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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  • M65.961—

    Unspecified synovitis and tenosynovitis, right lower leg

  • M65.962—

    Unspecified synovitis and tenosynovitis, left lower leg

  • M65.969—

    Unspecified synovitis and tenosynovitis, unspecified lower leg

  • M65.97—

    Unspecified synovitis and tenosynovitis, ankle and foot

  • M65.971—

    Unspecified synovitis and tenosynovitis, right ankle and foot

  • M65.972—

    Unspecified synovitis and tenosynovitis, left ankle and foot

  • M65.979—

    Unspecified synovitis and tenosynovitis, unspecified ankle and foot

  • M65.98—

    Unspecified synovitis and tenosynovitis, other site

  • M65.99—

    Unspecified synovitis and tenosynovitis, multiple sites

  • M66—

    Spontaneous rupture of synovium and tendon

  • M66.0—

    Rupture of popliteal cyst

  • M66.1—

    Rupture of synovium

  • M66.10—

    Rupture of synovium, unspecified joint

  • M66.11—

    Rupture of synovium, shoulder

  • M66.111—

    Rupture of synovium, right shoulder

  • M66.112—

    Rupture of synovium, left shoulder

  • M66.119—

    Rupture of synovium, unspecified shoulder

  • M66.12—

    Rupture of synovium, elbow

  • M66.121—

    Rupture of synovium, right elbow

  • M66.122—

    Rupture of synovium, left elbow

  • M66.129—

    Rupture of synovium, unspecified elbow

  • M66.13—

    Rupture of synovium, wrist

  • M66.131—

    Rupture of synovium, right wrist

  • M66.132—

    Rupture of synovium, left wrist

  • M66.139—

    Rupture of synovium, unspecified wrist

  • M66.14—

    Rupture of synovium, hand and fingers

  • M66.141—

    Rupture of synovium, right hand

  • M66.142—

    Rupture of synovium, left hand

  • M66.143—

    Rupture of synovium, unspecified hand

  • M66.144—

    Rupture of synovium, right finger(s)

  • M66.145—

    Rupture of synovium, left finger(s)

  • M66.146—

    Rupture of synovium, unspecified finger(s)

  • M66.15—

    Rupture of synovium, hip

  • M66.151—

    Rupture of synovium, right hip

  • M66.152—

    Rupture of synovium, left hip

  • M66.159—

    Rupture of synovium, unspecified hip

  • M66.17—

    Rupture of synovium, ankle, foot and toes

  • M66.171—

    Rupture of synovium, right ankle

  • M66.172—

    Rupture of synovium, left ankle

  • M66.173—

    Rupture of synovium, unspecified ankle

  • M66.174—

    Rupture of synovium, right foot

  • M66.175—

    Rupture of synovium, left foot

  • M66.176—

    Rupture of synovium, unspecified foot

  • M66.177—

    Rupture of synovium, right toe(s)

  • M66.178—

    Rupture of synovium, left toe(s)

  • M66.179—

    Rupture of synovium, unspecified toe(s)

  • M66.18—

    Rupture of synovium, other site

  • M66.2—

    Spontaneous rupture of extensor tendons

  • M66.20—

    Spontaneous rupture of extensor tendons, unspecified site

  • M66.21—

    Spontaneous rupture of extensor tendons, shoulder

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