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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  • M65.051—

    Abscess of tendon sheath, right thigh

  • M65.052—

    Abscess of tendon sheath, left thigh

  • M65.059—

    Abscess of tendon sheath, unspecified thigh

  • M65.06—

    Abscess of tendon sheath, lower leg

  • M65.061—

    Abscess of tendon sheath, right lower leg

  • M65.062—

    Abscess of tendon sheath, left lower leg

  • M65.069—

    Abscess of tendon sheath, unspecified lower leg

  • M65.07—

    Abscess of tendon sheath, ankle and foot

  • M65.071—

    Abscess of tendon sheath, right ankle and foot

  • M65.072—

    Abscess of tendon sheath, left ankle and foot

  • M65.079—

    Abscess of tendon sheath, unspecified ankle and foot

  • M65.08—

    Abscess of tendon sheath, other site

  • M65.1—

    Other infective (teno)synovitis

  • M65.10—

    Other infective (teno)synovitis, unspecified site

  • M65.11—

    Other infective (teno)synovitis, shoulder

  • M65.111—

    Other infective (teno)synovitis, right shoulder

  • M65.112—

    Other infective (teno)synovitis, left shoulder

  • M65.119—

    Other infective (teno)synovitis, unspecified shoulder

  • M65.12—

    Other infective (teno)synovitis, elbow

  • M65.121—

    Other infective (teno)synovitis, right elbow

  • M65.122—

    Other infective (teno)synovitis, left elbow

  • M65.129—

    Other infective (teno)synovitis, unspecified elbow

  • M65.13—

    Other infective (teno)synovitis, wrist

  • M65.131—

    Other infective (teno)synovitis, right wrist

  • M65.132—

    Other infective (teno)synovitis, left wrist

  • M65.139—

    Other infective (teno)synovitis, unspecified wrist

  • M65.14—

    Other infective (teno)synovitis, hand

  • M65.141—

    Other infective (teno)synovitis, right hand

  • M65.142—

    Other infective (teno)synovitis, left hand

  • M65.149—

    Other infective (teno)synovitis, unspecified hand

  • M65.15—

    Other infective (teno)synovitis, hip

  • M65.151—

    Other infective (teno)synovitis, right hip

  • M65.152—

    Other infective (teno)synovitis, left hip

  • M65.159—

    Other infective (teno)synovitis, unspecified hip

  • M65.16—

    Other infective (teno)synovitis, knee

  • M65.161—

    Other infective (teno)synovitis, right knee

  • M65.162—

    Other infective (teno)synovitis, left knee

  • M65.169—

    Other infective (teno)synovitis, unspecified knee

  • M65.17—

    Other infective (teno)synovitis, ankle and foot

  • M65.171—

    Other infective (teno)synovitis, right ankle and foot

  • M65.172—

    Other infective (teno)synovitis, left ankle and foot

  • M65.179—

    Other infective (teno)synovitis, unspecified ankle and foot

  • M65.18—

    Other infective (teno)synovitis, other site

  • M65.19—

    Other infective (teno)synovitis, multiple sites

  • M65.2—

    Calcific tendinitis

  • M65.20—

    Calcific tendinitis, unspecified site

  • M65.22—

    Calcific tendinitis, upper arm

  • M65.221—

    Calcific tendinitis, right upper arm

  • M65.222—

    Calcific tendinitis, left upper arm

  • M65.229—

    Calcific tendinitis, unspecified upper arm

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