DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M65 Synovitis and tenosynovitis

  • Header · not billable

M65 is not billable. The category heads 133 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M65-M67 Disorders of synovium and tendon (M65-M67)
  3. M65 Synovitis and tenosynovitis
Billable codes
133
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
70

Codes in M65

  1. M65.0
    Abscess of tendon sheath
    Header
    Use additional code 1

    Use additional code

    • code (B95-B96) to identify bacterial agent. B95 B96
  2. M65.00
    Abscess of tendon sheath, unspecified site
    Billable
  3. M65.01
    Abscess of tendon sheath, shoulder
    Header
  4. M65.011
    Abscess of tendon sheath, right shoulder
    Billable
  5. M65.012
    Abscess of tendon sheath, left shoulder
    Billable
  6. M65.019
    Abscess of tendon sheath, unspecified shoulder
    Billable
  7. M65.02
    Abscess of tendon sheath, upper arm
    Header
  8. M65.021
    Abscess of tendon sheath, right upper arm
    Billable
  9. M65.022
    Abscess of tendon sheath, left upper arm
    Billable
  10. M65.029
    Abscess of tendon sheath, unspecified upper arm
    Billable
  11. M65.03
    Abscess of tendon sheath, forearm
    Header
  12. M65.031
    Abscess of tendon sheath, right forearm
    Billable
  13. M65.032
    Abscess of tendon sheath, left forearm
    Billable
  14. M65.039
    Abscess of tendon sheath, unspecified forearm
    Billable
  15. M65.04
    Abscess of tendon sheath, hand
    Header
  16. M65.041
    Abscess of tendon sheath, right hand
    Billable
  17. M65.042
    Abscess of tendon sheath, left hand
    Billable
  18. M65.049
    Abscess of tendon sheath, unspecified hand
    Billable
  19. M65.05
    Abscess of tendon sheath, thigh
    Header
  20. M65.051
    Abscess of tendon sheath, right thigh
    Billable
  21. M65.052
    Abscess of tendon sheath, left thigh
    Billable
  22. M65.059
    Abscess of tendon sheath, unspecified thigh
    Billable
  23. M65.06
    Abscess of tendon sheath, lower leg
    Header
  24. M65.061
    Abscess of tendon sheath, right lower leg
    Billable
  25. M65.062
    Abscess of tendon sheath, left lower leg
    Billable
  26. M65.069
    Abscess of tendon sheath, unspecified lower leg
    Billable
  27. M65.07
    Abscess of tendon sheath, ankle and foot
    Header
  28. M65.071
    Abscess of tendon sheath, right ankle and foot
    Billable
  29. M65.072
    Abscess of tendon sheath, left ankle and foot
    Billable
  30. M65.079
    Abscess of tendon sheath, unspecified ankle and foot
    Billable
  31. M65.08
    Abscess of tendon sheath, other site
    Billable
  32. M65.1
    Other infective (teno)synovitis
    Header
  33. M65.10
    Other infective (teno)synovitis, unspecified site
    Billable
  34. M65.11
    Other infective (teno)synovitis, shoulder
    Header
  35. M65.111
    Other infective (teno)synovitis, right shoulder
    Billable
  36. M65.112
    Other infective (teno)synovitis, left shoulder
    Billable
  37. M65.119
    Other infective (teno)synovitis, unspecified shoulder
    Billable
  38. M65.12
    Other infective (teno)synovitis, elbow
    Header
  39. M65.121
    Other infective (teno)synovitis, right elbow
    Billable
  40. M65.122
    Other infective (teno)synovitis, left elbow
    Billable
  41. M65.129
    Other infective (teno)synovitis, unspecified elbow
    Billable
  42. M65.13
    Other infective (teno)synovitis, wrist
    Header
  43. M65.131
    Other infective (teno)synovitis, right wrist
    Billable
  44. M65.132
    Other infective (teno)synovitis, left wrist
    Billable
  45. M65.139
    Other infective (teno)synovitis, unspecified wrist
    Billable
  46. M65.14
    Other infective (teno)synovitis, hand
    Header
  47. M65.141
    Other infective (teno)synovitis, right hand
    Billable
  48. M65.142
    Other infective (teno)synovitis, left hand
    Billable
  49. M65.149
    Other infective (teno)synovitis, unspecified hand
    Billable
  50. M65.15
    Other infective (teno)synovitis, hip
    Header
  51. M65.151
    Other infective (teno)synovitis, right hip
    Billable
  52. M65.152
    Other infective (teno)synovitis, left hip
    Billable
  53. M65.159
    Other infective (teno)synovitis, unspecified hip
    Billable
  54. M65.16
    Other infective (teno)synovitis, knee
    Header
  55. M65.161
    Other infective (teno)synovitis, right knee
    Billable
  56. M65.162
    Other infective (teno)synovitis, left knee
    Billable
  57. M65.169
    Other infective (teno)synovitis, unspecified knee
    Billable
  58. M65.17
    Other infective (teno)synovitis, ankle and foot
    Header
  59. M65.171
    Other infective (teno)synovitis, right ankle and foot
    Billable
  60. M65.172
    Other infective (teno)synovitis, left ankle and foot
    Billable
  61. M65.179
    Other infective (teno)synovitis, unspecified ankle and foot
    Billable
  62. M65.18
    Other infective (teno)synovitis, other site
    Billable
  63. M65.19
    Other infective (teno)synovitis, multiple sites
    Billable
  64. M65.2
    Calcific tendinitis
    Header
    Excludes1 2

    Excludes1

    • tendinitis as classified in M75-M77 M75 M77
    • calcified tendinitis of shoulder (M75.3) M75.3
  65. M65.20
    Calcific tendinitis, unspecified site
    Billable
  66. M65.22
    Calcific tendinitis, upper arm
    Header
  67. M65.221
    Calcific tendinitis, right upper arm
    Billable
  68. M65.222
    Calcific tendinitis, left upper arm
    Billable
  69. M65.229
    Calcific tendinitis, unspecified upper arm
    Billable
  70. M65.23
    Calcific tendinitis, forearm
    Header
  71. M65.231
    Calcific tendinitis, right forearm
    Billable
  72. M65.232
    Calcific tendinitis, left forearm
    Billable
  73. M65.239
    Calcific tendinitis, unspecified forearm
    Billable
  74. M65.24
    Calcific tendinitis, hand
    Header
  75. M65.241
    Calcific tendinitis, right hand
    Billable
  76. M65.242
    Calcific tendinitis, left hand
    Billable
  77. M65.249
    Calcific tendinitis, unspecified hand
    Billable
  78. M65.25
    Calcific tendinitis, thigh
    Header
  79. M65.251
    Calcific tendinitis, right thigh
    Billable
  80. M65.252
    Calcific tendinitis, left thigh
    Billable
  81. M65.259
    Calcific tendinitis, unspecified thigh
    Billable
  82. M65.26
    Calcific tendinitis, lower leg
    Header
  83. M65.261
    Calcific tendinitis, right lower leg
    Billable
  84. M65.262
    Calcific tendinitis, left lower leg
    Billable
  85. M65.269
    Calcific tendinitis, unspecified lower leg
    Billable
  86. M65.27
    Calcific tendinitis, ankle and foot
    Header
  87. M65.271
    Calcific tendinitis, right ankle and foot
    Billable
  88. M65.272
    Calcific tendinitis, left ankle and foot
    Billable
  89. M65.279
    Calcific tendinitis, unspecified ankle and foot
    Billable
  90. M65.28
    Calcific tendinitis, other site
    Billable
  91. M65.29
    Calcific tendinitis, multiple sites
    Billable
  92. M65.3
    Trigger finger
    Header
    Inclusion terms 1

    Inclusion terms

    • Nodular tendinous disease
  93. M65.30
    Trigger finger, unspecified finger
    Billable
  94. M65.31
    Trigger thumb
    Header
  95. M65.311
    Trigger thumb, right thumb
    Billable
  96. M65.312
    Trigger thumb, left thumb
    Billable
  97. M65.319
    Trigger thumb, unspecified thumb
    Billable
  98. M65.32
    Trigger finger, index finger
    Header
  99. M65.321
    Trigger finger, right index finger
    Billable
  100. M65.322
    Trigger finger, left index finger
    Billable
  101. M65.329
    Trigger finger, unspecified index finger
    Billable
  102. M65.33
    Trigger finger, middle finger
    Header
  103. M65.331
    Trigger finger, right middle finger
    Billable
  104. M65.332
    Trigger finger, left middle finger
    Billable
  105. M65.339
    Trigger finger, unspecified middle finger
    Billable
  106. M65.34
    Trigger finger, ring finger
    Header
  107. M65.341
    Trigger finger, right ring finger
    Billable
  108. M65.342
    Trigger finger, left ring finger
    Billable
  109. M65.349
    Trigger finger, unspecified ring finger
    Billable
  110. M65.35
    Trigger finger, little finger
    Header
  111. M65.351
    Trigger finger, right little finger
    Billable
  112. M65.352
    Trigger finger, left little finger
    Billable
  113. M65.359
    Trigger finger, unspecified little finger
    Billable
  114. M65.4
    Radial styloid tenosynovitis [de Quervain]
    Billable
  115. M65.8
    Other synovitis and tenosynovitis
    Header
  116. M65.80
    Other synovitis and tenosynovitis, unspecified site
    Billable
  117. M65.81
    Other synovitis and tenosynovitis, shoulder
    Header
  118. M65.811
    Other synovitis and tenosynovitis, right shoulder
    Billable
  119. M65.812
    Other synovitis and tenosynovitis, left shoulder
    Billable
  120. M65.819
    Other synovitis and tenosynovitis, unspecified shoulder
    Billable
  121. M65.82
    Other synovitis and tenosynovitis, upper arm
    Header
  122. M65.821
    Other synovitis and tenosynovitis, right upper arm
    Billable
  123. M65.822
    Other synovitis and tenosynovitis, left upper arm
    Billable
  124. M65.829
    Other synovitis and tenosynovitis, unspecified upper arm
    Billable
  125. M65.83
    Other synovitis and tenosynovitis, forearm
    Header
  126. M65.831
    Other synovitis and tenosynovitis, right forearm
    Billable
  127. M65.832
    Other synovitis and tenosynovitis, left forearm
    Billable
  128. M65.839
    Other synovitis and tenosynovitis, unspecified forearm
    Billable
  129. M65.84
    Other synovitis and tenosynovitis, hand
    Header
  130. M65.841
    Other synovitis and tenosynovitis, right hand
    Billable
  131. M65.842
    Other synovitis and tenosynovitis, left hand
    Billable
  132. M65.849
    Other synovitis and tenosynovitis, unspecified hand
    Billable
  133. M65.85
    Other synovitis and tenosynovitis, thigh
    Header
  134. M65.851
    Other synovitis and tenosynovitis, right thigh
    Billable
  135. M65.852
    Other synovitis and tenosynovitis, left thigh
    Billable
  136. M65.859
    Other synovitis and tenosynovitis, unspecified thigh
    Billable
  137. M65.86
    Other synovitis and tenosynovitis, lower leg
    Header
  138. M65.861
    Other synovitis and tenosynovitis, right lower leg
    Billable
  139. M65.862
    Other synovitis and tenosynovitis, left lower leg
    Billable
  140. M65.869
    Other synovitis and tenosynovitis, unspecified lower leg
    Billable
  141. M65.87
    Other synovitis and tenosynovitis, ankle and foot
    Header
  142. M65.871
    Other synovitis and tenosynovitis, right ankle and foot
    Billable
  143. M65.872
    Other synovitis and tenosynovitis, left ankle and foot
    Billable
  144. M65.879
    Other synovitis and tenosynovitis, unspecified ankle and foot
    Billable
  145. M65.88
    Other synovitis and tenosynovitis, other site
    Billable
  146. M65.89
    Other synovitis and tenosynovitis, multiple sites
    Billable
  147. M65.9
    Synovitis and tenosynovitis, unspecified
    Header
  148. M65.90
    Unspecified synovitis and tenosynovitis, unspecified site
    Billable
  149. M65.91
    Unspecified synovitis and tenosynovitis, shoulder
    Header
  150. M65.911
    Unspecified synovitis and tenosynovitis, right shoulder
    Billable
  151. M65.912
    Unspecified synovitis and tenosynovitis, left shoulder
    Billable
  152. M65.919
    Unspecified synovitis and tenosynovitis, unspecified shoulder
    Billable
  153. M65.92
    Unspecified synovitis and tenosynovitis, upper arm
    Header
  154. M65.921
    Unspecified synovitis and tenosynovitis, right upper arm
    Billable
  155. M65.922
    Unspecified synovitis and tenosynovitis, left upper arm
    Billable
  156. M65.929
    Unspecified synovitis and tenosynovitis, unspecified upper arm
    Billable
  157. M65.93
    Unspecified synovitis and tenosynovitis, forearm
    Header
  158. M65.931
    Unspecified synovitis and tenosynovitis, right forearm
    Billable
  159. M65.932
    Unspecified synovitis and tenosynovitis, left forearm
    Billable
  160. M65.939
    Unspecified synovitis and tenosynovitis, unspecified forearm
    Billable
  161. M65.94
    Unspecified synovitis and tenosynovitis, hand
    Header
  162. M65.941
    Unspecified synovitis and tenosynovitis, right hand
    Billable
  163. M65.942
    Unspecified synovitis and tenosynovitis, left hand
    Billable
  164. M65.949
    Unspecified synovitis and tenosynovitis, unspecified hand
    Billable
  165. M65.95
    Unspecified synovitis and tenosynovitis, thigh
    Header
  166. M65.951
    Unspecified synovitis and tenosynovitis, right thigh
    Billable
  167. M65.952
    Unspecified synovitis and tenosynovitis, left thigh
    Billable
  168. M65.959
    Unspecified synovitis and tenosynovitis, unspecified thigh
    Billable
  169. M65.96
    Unspecified synovitis and tenosynovitis, lower leg
    Header
  170. M65.961
    Unspecified synovitis and tenosynovitis, right lower leg
    Billable
  171. M65.962
    Unspecified synovitis and tenosynovitis, left lower leg
    Billable
  172. M65.969
    Unspecified synovitis and tenosynovitis, unspecified lower leg
    Billable
  173. M65.97
    Unspecified synovitis and tenosynovitis, ankle and foot
    Header
  174. M65.971
    Unspecified synovitis and tenosynovitis, right ankle and foot
    Billable
  175. M65.972
    Unspecified synovitis and tenosynovitis, left ankle and foot
    Billable
  176. M65.979
    Unspecified synovitis and tenosynovitis, unspecified ankle and foot
    Billable
  177. M65.98
    Unspecified synovitis and tenosynovitis, other site
    Billable
  178. M65.99
    Unspecified synovitis and tenosynovitis, multiple sites
    Billable

Sources of each column.

Instructions

At M65

Excludes1

  • chronic crepitant synovitis of hand and wrist (M70.0-) M70.0
  • current injury - see injury of ligament or tendon by body region
  • soft tissue disorders related to use, overuse and pressure (M70.-) M70

Notes that also apply

Chapter 13 instructions (Notes 1, Excludes2 10): printed on the chapter 13 page.

Index entries

  • Trigger finger (acquired) → M65.30
  • Quervain's disease → M65.4
  • Synovitis → M65.90
  • Tenosynovitis → M65.90
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath) → M65.00
  • Tenosynovitisinfective NEC → M65.1-
  • Tendinitis, tendonitiscalcific → M65.2-
  • Trigger finger (acquired)thumb → M65.31-
  • Trigger finger (acquired)index finger → M65.32-
  • Trigger finger (acquired)middle finger → M65.33-
  • Trigger finger (acquired)ring finger → M65.34-
  • Trigger finger (acquired)little finger → M65.35-
  • De Quervain'sdisease (tendon sheath) → M65.4
  • Disease, diseasedde Quervain's (tendon sheath) → M65.4
  • Tenosynovitisradial styloid → M65.4
  • Tenosynovitisshoulder region → M65.81-
  • Tenosynovitisspecified type NEC → M65.88
  • Synovitisshoulder → M65.91-
  • Synovitisarm, upper → M65.92-
  • Synovitisforearm → M65.93-
  • Synovitishand → M65.94-
  • Synovitisthigh → M65.95-
  • Synovitisleg, lower → M65.96-
  • Synovitisankle and foot → M65.97-
  • Synovitisspecified site, unspecified type → M65.98
  • Synovitismultiple sites, unspecified type → M65.99
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)shoulder region → M65.01-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)upper arm → M65.02-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)forearm → M65.03-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)hand → M65.04-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)pelvic region → M65.05-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)thigh → M65.05-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)lower leg → M65.06-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)ankle → M65.07-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)foot → M65.07-
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)tendon (sheath)specified site NEC → M65.08
  • Tenosynovitisinfective NECshoulder region → M65.11-
  • Tenosynovitisinfective NECupper arm → M65.12-
  • Tenosynovitisinfective NECforearm → M65.13-
  • Tenosynovitisinfective NEChand → M65.14-

30 more, longer entries are not listed; the search box finds them by word.

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Hierarchy