right ring finger | ✓ |
| M65.341 | Trigger finger, right ring finger | ✓ |
| M65.342 | Trigger finger, left ring finger | ✓ |
| M65.342 | Trigger finger, left ring finger | ✓ |
| M65.349 | Trigger finger, unspecified ring finger | ✓ |
| M65.349 | Trigger finger, unspecified ring finger | ✓ |
| M65.351 | Trigger finger, right little finger | ✓ |
| M65.351 | Trigger finger, right little finger | ✓ |
| M65.352 | Trigger finger, left little finger | ✓ |
| M65.352 | Trigger finger, left little finger | ✓ |
| M65.359 | Trigger finger, unspecified little finger | ✓ |
| M65.359 | Trigger finger, unspecified little finger | ✓ |
| M65.811 | Other synovitis and tenosynovitis, right shoulder | ✓ |
| M65.811 | Other synovitis and tenosynovitis, right shoulder | ✓ |
| M65.812 | Other synovitis and tenosynovitis, left shoulder | ✓ |
| M65.812 | Other synovitis and tenosynovitis, left shoulder | ✓ |
| M65.819 | Other synovitis and tenosynovitis, unspecified shoulder | ✓ |
| M65.819 | Other synovitis and tenosynovitis, unspecified shoulder | ✓ |
| M65.821 | Other synovitis and tenosynovitis, right upper arm | ✓ |
| M65.821 | Other synovitis and tenosynovitis, right upper arm | ✓ |
| M65.822 | Other synovitis and tenosynovitis, left upper arm | ✓ |
| M65.822 | Other synovitis and tenosynovitis, left upper arm | ✓ |
| M65.829 | Other synovitis and tenosynovitis, unspecified upper arm | ✓ |
| M65.829 | Other synovitis and tenosynovitis, unspecified upper arm | ✓ |
| M65.831 | Other synovitis and tenosynovitis, right forearm | ✓ |
| M65.831 | Other synovitis and tenosynovitis, right forearm | ✓ |
| M65.832 | Other synovitis and tenosynovitis, left forearm | ✓ |
| M65.832 | Other synovitis and tenosynovitis, left forearm | ✓ |
| M65.839 | Other synovitis and tenosynovitis, unspecified forearm | ✓ |
| M65.839 | Other synovitis and tenosynovitis, unspecified forearm | ✓ |
| M65.841 | Other synovitis and tenosynovitis, right hand | ✓ |
| M65.841 | Other synovitis and tenosynovitis, right hand | ✓ |
| M65.842 | Other synovitis and tenosynovitis, left hand | ✓ |
| M65.842 | Other synovitis and tenosynovitis, left hand | ✓ |
| M65.849 | Other synovitis and tenosynovitis, unspecified hand | ✓ |
| M65.849 | Other synovitis and tenosynovitis, unspecified hand | ✓ |
| M65.851 | Other synovitis and tenosynovitis, right thigh | ✓ |
| M65.851 | Other synovitis and tenosynovitis, right thigh | ✓ |
| M65.852 | Other synovitis and tenosynovitis, left thigh | ✓ |
| M65.852 | Other synovitis and tenosynovitis, left thigh | ✓ |
| M65.859 | Other synovitis and tenosynovitis, unspecified thigh | ✓ |
| M65.859 | Other synovitis and tenosynovitis, unspecified thigh | ✓ |
| M65.861 | Other synovitis and tenosynovitis, right lower leg | ✓ |
| M65.861 | Other synovitis and tenosynovitis, right lower leg | ✓ |
| M65.862 | Other synovitis and tenosynovitis, left lower leg | ✓ |
| M65.862 | Other synovitis and tenosynovitis, left lower leg | ✓ |
| M65.869 | Other synovitis and tenosynovitis, unspecified lower leg | ✓ |
| M65.869 | Other synovitis and tenosynovitis, unspecified lower leg | ✓ |
| M65.871 | Other synovitis and tenosynovitis, right ankle and foot | ✓ |
| M65.871 | Other synovitis and tenosynovitis, right ankle and foot | ✓ |
| M65.872 | Other synovitis and tenosynovitis, left ankle and foot | ✓ |
| M65.872 | Other synovitis and tenosynovitis, left ankle and foot | ✓ |
| M65.879 | Other synovitis and tenosynovitis, unspecified ankle and foot | ✓ |
| M65.879 | Other synovitis and tenosynovitis, unspecified ankle and foot | ✓ |
| M65.911 | Unspecified synovitis and tenosynovitis, right shoulder | ✓ |
| M65.911 | Unspecified synovitis and tenosynovitis, right shoulder | ✓ |
| M65.912 | Unspecified synovitis and tenosynovitis, left shoulder | ✓ |
| M65.912 | Unspecified synovitis and tenosynovitis, left shoulder | ✓ |
| M65.919 | Unspecified synovitis and tenosynovitis, unspecified shoulder | ✓ |
| M65.919 | Unspecified synovitis and tenosynovitis, unspecified shoulder | ✓ |
| M65.921 | Unspecified synovitis and tenosynovitis, right upper arm | ✓ |
| M65.921 | Unspecified synovitis and tenosynovitis, right upper arm | ✓ |
| M65.922 | Unspecified synovitis and tenosynovitis, left upper arm | ✓ |
| M65.922 | Unspecified synovitis and tenosynovitis, left upper arm | ✓ |
| M65.929 | Unspecified synovitis and tenosynovitis, unspecified upper arm | ✓ |
| M65.929 | Unspecified synovitis and tenosynovitis, unspecified upper arm | ✓ |
| M65.931 | Unspecified synovitis and tenosynovitis, right forearm | ✓ |
| M65.931 | Unspecified synovitis and tenosynovitis, right forearm | ✓ |
| M65.932 | Unspecified synovitis and tenosynovitis, left forearm | ✓ |
| M65.932 | Unspecified synovitis and tenosynovitis, left forearm | ✓ |
| M65.939 | Unspecified synovitis and tenosynovitis, unspecified forearm | ✓ |
| M65.939 | Unspecified synovitis and tenosynovitis, unspecified forearm | ✓ |
| M65.941 | Unspecified synovitis and tenosynovitis, right hand | ✓ |
| M65.941 | Unspecified synovitis and tenosynovitis, right hand | ✓ |
| M65.942 | Unspecified synovitis and tenosynovitis, left hand | ✓ |
| M65.942 | Unspecified synovitis and tenosynovitis, left hand | ✓ |
| M65.949 | Unspecified synovitis and tenosynovitis, unspecified hand | ✓ |
| M65.949 | Unspecified synovitis and tenosynovitis, unspecified hand | ✓ |
| M65.951 | Unspecified synovitis and tenosynovitis, right thigh | ✓ |
| M65.951 | Unspecified synovitis and tenosynovitis, right thigh | ✓ |
| M65.952 | Unspecified synovitis and tenosynovitis, left thigh | ✓ |
| M65.952 | Unspecified synovitis and tenosynovitis, left thigh | ✓ |
| M65.959 | Unspecified synovitis and tenosynovitis, unspecified thigh | ✓ |
| M65.959 | Unspecified synovitis and tenosynovitis, unspecified thigh | ✓ |
| M65.961 | Unspecified synovitis and tenosynovitis, right lower leg | ✓ |
| M65.961 | Unspecified synovitis and tenosynovitis, right lower leg | ✓ |
| M65.962 | Unspecified synovitis and tenosynovitis, left lower leg | ✓ |
| M65.962 | Unspecified synovitis and tenosynovitis, left lower leg | ✓ |
| M65.969 | Unspecified synovitis and tenosynovitis, unspecified lower leg | ✓ |
| M65.969 | Unspecified synovitis and tenosynovitis, unspecified lower leg | ✓ |
| M65.971 | Unspecified synovitis and tenosynovitis, right ankle and foot | ✓ |
| M65.971 | Unspecified synovitis and tenosynovitis, right ankle and foot | ✓ |
| M65.972 | Unspecified synovitis and tenosynovitis, left ankle and foot | ✓ |
| M65.972 | Unspecified synovitis and tenosynovitis, left ankle and foot | ✓ |
| M65.979 | Unspecified synovitis and tenosynovitis, unspecified ankle and foot | ✓ |
| M65.979 | Unspecified synovitis and tenosynovitis, unspecified ankle and foot | ✓ |
Frequently asked questions
What is ICD-10-CM code M65?
M65 is an ICD-10-CM category covering Synovitis and tenosynovitis. It contains 356 more specific diagnosis codes, 266 of which are billable.
Is M65 a billable code?
No — M65 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M65.0 — Abscess of tendon sheath). 266 of the 356 codes under M65 are billable.
What codes fall under M65?
M65 includes M65.0, M65.0, M65.00, M65.00, M65.01, plus 351 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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