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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  • M65.819—

    Other synovitis and tenosynovitis, unspecified shoulder

  • M65.82—

    Other synovitis and tenosynovitis, upper arm

  • M65.821—

    Other synovitis and tenosynovitis, right upper arm

  • M65.822—

    Other synovitis and tenosynovitis, left upper arm

  • M65.829—

    Other synovitis and tenosynovitis, unspecified upper arm

  • M65.83—

    Other synovitis and tenosynovitis, forearm

  • M65.831—

    Other synovitis and tenosynovitis, right forearm

  • M65.832—

    Other synovitis and tenosynovitis, left forearm

  • M65.839—

    Other synovitis and tenosynovitis, unspecified forearm

  • M65.84—

    Other synovitis and tenosynovitis, hand

  • M65.841—

    Other synovitis and tenosynovitis, right hand

  • M65.842—

    Other synovitis and tenosynovitis, left hand

  • M65.849—

    Other synovitis and tenosynovitis, unspecified hand

  • M65.85—

    Other synovitis and tenosynovitis, thigh

  • M65.851—

    Other synovitis and tenosynovitis, right thigh

  • M65.852—

    Other synovitis and tenosynovitis, left thigh

  • M65.859—

    Other synovitis and tenosynovitis, unspecified thigh

  • M65.86—

    Other synovitis and tenosynovitis, lower leg

  • M65.861—

    Other synovitis and tenosynovitis, right lower leg

  • M65.862—

    Other synovitis and tenosynovitis, left lower leg

  • M65.869—

    Other synovitis and tenosynovitis, unspecified lower leg

  • M65.87—

    Other synovitis and tenosynovitis, ankle and foot

  • M65.871—

    Other synovitis and tenosynovitis, right ankle and foot

  • M65.872—

    Other synovitis and tenosynovitis, left ankle and foot

  • M65.879—

    Other synovitis and tenosynovitis, unspecified ankle and foot

  • M65.88—

    Other synovitis and tenosynovitis, other site

  • M65.89—

    Other synovitis and tenosynovitis, multiple sites

  • M65.9—

    Synovitis and tenosynovitis, unspecified

  • M65.90—

    Unspecified synovitis and tenosynovitis, unspecified site

  • M65.91—

    Unspecified synovitis and tenosynovitis, shoulder

  • M65.911—

    Unspecified synovitis and tenosynovitis, right shoulder

  • M65.912—

    Unspecified synovitis and tenosynovitis, left shoulder

  • M65.919—

    Unspecified synovitis and tenosynovitis, unspecified shoulder

  • M65.92—

    Unspecified synovitis and tenosynovitis, upper arm

  • M65.921—

    Unspecified synovitis and tenosynovitis, right upper arm

  • M65.922—

    Unspecified synovitis and tenosynovitis, left upper arm

  • M65.929—

    Unspecified synovitis and tenosynovitis, unspecified upper arm

  • M65.93—

    Unspecified synovitis and tenosynovitis, forearm

  • M65.931—

    Unspecified synovitis and tenosynovitis, right forearm

  • M65.932—

    Unspecified synovitis and tenosynovitis, left forearm

  • M65.939—

    Unspecified synovitis and tenosynovitis, unspecified forearm

  • M65.94—

    Unspecified synovitis and tenosynovitis, hand

  • M65.941—

    Unspecified synovitis and tenosynovitis, right hand

  • M65.942—

    Unspecified synovitis and tenosynovitis, left hand

  • M65.949—

    Unspecified synovitis and tenosynovitis, unspecified hand

  • M65.95—

    Unspecified synovitis and tenosynovitis, thigh

  • M65.951—

    Unspecified synovitis and tenosynovitis, right thigh

  • M65.952—

    Unspecified synovitis and tenosynovitis, left thigh

  • M65.959—

    Unspecified synovitis and tenosynovitis, unspecified thigh

  • M65.96—

    Unspecified synovitis and tenosynovitis, lower leg

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