All ICD10 Codes
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)
All CodesBillable Only
Internal Codes
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  • M21.949—

    Unspecified acquired deformity of hand, unspecified hand

  • M21.951—

    Unspecified acquired deformity of right thigh

  • M21.952—

    Unspecified acquired deformity of left thigh

  • M21.959—

    Unspecified acquired deformity of unspecified thigh

  • M21.961—

    Unspecified acquired deformity of right lower leg

  • M21.962—

    Unspecified acquired deformity of left lower leg

  • M21.969—

    Unspecified acquired deformity of unspecified lower leg

  • M22.00—

    Recurrent dislocation of patella, unspecified knee

  • M22.01—

    Recurrent dislocation of patella, right knee

  • M22.02—

    Recurrent dislocation of patella, left knee

  • M22.10—

    Recurrent subluxation of patella, unspecified knee

  • M22.11—

    Recurrent subluxation of patella, right knee

  • M22.12—

    Recurrent subluxation of patella, left knee

  • M22.2X1—

    Patellofemoral disorders, right knee

  • M22.2X2—

    Patellofemoral disorders, left knee

  • M22.2X9—

    Patellofemoral disorders, unspecified knee

  • M22.3X1—

    Other derangements of patella, right knee

  • M22.3X2—

    Other derangements of patella, left knee

  • M22.3X9—

    Other derangements of patella, unspecified knee

  • M22.40—

    Chondromalacia patellae, unspecified knee

  • M22.41—

    Chondromalacia patellae, right knee

  • M22.42—

    Chondromalacia patellae, left knee

  • M22.8X1—

    Other disorders of patella, right knee

  • M22.8X2—

    Other disorders of patella, left knee

  • M22.8X9—

    Other disorders of patella, unspecified knee

  • M22.90—

    Unspecified disorder of patella, unspecified knee

  • M22.91—

    Unspecified disorder of patella, right knee

  • M22.92—

    Unspecified disorder of patella, left knee

  • M23.000—

    Cystic meniscus, unspecified lateral meniscus, right knee

  • M23.001—

    Cystic meniscus, unspecified lateral meniscus, left knee

  • M23.002—

    Cystic meniscus, unspecified lateral meniscus, unspecified knee

  • M23.003—

    Cystic meniscus, unspecified medial meniscus, right knee

  • M23.004—

    Cystic meniscus, unspecified medial meniscus, left knee

  • M23.005—

    Cystic meniscus, unspecified medial meniscus, unspecified knee

  • M23.006—

    Cystic meniscus, unspecified meniscus, right knee

  • M23.007—

    Cystic meniscus, unspecified meniscus, left knee

  • M23.009—

    Cystic meniscus, unspecified meniscus, unspecified knee

  • M23.011—

    Cystic meniscus, anterior horn of medial meniscus, right knee

  • M23.012—

    Cystic meniscus, anterior horn of medial meniscus, left knee

  • M23.019—

    Cystic meniscus, anterior horn of medial meniscus, unspecified knee

  • M23.021—

    Cystic meniscus, posterior horn of medial meniscus, right knee

  • M23.022—

    Cystic meniscus, posterior horn of medial meniscus, left knee

  • M23.029—

    Cystic meniscus, posterior horn of medial meniscus, unspecified knee

  • M23.031—

    Cystic meniscus, other medial meniscus, right knee

  • M23.032—

    Cystic meniscus, other medial meniscus, left knee

  • M23.039—

    Cystic meniscus, other medial meniscus, unspecified knee

  • M23.041—

    Cystic meniscus, anterior horn of lateral meniscus, right knee

  • M23.042—

    Cystic meniscus, anterior horn of lateral meniscus, left knee

  • M23.049—

    Cystic meniscus, anterior horn of lateral meniscus, unspecified knee

  • M23.051—

    Cystic meniscus, posterior horn of lateral meniscus, right knee

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