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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  • M21.151—

    Varus deformity, not elsewhere classified, right hip

  • M21.152—

    Varus deformity, not elsewhere classified, left hip

  • M21.159—

    Varus deformity, not elsewhere classified, unspecified hip

  • M21.161—

    Varus deformity, not elsewhere classified, right knee

  • M21.162—

    Varus deformity, not elsewhere classified, left knee

  • M21.169—

    Varus deformity, not elsewhere classified, unspecified knee

  • M21.171—

    Varus deformity, not elsewhere classified, right ankle

  • M21.172—

    Varus deformity, not elsewhere classified, left ankle

  • M21.179—

    Varus deformity, not elsewhere classified, unspecified ankle

  • M21.20—

    Flexion deformity, unspecified site

  • M21.211—

    Flexion deformity, right shoulder

  • M21.212—

    Flexion deformity, left shoulder

  • M21.219—

    Flexion deformity, unspecified shoulder

  • M21.221—

    Flexion deformity, right elbow

  • M21.222—

    Flexion deformity, left elbow

  • M21.229—

    Flexion deformity, unspecified elbow

  • M21.231—

    Flexion deformity, right wrist

  • M21.232—

    Flexion deformity, left wrist

  • M21.239—

    Flexion deformity, unspecified wrist

  • M21.241—

    Flexion deformity, right finger joints

  • M21.242—

    Flexion deformity, left finger joints

  • M21.249—

    Flexion deformity, unspecified finger joints

  • M21.251—

    Flexion deformity, right hip

  • M21.252—

    Flexion deformity, left hip

  • M21.259—

    Flexion deformity, unspecified hip

  • M21.261—

    Flexion deformity, right knee

  • M21.262—

    Flexion deformity, left knee

  • M21.269—

    Flexion deformity, unspecified knee

  • M21.271—

    Flexion deformity, right ankle and toes

  • M21.272—

    Flexion deformity, left ankle and toes

  • M21.279—

    Flexion deformity, unspecified ankle and toes

  • M21.331—

    Wrist drop, right wrist

  • M21.332—

    Wrist drop, left wrist

  • M21.339—

    Wrist drop, unspecified wrist

  • M21.371—

    Foot drop, right foot

  • M21.372—

    Foot drop, left foot

  • M21.379—

    Foot drop, unspecified foot

  • M21.40—

    Flat foot [pes planus] (acquired), unspecified foot

  • M21.41—

    Flat foot [pes planus] (acquired), right foot

  • M21.42—

    Flat foot [pes planus] (acquired), left foot

  • M21.511—

    Acquired clawhand, right hand

  • M21.512—

    Acquired clawhand, left hand

  • M21.519—

    Acquired clawhand, unspecified hand

  • M21.521—

    Acquired clubhand, right hand

  • M21.522—

    Acquired clubhand, left hand

  • M21.529—

    Acquired clubhand, unspecified hand

  • M21.531—

    Acquired clawfoot, right foot

  • M21.532—

    Acquired clawfoot, left foot

  • M21.539—

    Acquired clawfoot, unspecified foot

  • M21.541—

    Acquired clubfoot, right foot

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