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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  • M85.049—

    Fibrous dysplasia (monostotic), unspecified hand

  • M85.051—

    Fibrous dysplasia (monostotic), right thigh

  • M85.052—

    Fibrous dysplasia (monostotic), left thigh

  • M85.059—

    Fibrous dysplasia (monostotic), unspecified thigh

  • M85.061—

    Fibrous dysplasia (monostotic), right lower leg

  • M85.062—

    Fibrous dysplasia (monostotic), left lower leg

  • M85.069—

    Fibrous dysplasia (monostotic), unspecified lower leg

  • M85.071—

    Fibrous dysplasia (monostotic), right ankle and foot

  • M85.072—

    Fibrous dysplasia (monostotic), left ankle and foot

  • M85.079—

    Fibrous dysplasia (monostotic), unspecified ankle and foot

  • M85.08—

    Fibrous dysplasia (monostotic), other site

  • M85.09—

    Fibrous dysplasia (monostotic), multiple sites

  • M85.10—

    Skeletal fluorosis, unspecified site

  • M85.111—

    Skeletal fluorosis, right shoulder

  • M85.112—

    Skeletal fluorosis, left shoulder

  • M85.119—

    Skeletal fluorosis, unspecified shoulder

  • M85.121—

    Skeletal fluorosis, right upper arm

  • M85.122—

    Skeletal fluorosis, left upper arm

  • M85.129—

    Skeletal fluorosis, unspecified upper arm

  • M85.131—

    Skeletal fluorosis, right forearm

  • M85.132—

    Skeletal fluorosis, left forearm

  • M85.139—

    Skeletal fluorosis, unspecified forearm

  • M85.141—

    Skeletal fluorosis, right hand

  • M85.142—

    Skeletal fluorosis, left hand

  • M85.149—

    Skeletal fluorosis, unspecified hand

  • M85.151—

    Skeletal fluorosis, right thigh

  • M85.152—

    Skeletal fluorosis, left thigh

  • M85.159—

    Skeletal fluorosis, unspecified thigh

  • M85.161—

    Skeletal fluorosis, right lower leg

  • M85.162—

    Skeletal fluorosis, left lower leg

  • M85.169—

    Skeletal fluorosis, unspecified lower leg

  • M85.171—

    Skeletal fluorosis, right ankle and foot

  • M85.172—

    Skeletal fluorosis, left ankle and foot

  • M85.179—

    Skeletal fluorosis, unspecified ankle and foot

  • M85.18—

    Skeletal fluorosis, other site

  • M85.19—

    Skeletal fluorosis, multiple sites

  • M85.2—

    Hyperostosis of skull

  • M85.30—

    Osteitis condensans, unspecified site

  • M85.311—

    Osteitis condensans, right shoulder

  • M85.312—

    Osteitis condensans, left shoulder

  • M85.319—

    Osteitis condensans, unspecified shoulder

  • M85.321—

    Osteitis condensans, right upper arm

  • M85.322—

    Osteitis condensans, left upper arm

  • M85.329—

    Osteitis condensans, unspecified upper arm

  • M85.331—

    Osteitis condensans, right forearm

  • M85.332—

    Osteitis condensans, left forearm

  • M85.339—

    Osteitis condensans, unspecified forearm

  • M85.341—

    Osteitis condensans, right hand

  • M85.342—

    Osteitis condensans, left hand

  • M85.349—

    Osteitis condensans, unspecified hand

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