Chapter 13

M00–M99: Diseases of the Musculoskeletal System and Connective Tissue

Diseases of the Musculoskeletal System and Connective Tissue diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Internal Codes
  • M50.20

    Other cervical disc displacement, unspecified cervical region

  • M50.21

    Other cervical disc displacement, high cervical region

  • M50.220

    Other cervical disc displacement, mid-cervical region, unspecified level

  • M50.221

    Other cervical disc displacement at C4-C5 level

  • M50.222

    Other cervical disc displacement at C5-C6 level

  • M50.223

    Other cervical disc displacement at C6-C7 level

  • M50.23

    Other cervical disc displacement, cervicothoracic region

  • M50.30

    Other cervical disc degeneration, unspecified cervical region

  • M50.31

    Other cervical disc degeneration, high cervical region

  • M50.320

    Other cervical disc degeneration, mid-cervical region, unspecified level

  • M50.321

    Other cervical disc degeneration at C4-C5 level

  • M50.322

    Other cervical disc degeneration at C5-C6 level

  • M50.323

    Other cervical disc degeneration at C6-C7 level

  • M50.33

    Other cervical disc degeneration, cervicothoracic region

  • M50.80

    Other cervical disc disorders, unspecified cervical region

  • M50.81

    Other cervical disc disorders, high cervical region

  • M50.820

    Other cervical disc disorders, mid-cervical region, unspecified level

  • M50.821

    Other cervical disc disorders at C4-C5 level

  • M50.822

    Other cervical disc disorders at C5-C6 level

  • M50.823

    Other cervical disc disorders at C6-C7 level

  • M50.83

    Other cervical disc disorders, cervicothoracic region

  • M50.90

    Cervical disc disorder, unspecified, unspecified cervical region

  • M50.91

    Cervical disc disorder, unspecified, high cervical region

  • M50.920

    Unspecified cervical disc disorder, mid-cervical region, unspecified level

  • M50.921

    Unspecified cervical disc disorder at C4-C5 level

  • M50.922

    Unspecified cervical disc disorder at C5-C6 level

  • M50.923

    Unspecified cervical disc disorder at C6-C7 level

  • M50.93

    Cervical disc disorder, unspecified, cervicothoracic region

  • M51.04

    Intervertebral disc disorders with myelopathy, thoracic region

  • M51.05

    Intervertebral disc disorders with myelopathy, thoracolumbar region

  • M51.06

    Intervertebral disc disorders with myelopathy, lumbar region

  • M51.14

    Intervertebral disc disorders with radiculopathy, thoracic region

  • M51.15

    Intervertebral disc disorders with radiculopathy, thoracolumbar region

  • M51.16

    Intervertebral disc disorders with radiculopathy, lumbar region

  • M51.17

    Intervertebral disc disorders with radiculopathy, lumbosacral region

  • M51.24

    Other intervertebral disc displacement, thoracic region

  • M51.25

    Other intervertebral disc displacement, thoracolumbar region

  • M51.26

    Other intervertebral disc displacement, lumbar region

  • M51.27

    Other intervertebral disc displacement, lumbosacral region

  • M51.34

    Other intervertebral disc degeneration, thoracic region

  • M51.35

    Other intervertebral disc degeneration, thoracolumbar region

  • M51.360

    Other intervertebral disc degeneration, lumbar region with discogenic back pain only

  • M51.361

    Other intervertebral disc degeneration, lumbar region with lower extremity pain only

  • M51.362

    Other intervertebral disc degeneration, lumbar region with discogenic back pain and lower extremity pain

  • M51.369

    Other intervertebral disc degeneration, lumbar region without mention of lumbar back pain or lower extremity pain

  • M51.370

    Other intervertebral disc degeneration, lumbosacral region with discogenic back pain only

  • M51.371

    Other intervertebral disc degeneration, lumbosacral region with lower extremity pain only

  • M51.372

    Other intervertebral disc degeneration, lumbosacral region with discogenic back pain and lower extremity pain

  • M51.379

    Other intervertebral disc degeneration, lumbosacral region without mention of lumbar back pain or lower extremity pain

  • M51.44

    Schmorl's nodes, thoracic region

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