ICD-10-CM M65: Synovitis and tenosynovitis

ICD-10-CM Diagnosis Code (2025)

Official Description for M65

Synovitis and tenosynovitis

Coding Notes & Guidelines for 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.-)
Excludes1: Not Coded Here
  • tendinitis as classified in M75-M77
  • calcified tendinitis of shoulder (M75.3)
Use Additional Code

code (B95-B96) to identify bacterial agent.

Inclusion Terms

Nodular tendinous disease

Child Codes (More Specific Codes for M65):

M65.0 - Abscess of tendon sheath M65.00 - Abscess of tendon sheath, unspecified site M65.01 - Abscess of tendon sheath, shoulder M65.011 - Abscess of tendon sheath, right shoulder M65.012 - Abscess of tendon sheath, left shoulder M65.019 - Abscess of tendon sheath, unspecified shoulder M65.02 - Abscess of tendon sheath, upper arm M65.021 - Abscess of tendon sheath, right upper arm M65.022 - Abscess of tendon sheath, left upper arm M65.029 - Abscess of tendon sheath, unspecified upper arm M65.03 - Abscess of tendon sheath, forearm M65.031 - Abscess of tendon sheath, right forearm M65.032 - Abscess of tendon sheath, left forearm M65.039 - Abscess of tendon sheath, unspecified forearm M65.04 - Abscess of tendon sheath, hand M65.041 - Abscess of tendon sheath, right hand M65.042 - Abscess of tendon sheath, left hand M65.049 - Abscess of tendon sheath, unspecified hand M65.05 - Abscess of tendon sheath, thigh M65.051 - Abscess of tendon sheath, right thigh M65.052 - Abscess of tendon sheath, left thigh M65.059 - Abscess of tendon sheath, unspecified thigh M65.06 - Abscess of tendon sheath, lower leg M65.061 - Abscess of tendon sheath, right lower leg M65.062 - Abscess of tendon sheath, left lower leg M65.069 - Abscess of tendon sheath, unspecified lower leg M65.07 - Abscess of tendon sheath, ankle and foot M65.071 - Abscess of tendon sheath, right ankle and foot M65.072 - Abscess of tendon sheath, left ankle and foot M65.079 - Abscess of tendon sheath, unspecified ankle and foot M65.08 - Abscess of tendon sheath, other site M65.1 - Other infective (teno)synovitis M65.10 - Other infective (teno)synovitis, unspecified site M65.11 - Other infective (teno)synovitis, shoulder M65.111 - Other infective (teno)synovitis, right shoulder M65.112 - Other infective (teno)synovitis, left shoulder M65.119 - Other infective (teno)synovitis, unspecified shoulder M65.12 - Other infective (teno)synovitis, elbow M65.121 - Other infective (teno)synovitis, right elbow M65.122 - Other infective (teno)synovitis, left elbow M65.129 - Other infective (teno)synovitis, unspecified elbow M65.13 - Other infective (teno)synovitis, wrist M65.131 - Other infective (teno)synovitis, right wrist M65.132 - Other infective (teno)synovitis, left wrist M65.139 - Other infective (teno)synovitis, unspecified wrist M65.14 - Other infective (teno)synovitis, hand M65.141 - Other infective (teno)synovitis, right hand M65.142 - Other infective (teno)synovitis, left hand M65.149 - Other infective (teno)synovitis, unspecified hand M65.15 - Other infective (teno)synovitis, hip M65.151 - Other infective (teno)synovitis, right hip M65.152 - Other infective (teno)synovitis, left hip M65.159 - Other infective (teno)synovitis, unspecified hip M65.16 - Other infective (teno)synovitis, knee M65.161 - Other infective (teno)synovitis, right knee M65.162 - Other infective (teno)synovitis, left knee M65.169 - Other infective (teno)synovitis, unspecified knee M65.17 - Other infective (teno)synovitis, ankle and foot M65.171 - Other infective (teno)synovitis, right ankle and foot M65.172 - Other infective (teno)synovitis, left ankle and foot M65.179 - Other infective (teno)synovitis, unspecified ankle and foot M65.18 - Other infective (teno)synovitis, other site M65.19 - Other infective (teno)synovitis, multiple sites M65.2 - Calcific tendinitis M65.20 - Calcific tendinitis, unspecified site M65.22 - Calcific tendinitis, upper arm M65.221 - Calcific tendinitis, right upper arm M65.222 - Calcific tendinitis, left upper arm M65.229 - Calcific tendinitis, unspecified upper arm M65.23 - Calcific tendinitis, forearm M65.231 - Calcific tendinitis, right forearm M65.232 - Calcific tendinitis, left forearm M65.239 - Calcific tendinitis, unspecified forearm M65.24 - Calcific tendinitis, hand M65.241 - Calcific tendinitis, right hand M65.242 - Calcific tendinitis, left hand M65.249 - Calcific tendinitis, unspecified hand M65.25 - Calcific tendinitis, thigh M65.251 - Calcific tendinitis, right thigh M65.252 - Calcific tendinitis, left thigh M65.259 - Calcific tendinitis, unspecified thigh M65.26 - Calcific tendinitis, lower leg M65.261 - Calcific tendinitis, right lower leg M65.262 - Calcific tendinitis, left lower leg M65.269 - Calcific tendinitis, unspecified lower leg M65.27 - Calcific tendinitis, ankle and foot M65.271 - Calcific tendinitis, right ankle and foot M65.272 - Calcific tendinitis, left ankle and foot M65.279 - Calcific tendinitis, unspecified ankle and foot M65.28 - Calcific tendinitis, other site M65.29 - Calcific tendinitis, multiple sites M65.3 - Trigger finger M65.30 - Trigger finger, unspecified finger M65.31 - Trigger thumb M65.311 - Trigger thumb, right thumb M65.312 - Trigger thumb, left thumb M65.319 - Trigger thumb, unspecified thumb M65.32 - Trigger finger, index finger M65.321 - Trigger finger, right index finger M65.322 - Trigger finger, left index finger M65.329 - Trigger finger, unspecified index finger M65.33 - Trigger finger, middle finger M65.331 - Trigger finger, right middle finger M65.332 - Trigger finger, left middle finger M65.339 - Trigger finger, unspecified middle finger M65.34 - Trigger finger, ring finger M65.341 - Trigger finger, right ring finger M65.342 - Trigger finger, left ring finger M65.349 - Trigger finger, unspecified ring finger M65.35 - Trigger finger, little finger M65.351 - Trigger finger, right little finger M65.352 - Trigger finger, left little finger M65.359 - Trigger finger, unspecified little finger M65.4 - Radial styloid tenosynovitis [de Quervain] M65.8 - Other synovitis and tenosynovitis M65.80 - Other synovitis and tenosynovitis, unspecified site M65.81 - Other synovitis and tenosynovitis, shoulder M65.811 - Other synovitis and tenosynovitis, right shoulder M65.812 - Other synovitis and tenosynovitis, left shoulder M65.819 - Other synovitis and tenosynovitis, unspecified shoulder M65.82 - Other synovitis and tenosynovitis, upper arm M65.821 - Other synovitis and tenosynovitis, right upper arm M65.822 - Other synovitis and tenosynovitis, left upper arm M65.829 - Other synovitis and tenosynovitis, unspecified upper arm M65.83 - Other synovitis and tenosynovitis, forearm M65.831 - Other synovitis and tenosynovitis, right forearm M65.832 - Other synovitis and tenosynovitis, left forearm M65.839 - Other synovitis and tenosynovitis, unspecified forearm M65.84 - Other synovitis and tenosynovitis, hand M65.841 - Other synovitis and tenosynovitis, right hand M65.842 - Other synovitis and tenosynovitis, left hand M65.849 - Other synovitis and tenosynovitis, unspecified hand M65.85 - Other synovitis and tenosynovitis, thigh M65.851 - Other synovitis and tenosynovitis, right thigh M65.852 - Other synovitis and tenosynovitis, left thigh M65.859 - Other synovitis and tenosynovitis, unspecified thigh M65.86 - Other synovitis and tenosynovitis, lower leg M65.861 - Other synovitis and tenosynovitis, right lower leg M65.862 - Other synovitis and tenosynovitis, left lower leg M65.869 - Other synovitis and tenosynovitis, unspecified lower leg M65.87 - Other synovitis and tenosynovitis, ankle and foot M65.871 - Other synovitis and tenosynovitis, right ankle and foot M65.872 - Other synovitis and tenosynovitis, left ankle and foot M65.879 - Other synovitis and tenosynovitis, unspecified ankle and foot M65.88 - Other synovitis and tenosynovitis, other site M65.89 - Other synovitis and tenosynovitis, multiple sites M65.9 - Synovitis and tenosynovitis, unspecified M65.90 - Unspecified synovitis and tenosynovitis, unspecified site M65.91 - Unspecified synovitis and tenosynovitis, shoulder M65.911 - Unspecified synovitis and tenosynovitis, right shoulder M65.912 - Unspecified synovitis and tenosynovitis, left shoulder M65.919 - Unspecified synovitis and tenosynovitis, unspecified shoulder M65.92 - Unspecified synovitis and tenosynovitis, upper arm M65.921 - Unspecified synovitis and tenosynovitis, right upper arm M65.922 - Unspecified synovitis and tenosynovitis, left upper arm M65.929 - Unspecified synovitis and tenosynovitis, unspecified upper arm M65.93 - Unspecified synovitis and tenosynovitis, forearm M65.931 - Unspecified synovitis and tenosynovitis, right forearm M65.932 - Unspecified synovitis and tenosynovitis, left forearm M65.939 - Unspecified synovitis and tenosynovitis, unspecified forearm M65.94 - Unspecified synovitis and tenosynovitis, hand M65.941 - Unspecified synovitis and tenosynovitis, right hand M65.942 - Unspecified synovitis and tenosynovitis, left hand M65.949 - Unspecified synovitis and tenosynovitis, unspecified hand M65.95 - Unspecified synovitis and tenosynovitis, thigh M65.951 - Unspecified synovitis and tenosynovitis, right thigh M65.952 - Unspecified synovitis and tenosynovitis, left thigh M65.959 - Unspecified synovitis and tenosynovitis, unspecified thigh M65.96 - Unspecified synovitis and tenosynovitis, lower leg M65.961 - Unspecified synovitis and tenosynovitis, right lower leg M65.962 - Unspecified synovitis and tenosynovitis, left lower leg M65.969 - Unspecified synovitis and tenosynovitis, unspecified lower leg M65.97 - Unspecified synovitis and tenosynovitis, ankle and foot M65.971 - Unspecified synovitis and tenosynovitis, right ankle and foot M65.972 - Unspecified synovitis and tenosynovitis, left ankle and foot M65.979 - Unspecified synovitis and tenosynovitis, unspecified ankle and foot M65.98 - Unspecified synovitis and tenosynovitis, other site M65.99 - Unspecified synovitis and tenosynovitis, multiple sites

About ICD-10-CM Code M65 (Synovitis and tenosynovitis)

ICD-10-CM code M65 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM M65 became effective on October 1, 2024.

This page provides detailed information about M65 - Synovitis and tenosynovitis. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Synovitis and tenosynovitis.