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)
Internal Codes
  • M62.241

    Nontraumatic ischemic infarction of muscle, right hand

  • M62.242

    Nontraumatic ischemic infarction of muscle, left hand

  • M62.249

    Nontraumatic ischemic infarction of muscle, unspecified hand

  • M62.25

    Nontraumatic ischemic infarction of muscle, thigh

  • M62.251

    Nontraumatic ischemic infarction of muscle, right thigh

  • M62.252

    Nontraumatic ischemic infarction of muscle, left thigh

  • M62.259

    Nontraumatic ischemic infarction of muscle, unspecified thigh

  • M62.26

    Nontraumatic ischemic infarction of muscle, lower leg

  • M62.261

    Nontraumatic ischemic infarction of muscle, right lower leg

  • M62.262

    Nontraumatic ischemic infarction of muscle, left lower leg

  • M62.269

    Nontraumatic ischemic infarction of muscle, unspecified lower leg

  • M62.27

    Nontraumatic ischemic infarction of muscle, ankle and foot

  • M62.271

    Nontraumatic ischemic infarction of muscle, right ankle and foot

  • M62.272

    Nontraumatic ischemic infarction of muscle, left ankle and foot

  • M62.279

    Nontraumatic ischemic infarction of muscle, unspecified ankle and foot

  • M62.28

    Nontraumatic ischemic infarction of muscle, other site

  • M62.3

    Immobility syndrome (paraplegic)

  • M62.4

    Contracture of muscle

  • M62.40

    Contracture of muscle, unspecified site

  • M62.41

    Contracture of muscle, shoulder

  • M62.411

    Contracture of muscle, right shoulder

  • M62.412

    Contracture of muscle, left shoulder

  • M62.419

    Contracture of muscle, unspecified shoulder

  • M62.42

    Contracture of muscle, upper arm

  • M62.421

    Contracture of muscle, right upper arm

  • M62.422

    Contracture of muscle, left upper arm

  • M62.429

    Contracture of muscle, unspecified upper arm

  • M62.43

    Contracture of muscle, forearm

  • M62.431

    Contracture of muscle, right forearm

  • M62.432

    Contracture of muscle, left forearm

  • M62.439

    Contracture of muscle, unspecified forearm

  • M62.44

    Contracture of muscle, hand

  • M62.441

    Contracture of muscle, right hand

  • M62.442

    Contracture of muscle, left hand

  • M62.449

    Contracture of muscle, unspecified hand

  • M62.45

    Contracture of muscle, thigh

  • M62.451

    Contracture of muscle, right thigh

  • M62.452

    Contracture of muscle, left thigh

  • M62.459

    Contracture of muscle, unspecified thigh

  • M62.46

    Contracture of muscle, lower leg

  • M62.461

    Contracture of muscle, right lower leg

  • M62.462

    Contracture of muscle, left lower leg

  • M62.469

    Contracture of muscle, unspecified lower leg

  • M62.47

    Contracture of muscle, ankle and foot

  • M62.471

    Contracture of muscle, right ankle and foot

  • M62.472

    Contracture of muscle, left ankle and foot

  • M62.479

    Contracture of muscle, unspecified ankle and foot

  • M62.48

    Contracture of muscle, other site

  • M62.49

    Contracture of muscle, multiple sites

  • M62.5

    Muscle wasting and atrophy, not elsewhere classified

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