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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  • M85.561—

    Aneurysmal bone cyst, right lower leg

  • M85.562—

    Aneurysmal bone cyst, left lower leg

  • M85.569—

    Aneurysmal bone cyst, unspecified lower leg

  • M85.571—

    Aneurysmal bone cyst, right ankle and foot

  • M85.572—

    Aneurysmal bone cyst, left ankle and foot

  • M85.579—

    Aneurysmal bone cyst, unspecified ankle and foot

  • M85.58—

    Aneurysmal bone cyst, other site

  • M85.59—

    Aneurysmal bone cyst, multiple sites

  • M85.60—

    Other cyst of bone, unspecified site

  • M85.611—

    Other cyst of bone, right shoulder

  • M85.612—

    Other cyst of bone, left shoulder

  • M85.619—

    Other cyst of bone, unspecified shoulder

  • M85.621—

    Other cyst of bone, right upper arm

  • M85.622—

    Other cyst of bone, left upper arm

  • M85.629—

    Other cyst of bone, unspecified upper arm

  • M85.631—

    Other cyst of bone, right forearm

  • M85.632—

    Other cyst of bone, left forearm

  • M85.639—

    Other cyst of bone, unspecified forearm

  • M85.641—

    Other cyst of bone, right hand

  • M85.642—

    Other cyst of bone, left hand

  • M85.649—

    Other cyst of bone, unspecified hand

  • M85.651—

    Other cyst of bone, right thigh

  • M85.652—

    Other cyst of bone, left thigh

  • M85.659—

    Other cyst of bone, unspecified thigh

  • M85.661—

    Other cyst of bone, right lower leg

  • M85.662—

    Other cyst of bone, left lower leg

  • M85.669—

    Other cyst of bone, unspecified lower leg

  • M85.671—

    Other cyst of bone, right ankle and foot

  • M85.672—

    Other cyst of bone, left ankle and foot

  • M85.679—

    Other cyst of bone, unspecified ankle and foot

  • M85.68—

    Other cyst of bone, other site

  • M85.69—

    Other cyst of bone, multiple sites

  • M85.80—

    Other specified disorders of bone density and structure, unspecified site

  • M85.811—

    Other specified disorders of bone density and structure, right shoulder

  • M85.812—

    Other specified disorders of bone density and structure, left shoulder

  • M85.819—

    Other specified disorders of bone density and structure, unspecified shoulder

  • M85.821—

    Other specified disorders of bone density and structure, right upper arm

  • M85.822—

    Other specified disorders of bone density and structure, left upper arm

  • M85.829—

    Other specified disorders of bone density and structure, unspecified upper arm

  • M85.831—

    Other specified disorders of bone density and structure, right forearm

  • M85.832—

    Other specified disorders of bone density and structure, left forearm

  • M85.839—

    Other specified disorders of bone density and structure, unspecified forearm

  • M85.841—

    Other specified disorders of bone density and structure, right hand

  • M85.842—

    Other specified disorders of bone density and structure, left hand

  • M85.849—

    Other specified disorders of bone density and structure, unspecified hand

  • M85.851—

    Other specified disorders of bone density and structure, right thigh

  • M85.852—

    Other specified disorders of bone density and structure, left thigh

  • M85.859—

    Other specified disorders of bone density and structure, unspecified thigh

  • M85.861—

    Other specified disorders of bone density and structure, right lower leg

  • M85.862—

    Other specified disorders of bone density and structure, left lower leg

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