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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  • M85.449—

    Solitary bone cyst, unspecified hand

  • M85.45—

    Solitary bone cyst, pelvis

  • M85.451—

    Solitary bone cyst, right pelvis

  • M85.452—

    Solitary bone cyst, left pelvis

  • M85.459—

    Solitary bone cyst, unspecified pelvis

  • M85.46—

    Solitary bone cyst, tibia and fibula

  • M85.461—

    Solitary bone cyst, right tibia and fibula

  • M85.462—

    Solitary bone cyst, left tibia and fibula

  • M85.469—

    Solitary bone cyst, unspecified tibia and fibula

  • M85.47—

    Solitary bone cyst, ankle and foot

  • M85.471—

    Solitary bone cyst, right ankle and foot

  • M85.472—

    Solitary bone cyst, left ankle and foot

  • M85.479—

    Solitary bone cyst, unspecified ankle and foot

  • M85.48—

    Solitary bone cyst, other site

  • M85.5—

    Aneurysmal bone cyst

  • M85.50—

    Aneurysmal bone cyst, unspecified site

  • M85.51—

    Aneurysmal bone cyst, shoulder

  • M85.511—

    Aneurysmal bone cyst, right shoulder

  • M85.512—

    Aneurysmal bone cyst, left shoulder

  • M85.519—

    Aneurysmal bone cyst, unspecified shoulder

  • M85.52—

    Aneurysmal bone cyst, upper arm

  • M85.521—

    Aneurysmal bone cyst, right upper arm

  • M85.522—

    Aneurysmal bone cyst, left upper arm

  • M85.529—

    Aneurysmal bone cyst, unspecified upper arm

  • M85.53—

    Aneurysmal bone cyst, forearm

  • M85.531—

    Aneurysmal bone cyst, right forearm

  • M85.532—

    Aneurysmal bone cyst, left forearm

  • M85.539—

    Aneurysmal bone cyst, unspecified forearm

  • M85.54—

    Aneurysmal bone cyst, hand

  • M85.541—

    Aneurysmal bone cyst, right hand

  • M85.542—

    Aneurysmal bone cyst, left hand

  • M85.549—

    Aneurysmal bone cyst, unspecified hand

  • M85.55—

    Aneurysmal bone cyst, thigh

  • M85.551—

    Aneurysmal bone cyst, right thigh

  • M85.552—

    Aneurysmal bone cyst, left thigh

  • M85.559—

    Aneurysmal bone cyst, unspecified thigh

  • M85.56—

    Aneurysmal bone cyst, lower leg

  • M85.561—

    Aneurysmal bone cyst, right lower leg

  • M85.562—

    Aneurysmal bone cyst, left lower leg

  • M85.569—

    Aneurysmal bone cyst, unspecified lower leg

  • M85.57—

    Aneurysmal bone cyst, ankle and foot

  • 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

  • M85.6—

    Other cyst of bone

  • M85.60—

    Other cyst of bone, unspecified site

  • M85.61—

    Other cyst of bone, shoulder

  • M85.611—

    Other cyst of bone, right shoulder

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