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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  • M85.2—

    Hyperostosis of skull

  • M85.3—

    Osteitis condensans

  • M85.30—

    Osteitis condensans, unspecified site

  • M85.31—

    Osteitis condensans, shoulder

  • M85.311—

    Osteitis condensans, right shoulder

  • M85.312—

    Osteitis condensans, left shoulder

  • M85.319—

    Osteitis condensans, unspecified shoulder

  • M85.32—

    Osteitis condensans, upper arm

  • M85.321—

    Osteitis condensans, right upper arm

  • M85.322—

    Osteitis condensans, left upper arm

  • M85.329—

    Osteitis condensans, unspecified upper arm

  • M85.33—

    Osteitis condensans, forearm

  • M85.331—

    Osteitis condensans, right forearm

  • M85.332—

    Osteitis condensans, left forearm

  • M85.339—

    Osteitis condensans, unspecified forearm

  • M85.34—

    Osteitis condensans, hand

  • M85.341—

    Osteitis condensans, right hand

  • M85.342—

    Osteitis condensans, left hand

  • M85.349—

    Osteitis condensans, unspecified hand

  • M85.35—

    Osteitis condensans, thigh

  • M85.351—

    Osteitis condensans, right thigh

  • M85.352—

    Osteitis condensans, left thigh

  • M85.359—

    Osteitis condensans, unspecified thigh

  • M85.36—

    Osteitis condensans, lower leg

  • M85.361—

    Osteitis condensans, right lower leg

  • M85.362—

    Osteitis condensans, left lower leg

  • M85.369—

    Osteitis condensans, unspecified lower leg

  • M85.37—

    Osteitis condensans, ankle and foot

  • 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

  • M85.4—

    Solitary bone cyst

  • M85.40—

    Solitary bone cyst, unspecified site

  • M85.41—

    Solitary bone cyst, shoulder

  • M85.411—

    Solitary bone cyst, right shoulder

  • M85.412—

    Solitary bone cyst, left shoulder

  • M85.419—

    Solitary bone cyst, unspecified shoulder

  • M85.42—

    Solitary bone cyst, humerus

  • M85.421—

    Solitary bone cyst, right humerus

  • M85.422—

    Solitary bone cyst, left humerus

  • M85.429—

    Solitary bone cyst, unspecified humerus

  • M85.43—

    Solitary bone cyst, ulna and radius

  • 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

  • M85.44—

    Solitary bone cyst, hand

  • M85.441—

    Solitary bone cyst, right hand

  • M85.442—

    Solitary bone cyst, left hand

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