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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  • M77.01—

    Medial epicondylitis, right elbow

  • M77.02—

    Medial epicondylitis, left elbow

  • M77.10—

    Lateral epicondylitis, unspecified elbow

  • M77.11—

    Lateral epicondylitis, right elbow

  • M77.12—

    Lateral epicondylitis, left elbow

  • M77.20—

    Periarthritis, unspecified wrist

  • M77.21—

    Periarthritis, right wrist

  • M77.22—

    Periarthritis, left wrist

  • M77.30—

    Calcaneal spur, unspecified foot

  • M77.31—

    Calcaneal spur, right foot

  • M77.32—

    Calcaneal spur, left foot

  • M77.40—

    Metatarsalgia, unspecified foot

  • M77.41—

    Metatarsalgia, right foot

  • M77.42—

    Metatarsalgia, left foot

  • M77.50—

    Other enthesopathy of unspecified foot and ankle

  • M77.51—

    Other enthesopathy of right foot and ankle

  • M77.52—

    Other enthesopathy of left foot and ankle

  • M77.8—

    Other enthesopathies, not elsewhere classified

  • M77.9—

    Enthesopathy, unspecified

  • M79.0—

    Rheumatism, unspecified

  • M79.10—

    Myalgia, unspecified site

  • M79.11—

    Myalgia of mastication muscle

  • M79.12—

    Myalgia of auxiliary muscles, head and neck

  • M79.18—

    Myalgia, other site

  • M79.2—

    Neuralgia and neuritis, unspecified

  • M79.3—

    Panniculitis, unspecified

  • M79.4—

    Hypertrophy of (infrapatellar) fat pad

  • M79.5—

    Residual foreign body in soft tissue

  • M79.601—

    Pain in right arm

  • M79.602—

    Pain in left arm

  • M79.603—

    Pain in arm, unspecified

  • M79.604—

    Pain in right leg

  • M79.605—

    Pain in left leg

  • M79.606—

    Pain in leg, unspecified

  • M79.609—

    Pain in unspecified limb

  • M79.621—

    Pain in right upper arm

  • M79.622—

    Pain in left upper arm

  • M79.629—

    Pain in unspecified upper arm

  • M79.631—

    Pain in right forearm

  • M79.632—

    Pain in left forearm

  • M79.639—

    Pain in unspecified forearm

  • M79.641—

    Pain in right hand

  • M79.642—

    Pain in left hand

  • M79.643—

    Pain in unspecified hand

  • M79.644—

    Pain in right finger(s)

  • M79.645—

    Pain in left finger(s)

  • M79.646—

    Pain in unspecified finger(s)

  • M79.651—

    Pain in right thigh

  • M79.652—

    Pain in left thigh

  • M79.659—

    Pain in unspecified thigh

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