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
  • M75.30

    Calcific tendinitis of unspecified shoulder

  • M75.31

    Calcific tendinitis of right shoulder

  • M75.32

    Calcific tendinitis of left shoulder

  • M75.40

    Impingement syndrome of unspecified shoulder

  • M75.41

    Impingement syndrome of right shoulder

  • M75.42

    Impingement syndrome of left shoulder

  • M75.50

    Bursitis of unspecified shoulder

  • M75.51

    Bursitis of right shoulder

  • M75.52

    Bursitis of left shoulder

  • M75.80

    Other shoulder lesions, unspecified shoulder

  • M75.81

    Other shoulder lesions, right shoulder

  • M75.82

    Other shoulder lesions, left shoulder

  • M75.90

    Shoulder lesion, unspecified, unspecified shoulder

  • M75.91

    Shoulder lesion, unspecified, right shoulder

  • M75.92

    Shoulder lesion, unspecified, left shoulder

  • M76.00

    Gluteal tendinitis, unspecified hip

  • M76.01

    Gluteal tendinitis, right hip

  • M76.02

    Gluteal tendinitis, left hip

  • M76.10

    Psoas tendinitis, unspecified hip

  • M76.11

    Psoas tendinitis, right hip

  • M76.12

    Psoas tendinitis, left hip

  • M76.20

    Iliac crest spur, unspecified hip

  • M76.21

    Iliac crest spur, right hip

  • M76.22

    Iliac crest spur, left hip

  • M76.30

    Iliotibial band syndrome, unspecified leg

  • M76.31

    Iliotibial band syndrome, right leg

  • M76.32

    Iliotibial band syndrome, left leg

  • M76.40

    Tibial collateral bursitis [Pellegrini-Stieda], unspecified leg

  • M76.41

    Tibial collateral bursitis [Pellegrini-Stieda], right leg

  • M76.42

    Tibial collateral bursitis [Pellegrini-Stieda], left leg

  • M76.50

    Patellar tendinitis, unspecified knee

  • M76.51

    Patellar tendinitis, right knee

  • M76.52

    Patellar tendinitis, left knee

  • M76.60

    Achilles tendinitis, unspecified leg

  • M76.61

    Achilles tendinitis, right leg

  • M76.62

    Achilles tendinitis, left leg

  • M76.70

    Peroneal tendinitis, unspecified leg

  • M76.71

    Peroneal tendinitis, right leg

  • M76.72

    Peroneal tendinitis, left leg

  • M76.811

    Anterior tibial syndrome, right leg

  • M76.812

    Anterior tibial syndrome, left leg

  • M76.819

    Anterior tibial syndrome, unspecified leg

  • M76.821

    Posterior tibial tendinitis, right leg

  • M76.822

    Posterior tibial tendinitis, left leg

  • M76.829

    Posterior tibial tendinitis, unspecified leg

  • M76.891

    Other specified enthesopathies of right lower limb, excluding foot

  • M76.892

    Other specified enthesopathies of left lower limb, excluding foot

  • M76.899

    Other specified enthesopathies of unspecified lower limb, excluding foot

  • M76.9

    Unspecified enthesopathy, lower limb, excluding foot

  • M77.00

    Medial epicondylitis, unspecified elbow

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