DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M99 Biomechanical lesions, not elsewhere classified

  • Header · not billable

M99 is not billable. The category heads 91 billable codes in FY2027, grouped under 10 subdivisions.

Index → code

  • Dysfunctionsomatic → M99.09
  • Complexsubluxation (vertebral) → M99.19
  • Lesion(s) (nontraumatic)biomechanical → M99.9

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M99 Biomechanical lesions, not elsewhere classified (M99)
  3. M99 Biomechanical lesions, not elsewhere classified
Billable codes
91
Subdivisions
10
CC / MCC codes
3 / 0
HCC V28 codes
0
New FY2027
0
Index entries
197

Codes in M99

  1. M99.0
    Segmental and somatic dysfunction
    Header
  2. M99.00
    Segmental and somatic dysfunction of head region
    Billable
  3. M99.01
    Segmental and somatic dysfunction of cervical region
    Billable
  4. M99.02
    Segmental and somatic dysfunction of thoracic region
    Billable
  5. M99.03
    Segmental and somatic dysfunction of lumbar region
    Billable
  6. M99.04
    Segmental and somatic dysfunction of sacral region
    Billable
  7. M99.05
    Segmental and somatic dysfunction of pelvic region
    Billable
  8. M99.06
    Segmental and somatic dysfunction of lower extremity
    Billable
  9. M99.07
    Segmental and somatic dysfunction of upper extremity
    Billable
  10. M99.08
    Segmental and somatic dysfunction of rib cage
    Billable
  11. M99.09
    Segmental and somatic dysfunction of abdomen and other regions
    Billable
  12. M99.1
    Subluxation complex (vertebral)
    Header
  13. M99.10
    Subluxation complex (vertebral) of head region
    BillableCC
  14. M99.11
    Subluxation complex (vertebral) of cervical region
    BillableCC
  15. M99.12
    Subluxation complex (vertebral) of thoracic region
    Billable
  16. M99.13
    Subluxation complex (vertebral) of lumbar region
    Billable
  17. M99.14
    Subluxation complex (vertebral) of sacral region
    Billable
  18. M99.15
    Subluxation complex (vertebral) of pelvic region
    Billable
  19. M99.16
    Subluxation complex (vertebral) of lower extremity
    Billable
  20. M99.17
    Subluxation complex (vertebral) of upper extremity
    Billable
  21. M99.18
    Subluxation complex (vertebral) of rib cage
    BillableCC
  22. M99.19
    Subluxation complex (vertebral) of abdomen and other regions
    Billable
  23. M99.2
    Subluxation stenosis of neural canal
    Header
  24. M99.20
    Subluxation stenosis of neural canal of head region
    Billable
  25. M99.21
    Subluxation stenosis of neural canal of cervical region
    Billable
  26. M99.22
    Subluxation stenosis of neural canal of thoracic region
    Billable
  27. M99.23
    Subluxation stenosis of neural canal of lumbar region
    Billable
  28. M99.24
    Subluxation stenosis of neural canal of sacral region
    Billable
  29. M99.25
    Subluxation stenosis of neural canal of pelvic region
    Billable
  30. M99.26
    Subluxation stenosis of neural canal of lower extremity
    Billable
  31. M99.27
    Subluxation stenosis of neural canal of upper extremity
    Billable
  32. M99.28
    Subluxation stenosis of neural canal of rib cage
    Billable
  33. M99.29
    Subluxation stenosis of neural canal of abdomen and other regions
    Billable
  34. M99.3
    Osseous stenosis of neural canal
    Header
  35. M99.30
    Osseous stenosis of neural canal of head region
    Billable
  36. M99.31
    Osseous stenosis of neural canal of cervical region
    Billable
  37. M99.32
    Osseous stenosis of neural canal of thoracic region
    Billable
  38. M99.33
    Osseous stenosis of neural canal of lumbar region
    Billable
  39. M99.34
    Osseous stenosis of neural canal of sacral region
    Billable
  40. M99.35
    Osseous stenosis of neural canal of pelvic region
    Billable
  41. M99.36
    Osseous stenosis of neural canal of lower extremity
    Billable
  42. M99.37
    Osseous stenosis of neural canal of upper extremity
    Billable
  43. M99.38
    Osseous stenosis of neural canal of rib cage
    Billable
  44. M99.39
    Osseous stenosis of neural canal of abdomen and other regions
    Billable
  45. M99.4
    Connective tissue stenosis of neural canal
    Header
  46. M99.40
    Connective tissue stenosis of neural canal of head region
    Billable
  47. M99.41
    Connective tissue stenosis of neural canal of cervical region
    Billable
  48. M99.42
    Connective tissue stenosis of neural canal of thoracic region
    Billable
  49. M99.43
    Connective tissue stenosis of neural canal of lumbar region
    Billable
  50. M99.44
    Connective tissue stenosis of neural canal of sacral region
    Billable
  51. M99.45
    Connective tissue stenosis of neural canal of pelvic region
    Billable
  52. M99.46
    Connective tissue stenosis of neural canal of lower extremity
    Billable
  53. M99.47
    Connective tissue stenosis of neural canal of upper extremity
    Billable
  54. M99.48
    Connective tissue stenosis of neural canal of rib cage
    Billable
  55. M99.49
    Connective tissue stenosis of neural canal of abdomen and other regions
    Billable
  56. M99.5
    Intervertebral disc stenosis of neural canal
    Header
  57. M99.50
    Intervertebral disc stenosis of neural canal of head region
    Billable
  58. M99.51
    Intervertebral disc stenosis of neural canal of cervical region
    Billable
  59. M99.52
    Intervertebral disc stenosis of neural canal of thoracic region
    Billable
  60. M99.53
    Intervertebral disc stenosis of neural canal of lumbar region
    Billable
  61. M99.54
    Intervertebral disc stenosis of neural canal of sacral region
    Billable
  62. M99.55
    Intervertebral disc stenosis of neural canal of pelvic region
    Billable
  63. M99.56
    Intervertebral disc stenosis of neural canal of lower extremity
    Billable
  64. M99.57
    Intervertebral disc stenosis of neural canal of upper extremity
    Billable
  65. M99.58
    Intervertebral disc stenosis of neural canal of rib cage
    Billable
  66. M99.59
    Intervertebral disc stenosis of neural canal of abdomen and other regions
    Billable
  67. M99.6
    Osseous and subluxation stenosis of intervertebral foramina
    Header
  68. M99.60
    Osseous and subluxation stenosis of intervertebral foramina of head region
    Billable
  69. M99.61
    Osseous and subluxation stenosis of intervertebral foramina of cervical region
    Billable
  70. M99.62
    Osseous and subluxation stenosis of intervertebral foramina of thoracic region
    Billable
  71. M99.63
    Osseous and subluxation stenosis of intervertebral foramina of lumbar region
    Billable
  72. M99.64
    Osseous and subluxation stenosis of intervertebral foramina of sacral region
    Billable
  73. M99.65
    Osseous and subluxation stenosis of intervertebral foramina of pelvic region
    Billable
  74. M99.66
    Osseous and subluxation stenosis of intervertebral foramina of lower extremity
    Billable
  75. M99.67
    Osseous and subluxation stenosis of intervertebral foramina of upper extremity
    Billable
  76. M99.68
    Osseous and subluxation stenosis of intervertebral foramina of rib cage
    Billable
  77. M99.69
    Osseous and subluxation stenosis of intervertebral foramina of abdomen and other regions
    Billable
  78. M99.7
    Connective tissue and disc stenosis of intervertebral foramina
    Header
  79. M99.70
    Connective tissue and disc stenosis of intervertebral foramina of head region
    Billable
  80. M99.71
    Connective tissue and disc stenosis of intervertebral foramina of cervical region
    Billable
  81. M99.72
    Connective tissue and disc stenosis of intervertebral foramina of thoracic region
    Billable
  82. M99.73
    Connective tissue and disc stenosis of intervertebral foramina of lumbar region
    Billable
  83. M99.74
    Connective tissue and disc stenosis of intervertebral foramina of sacral region
    Billable
  84. M99.75
    Connective tissue and disc stenosis of intervertebral foramina of pelvic region
    Billable
  85. M99.76
    Connective tissue and disc stenosis of intervertebral foramina of lower extremity
    Billable
  86. M99.77
    Connective tissue and disc stenosis of intervertebral foramina of upper extremity
    Billable
  87. M99.78
    Connective tissue and disc stenosis of intervertebral foramina of rib cage
    Billable
  88. M99.79
    Connective tissue and disc stenosis of intervertebral foramina of abdomen and other regions
    Billable
  89. M99.8
    Other biomechanical lesions
    Header
  90. M99.80
    Other biomechanical lesions of head region
    Billable
  91. M99.81
    Other biomechanical lesions of cervical region
    Billable
  92. M99.82
    Other biomechanical lesions of thoracic region
    Billable
  93. M99.83
    Other biomechanical lesions of lumbar region
    Billable
  94. M99.84
    Other biomechanical lesions of sacral region
    Billable
  95. M99.85
    Other biomechanical lesions of pelvic region
    Billable
  96. M99.86
    Other biomechanical lesions of lower extremity
    Billable
  97. M99.87
    Other biomechanical lesions of upper extremity
    Billable
  98. M99.88
    Other biomechanical lesions of rib cage
    Billable
  99. M99.89
    Other biomechanical lesions of abdomen and other regions
    Billable
  100. M99.9
    Biomechanical lesion, unspecified
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At M99

Notes

  • This category should not be used if the condition can be classified elsewhere.

Notes that also apply

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

Index entries

  • Dysfunctionsomatic → M99.09
  • Complexsubluxation (vertebral) → M99.19
  • Lesion(s) (nontraumatic)biomechanical → M99.9
  • Dysfunctionsomatichead region → M99.00
  • Dysfunctionsomaticoccipitocervical → M99.00
  • Dysfunctionsomaticcervical region → M99.01
  • Dysfunctionsomaticcervicothoracic → M99.01
  • Dysfunctionsomaticthoracic region → M99.02
  • Dysfunctionsomaticthoracolumbar → M99.02
  • Dysfunctionsomaticlumbar region → M99.03
  • Dysfunctionsomaticlumbosacral → M99.03
  • Dysfunctionsomaticsacral region → M99.04
  • Dysfunctionsomaticsacrococcygeal → M99.04
  • Dysfunctionsomaticsacroiliac → M99.04
  • Dysfunctionsomatichip → M99.05
  • Dysfunctionsomaticpelvic region → M99.05
  • Dysfunctionsomaticpubic → M99.05
  • Dysfunctionsomaticlower extremity → M99.06
  • Dysfunctionsomaticacromioclavicular → M99.07
  • Dysfunctionsomaticsternoclavicular → M99.07
  • Dysfunctionsomaticupper extremity → M99.07
  • Dysfunctionsomaticcostochondral → M99.08
  • Dysfunctionsomaticcostovertebral → M99.08
  • Dysfunctionsomaticrib cage → M99.08
  • Dysfunctionsomaticsternochondral → M99.08
  • Dysfunctionsomaticabdomen → M99.09
  • Dysfunctionsomaticspecified NEC → M99.09
  • Complexsubluxation (vertebral)head region → M99.10
  • Complexsubluxation (vertebral)occipitocervical → M99.10
  • Complexsubluxation (vertebral)cervical region → M99.11
  • Complexsubluxation (vertebral)cervicothoracic → M99.11
  • Complexsubluxation (vertebral)thoracic region → M99.12
  • Complexsubluxation (vertebral)thoracolumbar → M99.12
  • Complexsubluxation (vertebral)lumbar region → M99.13
  • Complexsubluxation (vertebral)lumbosacral → M99.13
  • Complexsubluxation (vertebral)sacral region → M99.14
  • Complexsubluxation (vertebral)sacrococcygeal → M99.14
  • Complexsubluxation (vertebral)sacroiliac → M99.14
  • Complexsubluxation (vertebral)hip → M99.15
  • Complexsubluxation (vertebral)pelvic region → M99.15

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

NCHS Alphabetic Index. Index first, then the Tabular List.