ICD-10 · PDGM grouping
M65 Synovitis and tenosynovitis
All 133 codes in the M65 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
133
Can lead a claim
72
Cannot lead a claim
61
What CMS assigns to M65
72 of the 133 codes group to Musculoskeletal Rehabilitation; 61 are assigned no clinical group. None of the 133 is assigned a comorbidity subgroup. 72 of the 133 can lead a claim.
Every code in M65
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| M65.0 Abscess of tendon sheath | ||||
| M65.00 | Abscess of tendon sheath, unspecified site | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.01 Abscess of tendon sheath, shoulder | ||||
| M65.011 | Abscess of tendon sheath, right shoulder | Can lead a claim | E | None |
| M65.012 | Abscess of tendon sheath, left shoulder | Can lead a claim | E | None |
| M65.019 | Abscess of tendon sheath, unspecified shoulder | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.02 Abscess of tendon sheath, upper arm | ||||
| M65.021 | Abscess of tendon sheath, right upper arm | Can lead a claim | E | None |
| M65.022 | Abscess of tendon sheath, left upper arm | Can lead a claim | E | None |
| M65.029 | Abscess of tendon sheath, unspecified upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.03 Abscess of tendon sheath, forearm | ||||
| M65.031 | Abscess of tendon sheath, right forearm | Can lead a claim | E | None |
| M65.032 | Abscess of tendon sheath, left forearm | Can lead a claim | E | None |
| M65.039 | Abscess of tendon sheath, unspecified forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.04 Abscess of tendon sheath, hand | ||||
| M65.041 | Abscess of tendon sheath, right hand | Can lead a claim | E | None |
| M65.042 | Abscess of tendon sheath, left hand | Can lead a claim | E | None |
| M65.049 | Abscess of tendon sheath, unspecified hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.05 Abscess of tendon sheath, thigh | ||||
| M65.051 | Abscess of tendon sheath, right thigh | Can lead a claim | E | None |
| M65.052 | Abscess of tendon sheath, left thigh | Can lead a claim | E | None |
| M65.059 | Abscess of tendon sheath, unspecified thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.06 Abscess of tendon sheath, lower leg | ||||
| M65.061 | Abscess of tendon sheath, right lower leg | Can lead a claim | E | None |
| M65.062 | Abscess of tendon sheath, left lower leg | Can lead a claim | E | None |
| M65.069 | Abscess of tendon sheath, unspecified lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.07 Abscess of tendon sheath, ankle and foot | ||||
| M65.071 | Abscess of tendon sheath, right ankle and foot | Can lead a claim | E | None |
| M65.072 | Abscess of tendon sheath, left ankle and foot | Can lead a claim | E | None |
| M65.079 | Abscess of tendon sheath, unspecified ankle and foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.08 | Abscess of tendon sheath, other site | Can lead a claim | E | None |
| M65.1 Other infective (teno)synovitis | ||||
| M65.10 | Other infective (teno)synovitis, unspecified site | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.11 Other infective (teno)synovitis, shoulder | ||||
| M65.111 | Other infective (teno)synovitis, right shoulder | Can lead a claim | E | None |
| M65.112 | Other infective (teno)synovitis, left shoulder | Can lead a claim | E | None |
| M65.119 | Other infective (teno)synovitis, unspecified shoulder | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.12 Other infective (teno)synovitis, elbow | ||||
| M65.121 | Other infective (teno)synovitis, right elbow | Can lead a claim | E | None |
| M65.122 | Other infective (teno)synovitis, left elbow | Can lead a claim | E | None |
| M65.129 | Other infective (teno)synovitis, unspecified elbow | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.13 Other infective (teno)synovitis, wrist | ||||
| M65.131 | Other infective (teno)synovitis, right wrist | Can lead a claim | E | None |
| M65.132 | Other infective (teno)synovitis, left wrist | Can lead a claim | E | None |
| M65.139 | Other infective (teno)synovitis, unspecified wrist | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.14 Other infective (teno)synovitis, hand | ||||
| M65.141 | Other infective (teno)synovitis, right hand | Can lead a claim | E | None |
| M65.142 | Other infective (teno)synovitis, left hand | Can lead a claim | E | None |
| M65.149 | Other infective (teno)synovitis, unspecified hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.15 Other infective (teno)synovitis, hip | ||||
| M65.151 | Other infective (teno)synovitis, right hip | Can lead a claim | E | None |
| M65.152 | Other infective (teno)synovitis, left hip | Can lead a claim | E | None |
| M65.159 | Other infective (teno)synovitis, unspecified hip | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.16 Other infective (teno)synovitis, knee | ||||
| M65.161 | Other infective (teno)synovitis, right knee | Can lead a claim | E | None |
| M65.162 | Other infective (teno)synovitis, left knee | Can lead a claim | E | None |
| M65.169 | Other infective (teno)synovitis, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.17 Other infective (teno)synovitis, ankle and foot | ||||
| M65.171 | Other infective (teno)synovitis, right ankle and foot | Can lead a claim | E | None |
| M65.172 | Other infective (teno)synovitis, left ankle and foot | Can lead a claim | E | None |
| M65.179 | Other infective (teno)synovitis, unspecified ankle and foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.18 | Other infective (teno)synovitis, other site | Can lead a claim | E | None |
| M65.19 | Other infective (teno)synovitis, multiple sites | Can lead a claim | E | None |
| M65.2 Calcific tendinitis | ||||
| M65.20 | Calcific tendinitis, unspecified site | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.22 Calcific tendinitis, upper arm | ||||
| M65.221 | Calcific tendinitis, right upper arm | Can lead a claim | E | None |
| M65.222 | Calcific tendinitis, left upper arm | Can lead a claim | E | None |
| M65.229 | Calcific tendinitis, unspecified upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.23 Calcific tendinitis, forearm | ||||
| M65.231 | Calcific tendinitis, right forearm | Can lead a claim | E | None |
| M65.232 | Calcific tendinitis, left forearm | Can lead a claim | E | None |
| M65.239 | Calcific tendinitis, unspecified forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.24 Calcific tendinitis, hand | ||||
| M65.241 | Calcific tendinitis, right hand | Can lead a claim | E | None |
| M65.242 | Calcific tendinitis, left hand | Can lead a claim | E | None |
| M65.249 | Calcific tendinitis, unspecified hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.25 Calcific tendinitis, thigh | ||||
| M65.251 | Calcific tendinitis, right thigh | Can lead a claim | E | None |
| M65.252 | Calcific tendinitis, left thigh | Can lead a claim | E | None |
| M65.259 | Calcific tendinitis, unspecified thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.26 Calcific tendinitis, lower leg | ||||
| M65.261 | Calcific tendinitis, right lower leg | Can lead a claim | E | None |
| M65.262 | Calcific tendinitis, left lower leg | Can lead a claim | E | None |
| M65.269 | Calcific tendinitis, unspecified lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.27 Calcific tendinitis, ankle and foot | ||||
| M65.271 | Calcific tendinitis, right ankle and foot | Can lead a claim | E | None |
| M65.272 | Calcific tendinitis, left ankle and foot | Can lead a claim | E | None |
| M65.279 | Calcific tendinitis, unspecified ankle and foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.28 | Calcific tendinitis, other site | Can lead a claim | E | None |
| M65.29 | Calcific tendinitis, multiple sites | Can lead a claim | E | None |
| M65.3 Trigger finger | ||||
| M65.30 | Trigger finger, unspecified finger | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.31 Trigger thumb | ||||
| M65.311 | Trigger thumb, right thumb | Can lead a claim | E | None |
| M65.312 | Trigger thumb, left thumb | Can lead a claim | E | None |
| M65.319 | Trigger thumb, unspecified thumb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.32 Trigger finger, index finger | ||||
| M65.321 | Trigger finger, right index finger | Can lead a claim | E | None |
| M65.322 | Trigger finger, left index finger | Can lead a claim | E | None |
| M65.329 | Trigger finger, unspecified index finger | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.33 Trigger finger, middle finger | ||||
| M65.331 | Trigger finger, right middle finger | Can lead a claim | E | None |
| M65.332 | Trigger finger, left middle finger | Can lead a claim | E | None |
| M65.339 | Trigger finger, unspecified middle finger | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.34 Trigger finger, ring finger | ||||
| M65.341 | Trigger finger, right ring finger | Can lead a claim | E | None |
| M65.342 | Trigger finger, left ring finger | Can lead a claim | E | None |
| M65.349 | Trigger finger, unspecified ring finger | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.35 Trigger finger, little finger | ||||
| M65.351 | Trigger finger, right little finger | Can lead a claim | E | None |
| M65.352 | Trigger finger, left little finger | Can lead a claim | E | None |
| M65.359 | Trigger finger, unspecified little finger | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.4 | Radial styloid tenosynovitis [de Quervain] | Can lead a claim | E | None |
| M65.8 Other synovitis and tenosynovitis | ||||
| M65.80 | Other synovitis and tenosynovitis, unspecified site | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.81 Other synovitis and tenosynovitis, shoulder | ||||
| M65.811 | Other synovitis and tenosynovitis, right shoulder | Can lead a claim | E | None |
| M65.812 | Other synovitis and tenosynovitis, left shoulder | Can lead a claim | E | None |
| M65.819 | Other synovitis and tenosynovitis, unspecified shoulder | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.82 Other synovitis and tenosynovitis, upper arm | ||||
| M65.821 | Other synovitis and tenosynovitis, right upper arm | Can lead a claim | E | None |
| M65.822 | Other synovitis and tenosynovitis, left upper arm | Can lead a claim | E | None |
| M65.829 | Other synovitis and tenosynovitis, unspecified upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.83 Other synovitis and tenosynovitis, forearm | ||||
| M65.831 | Other synovitis and tenosynovitis, right forearm | Can lead a claim | E | None |
| M65.832 | Other synovitis and tenosynovitis, left forearm | Can lead a claim | E | None |
| M65.839 | Other synovitis and tenosynovitis, unspecified forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.84 Other synovitis and tenosynovitis, hand | ||||
| M65.841 | Other synovitis and tenosynovitis, right hand | Can lead a claim | E | None |
| M65.842 | Other synovitis and tenosynovitis, left hand | Can lead a claim | E | None |
| M65.849 | Other synovitis and tenosynovitis, unspecified hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.85 Other synovitis and tenosynovitis, thigh | ||||
| M65.851 | Other synovitis and tenosynovitis, right thigh | Can lead a claim | E | None |
| M65.852 | Other synovitis and tenosynovitis, left thigh | Can lead a claim | E | None |
| M65.859 | Other synovitis and tenosynovitis, unspecified thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.86 Other synovitis and tenosynovitis, lower leg | ||||
| M65.861 | Other synovitis and tenosynovitis, right lower leg | Can lead a claim | E | None |
| M65.862 | Other synovitis and tenosynovitis, left lower leg | Can lead a claim | E | None |
| M65.869 | Other synovitis and tenosynovitis, unspecified lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.87 Other synovitis and tenosynovitis, ankle and foot | ||||
| M65.871 | Other synovitis and tenosynovitis, right ankle and foot | Can lead a claim | E | None |
| M65.872 | Other synovitis and tenosynovitis, left ankle and foot | Can lead a claim | E | None |
| M65.879 | Other synovitis and tenosynovitis, unspecified ankle and footCMS: Other synovitis and tenosynovitis, unsp ankle and foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.88 | Other synovitis and tenosynovitis, other site | Can lead a claim | E | None |
| M65.89 | Other synovitis and tenosynovitis, multiple sites | Can lead a claim | E | None |
| M65.9 Synovitis and tenosynovitis, unspecified | ||||
| M65.90 | Unspecified synovitis and tenosynovitis, unspecified site | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| M65.91 Unspecified synovitis and tenosynovitis, shoulder | ||||
| M65.911 | Unspecified synovitis and tenosynovitis, right shoulder | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.912 | Unspecified synovitis and tenosynovitis, left shoulder | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.919 | Unspecified synovitis and tenosynovitis, unspecified shoulderCMS: Unsp synovitis and tenosynovitis, unspecified shoulder | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.92 Unspecified synovitis and tenosynovitis, upper arm | ||||
| M65.921 | Unspecified synovitis and tenosynovitis, right upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.922 | Unspecified synovitis and tenosynovitis, left upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.929 | Unspecified synovitis and tenosynovitis, unspecified upper armCMS: Unsp synovitis and tenosynovitis, unspecified upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.93 Unspecified synovitis and tenosynovitis, forearm | ||||
| M65.931 | Unspecified synovitis and tenosynovitis, right forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.932 | Unspecified synovitis and tenosynovitis, left forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.939 | Unspecified synovitis and tenosynovitis, unspecified forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.94 Unspecified synovitis and tenosynovitis, hand | ||||
| M65.941 | Unspecified synovitis and tenosynovitis, right hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.942 | Unspecified synovitis and tenosynovitis, left hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.949 | Unspecified synovitis and tenosynovitis, unspecified hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.95 Unspecified synovitis and tenosynovitis, thigh | ||||
| M65.951 | Unspecified synovitis and tenosynovitis, right thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.952 | Unspecified synovitis and tenosynovitis, left thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.959 | Unspecified synovitis and tenosynovitis, unspecified thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.96 Unspecified synovitis and tenosynovitis, lower leg | ||||
| M65.961 | Unspecified synovitis and tenosynovitis, right lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.962 | Unspecified synovitis and tenosynovitis, left lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.969 | Unspecified synovitis and tenosynovitis, unspecified lower legCMS: Unsp synovitis and tenosynovitis, unspecified lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.97 Unspecified synovitis and tenosynovitis, ankle and foot | ||||
| M65.971 | Unspecified synovitis and tenosynovitis, right ankle and footCMS: Unspecified synovitis and tenosynovitis, right ank/ft | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.972 | Unspecified synovitis and tenosynovitis, left ankle and foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.979 | Unspecified synovitis and tenosynovitis, unspecified ankle and footCMS: Unspecified synovitis and tenosynovitis, unspecified ank/ft | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.98 | Unspecified synovitis and tenosynovitis, other site | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M65.99 | Unspecified synovitis and tenosynovitis, multiple sites | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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