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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  • M65.262—

    Calcific tendinitis, left lower leg

  • M65.269—

    Calcific tendinitis, unspecified lower leg

  • M65.271—

    Calcific tendinitis, right ankle and foot

  • M65.272—

    Calcific tendinitis, left ankle and foot

  • M65.279—

    Calcific tendinitis, unspecified ankle and foot

  • M65.28—

    Calcific tendinitis, other site

  • M65.29—

    Calcific tendinitis, multiple sites

  • M65.30—

    Trigger finger, unspecified finger

  • M65.311—

    Trigger thumb, right thumb

  • M65.312—

    Trigger thumb, left thumb

  • M65.319—

    Trigger thumb, unspecified thumb

  • M65.321—

    Trigger finger, right index finger

  • M65.322—

    Trigger finger, left index finger

  • M65.329—

    Trigger finger, unspecified index finger

  • M65.331—

    Trigger finger, right middle finger

  • M65.332—

    Trigger finger, left middle finger

  • M65.339—

    Trigger finger, unspecified middle finger

  • M65.341—

    Trigger finger, right ring finger

  • M65.342—

    Trigger finger, left ring finger

  • M65.349—

    Trigger finger, unspecified ring finger

  • M65.351—

    Trigger finger, right little finger

  • M65.352—

    Trigger finger, left little finger

  • M65.359—

    Trigger finger, unspecified little finger

  • M65.4—

    Radial styloid tenosynovitis [de Quervain]

  • M65.80—

    Other synovitis and tenosynovitis, unspecified site

  • M65.811—

    Other synovitis and tenosynovitis, right shoulder

  • M65.812—

    Other synovitis and tenosynovitis, left shoulder

  • M65.819—

    Other synovitis and tenosynovitis, unspecified shoulder

  • 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

  • M65.831—

    Other synovitis and tenosynovitis, right forearm

  • M65.832—

    Other synovitis and tenosynovitis, left forearm

  • M65.839—

    Other synovitis and tenosynovitis, unspecified forearm

  • M65.841—

    Other synovitis and tenosynovitis, right hand

  • M65.842—

    Other synovitis and tenosynovitis, left hand

  • M65.849—

    Other synovitis and tenosynovitis, unspecified hand

  • M65.851—

    Other synovitis and tenosynovitis, right thigh

  • M65.852—

    Other synovitis and tenosynovitis, left thigh

  • M65.859—

    Other synovitis and tenosynovitis, unspecified thigh

  • 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

  • M65.871—

    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

  • M65.90—

    Unspecified synovitis and tenosynovitis, unspecified site

  • M65.911—

    Unspecified synovitis and tenosynovitis, right shoulder

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