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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  • M62.58—

    Muscle wasting and atrophy, not elsewhere classified, other site

  • M62.59—

    Muscle wasting and atrophy, not elsewhere classified, multiple sites

  • M62.5A0—

    Muscle wasting and atrophy, not elsewhere classified, back, cervical

  • M62.5A1—

    Muscle wasting and atrophy, not elsewhere classified, back, thoracic

  • M62.5A2—

    Muscle wasting and atrophy, not elsewhere classified, back, lumbosacral

  • M62.5A9—

    Muscle wasting and atrophy, not elsewhere classified, back, unspecified level

  • M62.81—

    Muscle weakness (generalized)

  • M62.82—

    Rhabdomyolysis

  • M62.830—

    Muscle spasm of back

  • M62.831—

    Muscle spasm of calf

  • M62.838—

    Other muscle spasm

  • M62.84—

    Sarcopenia

  • M62.85—

    Dysfunction of the multifidus muscles, lumbar region

  • M62.89—

    Other specified disorders of muscle

  • M62.9—

    Disorder of muscle, unspecified

  • M63.80—

    Disorders of muscle in diseases classified elsewhere, unspecified site

  • M63.811—

    Disorders of muscle in diseases classified elsewhere, right shoulder

  • M63.812—

    Disorders of muscle in diseases classified elsewhere, left shoulder

  • M63.819—

    Disorders of muscle in diseases classified elsewhere, unspecified shoulder

  • M63.821—

    Disorders of muscle in diseases classified elsewhere, right upper arm

  • M63.822—

    Disorders of muscle in diseases classified elsewhere, left upper arm

  • M63.829—

    Disorders of muscle in diseases classified elsewhere, unspecified upper arm

  • M63.831—

    Disorders of muscle in diseases classified elsewhere, right forearm

  • M63.832—

    Disorders of muscle in diseases classified elsewhere, left forearm

  • M63.839—

    Disorders of muscle in diseases classified elsewhere, unspecified forearm

  • M63.841—

    Disorders of muscle in diseases classified elsewhere, right hand

  • M63.842—

    Disorders of muscle in diseases classified elsewhere, left hand

  • M63.849—

    Disorders of muscle in diseases classified elsewhere, unspecified hand

  • M63.851—

    Disorders of muscle in diseases classified elsewhere, right thigh

  • M63.852—

    Disorders of muscle in diseases classified elsewhere, left thigh

  • M63.859—

    Disorders of muscle in diseases classified elsewhere, unspecified thigh

  • M63.861—

    Disorders of muscle in diseases classified elsewhere, right lower leg

  • M63.862—

    Disorders of muscle in diseases classified elsewhere, left lower leg

  • M63.869—

    Disorders of muscle in diseases classified elsewhere, unspecified lower leg

  • M63.871—

    Disorders of muscle in diseases classified elsewhere, right ankle and foot

  • M63.872—

    Disorders of muscle in diseases classified elsewhere, left ankle and foot

  • M63.879—

    Disorders of muscle in diseases classified elsewhere, unspecified ankle and foot

  • M63.88—

    Disorders of muscle in diseases classified elsewhere, other site

  • M63.89—

    Disorders of muscle in diseases classified elsewhere, multiple sites

  • M65.00—

    Abscess of tendon sheath, unspecified site

  • M65.011—

    Abscess of tendon sheath, right shoulder

  • M65.012—

    Abscess of tendon sheath, left shoulder

  • M65.019—

    Abscess of tendon sheath, unspecified shoulder

  • M65.021—

    Abscess of tendon sheath, right upper arm

  • M65.022—

    Abscess of tendon sheath, left upper arm

  • M65.029—

    Abscess of tendon sheath, unspecified upper arm

  • M65.031—

    Abscess of tendon sheath, right forearm

  • M65.032—

    Abscess of tendon sheath, left forearm

  • M65.039—

    Abscess of tendon sheath, unspecified forearm

  • M65.041—

    Abscess of tendon sheath, right hand

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