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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  • M85.351—

    Osteitis condensans, right thigh

  • M85.352—

    Osteitis condensans, left thigh

  • M85.359—

    Osteitis condensans, unspecified thigh

  • M85.361—

    Osteitis condensans, right lower leg

  • M85.362—

    Osteitis condensans, left lower leg

  • M85.369—

    Osteitis condensans, unspecified lower leg

  • M85.371—

    Osteitis condensans, right ankle and foot

  • M85.372—

    Osteitis condensans, left ankle and foot

  • M85.379—

    Osteitis condensans, unspecified ankle and foot

  • M85.38—

    Osteitis condensans, other site

  • M85.39—

    Osteitis condensans, multiple sites

  • M85.40—

    Solitary bone cyst, unspecified site

  • M85.411—

    Solitary bone cyst, right shoulder

  • M85.412—

    Solitary bone cyst, left shoulder

  • M85.419—

    Solitary bone cyst, unspecified shoulder

  • M85.421—

    Solitary bone cyst, right humerus

  • M85.422—

    Solitary bone cyst, left humerus

  • M85.429—

    Solitary bone cyst, unspecified humerus

  • M85.431—

    Solitary bone cyst, right ulna and radius

  • M85.432—

    Solitary bone cyst, left ulna and radius

  • M85.439—

    Solitary bone cyst, unspecified ulna and radius

  • M85.441—

    Solitary bone cyst, right hand

  • M85.442—

    Solitary bone cyst, left hand

  • M85.449—

    Solitary bone cyst, unspecified hand

  • M85.451—

    Solitary bone cyst, right pelvis

  • M85.452—

    Solitary bone cyst, left pelvis

  • M85.459—

    Solitary bone cyst, unspecified pelvis

  • 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

  • M85.471—

    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

  • M85.50—

    Aneurysmal bone cyst, unspecified site

  • M85.511—

    Aneurysmal bone cyst, right shoulder

  • M85.512—

    Aneurysmal bone cyst, left shoulder

  • M85.519—

    Aneurysmal bone cyst, unspecified shoulder

  • M85.521—

    Aneurysmal bone cyst, right upper arm

  • M85.522—

    Aneurysmal bone cyst, left upper arm

  • M85.529—

    Aneurysmal bone cyst, unspecified upper arm

  • M85.531—

    Aneurysmal bone cyst, right forearm

  • M85.532—

    Aneurysmal bone cyst, left forearm

  • M85.539—

    Aneurysmal bone cyst, unspecified forearm

  • M85.541—

    Aneurysmal bone cyst, right hand

  • M85.542—

    Aneurysmal bone cyst, left hand

  • M85.549—

    Aneurysmal bone cyst, unspecified hand

  • M85.551—

    Aneurysmal bone cyst, right thigh

  • M85.552—

    Aneurysmal bone cyst, left thigh

  • M85.559—

    Aneurysmal bone cyst, unspecified thigh

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