ICD-10-CM Tabular Index · Chapter 13 · FY 2027 M65
Synovitis and tenosynovitis (M65) ICD-10-CM
The M65 code range covers synovitis and tenosynovitis with 179 ICD-10-CM diagnosis codes. 133 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
179
Diagnosis Codes
133
Billable Codes
M65
Code Range
M65–M67
Parent Section
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
ICD-10-CM
Codes in the M65 Range 179 codes · 133 billable
179 of 179 shown
- M65 Synovitis and tenosynovitisNon-billable
- M65.0 Abscess of tendon sheathNon-billable
- M65.00 Abscess of tendon sheath, unspecified site
- M65.01 Abscess of tendon sheath, shoulderNon-billable
- 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 armNon-billable
- 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, forearmNon-billable
- 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, handNon-billable
- 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, thighNon-billable
- 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 legNon-billable
- 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 footNon-billable
- 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)synovitisNon-billable
- M65.10 Other infective (teno)synovitis, unspecified site
- M65.11 Other infective (teno)synovitis, shoulderNon-billable
- 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, elbowNon-billable
- 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, wristNon-billable
- 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, handNon-billable
- 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, hipNon-billable
- 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, kneeNon-billable
- 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 footNon-billable
- 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 tendinitisNon-billable
- M65.20 Calcific tendinitis, unspecified site
- M65.22 Calcific tendinitis, upper armNon-billable
- 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, forearmNon-billable
- M65.231 Calcific tendinitis, right forearm
- M65.232 Calcific tendinitis, left forearm
- M65.239 Calcific tendinitis, unspecified forearm
- M65.24 Calcific tendinitis, handNon-billable
- M65.241 Calcific tendinitis, right hand
- M65.242 Calcific tendinitis, left hand
- M65.249 Calcific tendinitis, unspecified hand
- M65.25 Calcific tendinitis, thighNon-billable
- M65.251 Calcific tendinitis, right thigh
- M65.252 Calcific tendinitis, left thigh
- M65.259 Calcific tendinitis, unspecified thigh
- M65.26 Calcific tendinitis, lower legNon-billable
- 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 footNon-billable
- 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 fingerNon-billable
- M65.30 Trigger finger, unspecified finger
- M65.31 Trigger thumbNon-billable
- M65.311 Trigger thumb, right thumb
- M65.312 Trigger thumb, left thumb
- M65.319 Trigger thumb, unspecified thumb
- M65.32 Trigger finger, index fingerNon-billable
- 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 fingerNon-billable
- 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 fingerNon-billable
- 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 fingerNon-billable
- 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 tenosynovitisNon-billable
- M65.80 Other synovitis and tenosynovitis, unspecified site
- M65.81 Other synovitis and tenosynovitis, shoulderNon-billable
- 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 armNon-billable
- 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, forearmNon-billable
- 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, handNon-billable
- 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, thighNon-billable
- 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 legNon-billable
- 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 footNon-billable
- 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, unspecifiedNon-billable
- M65.90 Unspecified synovitis and tenosynovitis, unspecified site
- M65.91 Unspecified synovitis and tenosynovitis, shoulderNon-billable
- 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 armNon-billable
- 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, forearmNon-billable
- 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, handNon-billable
- 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, thighNon-billable
- 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 legNon-billable
- 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 footNon-billable
- 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the M65 range.
Synovitis
Inflammation of the SYNOVIAL MEMBRANE.
Tenosynovitis
Inflammation of the synovial lining of a tendon sheath. Causes include trauma, tendon stress, bacterial disease (gonorrhea, tuberculosis), rheumatic disease, and gout. Common sites are the hand, wrist, shoulder capsule, hip capsule, hamstring muscles, and Achilles tendon. The tendon sheaths become inflamed and painful, and accumulate fluid. Joint mobility is usually reduced.
About the M65 Code Range
Synovitis and tenosynovitis appear here alongside tendon-sheath abscesses, calcific tendinitis, and trigger finger.
The subdivisions separate tendon-sheath abscesses (M65.0), other infective forms (M65.1), and calcific tendinitis (M65.2). Trigger finger (M65.3) is divided by finger. Radial styloid tenosynovitis, also called de Quervain, has its own subdivision (M65.4). Other and unspecified forms have separate subdivisions (M65.8 and M65.9). Most subdivisions further distinguish the affected site; some also distinguish multiple sites.
Questions About This Page
How many billable codes are in the M65 range?
Of the 179 codes in this range, 133 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the M65 range classify?
The range classifies synovitis and tenosynovitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
All ICD-10-CM ChaptersAll of Chapter 13ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
