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
  • M87.09

    Idiopathic aseptic necrosis of bone, multiple sites

  • M87.1

    Osteonecrosis due to drugs

  • M87.10

    Osteonecrosis due to drugs, unspecified bone

  • M87.11

    Osteonecrosis due to drugs, shoulder

  • M87.111

    Osteonecrosis due to drugs, right shoulder

  • M87.112

    Osteonecrosis due to drugs, left shoulder

  • M87.119

    Osteonecrosis due to drugs, unspecified shoulder

  • M87.12

    Osteonecrosis due to drugs, humerus

  • M87.121

    Osteonecrosis due to drugs, right humerus

  • M87.122

    Osteonecrosis due to drugs, left humerus

  • M87.129

    Osteonecrosis due to drugs, unspecified humerus

  • M87.13

    Osteonecrosis due to drugs of radius, ulna and carpus

  • M87.131

    Osteonecrosis due to drugs of right radius

  • M87.132

    Osteonecrosis due to drugs of left radius

  • M87.133

    Osteonecrosis due to drugs of unspecified radius

  • M87.134

    Osteonecrosis due to drugs of right ulna

  • M87.135

    Osteonecrosis due to drugs of left ulna

  • M87.136

    Osteonecrosis due to drugs of unspecified ulna

  • M87.137

    Osteonecrosis due to drugs of right carpus

  • M87.138

    Osteonecrosis due to drugs of left carpus

  • M87.139

    Osteonecrosis due to drugs of unspecified carpus

  • M87.14

    Osteonecrosis due to drugs, hand and fingers

  • M87.141

    Osteonecrosis due to drugs, right hand

  • M87.142

    Osteonecrosis due to drugs, left hand

  • M87.143

    Osteonecrosis due to drugs, unspecified hand

  • M87.144

    Osteonecrosis due to drugs, right finger(s)

  • M87.145

    Osteonecrosis due to drugs, left finger(s)

  • M87.146

    Osteonecrosis due to drugs, unspecified finger(s)

  • M87.15

    Osteonecrosis due to drugs, pelvis and femur

  • M87.150

    Osteonecrosis due to drugs, pelvis

  • M87.151

    Osteonecrosis due to drugs, right femur

  • M87.152

    Osteonecrosis due to drugs, left femur

  • M87.159

    Osteonecrosis due to drugs, unspecified femur

  • M87.16

    Osteonecrosis due to drugs, tibia and fibula

  • M87.161

    Osteonecrosis due to drugs, right tibia

  • M87.162

    Osteonecrosis due to drugs, left tibia

  • M87.163

    Osteonecrosis due to drugs, unspecified tibia

  • M87.164

    Osteonecrosis due to drugs, right fibula

  • M87.165

    Osteonecrosis due to drugs, left fibula

  • M87.166

    Osteonecrosis due to drugs, unspecified fibula

  • M87.17

    Osteonecrosis due to drugs, ankle, foot and toes

  • M87.171

    Osteonecrosis due to drugs, right ankle

  • M87.172

    Osteonecrosis due to drugs, left ankle

  • M87.173

    Osteonecrosis due to drugs, unspecified ankle

  • M87.174

    Osteonecrosis due to drugs, right foot

  • M87.175

    Osteonecrosis due to drugs, left foot

  • M87.176

    Osteonecrosis due to drugs, unspecified foot

  • M87.177

    Osteonecrosis due to drugs, right toe(s)

  • M87.178

    Osteonecrosis due to drugs, left toe(s)

  • M87.179

    Osteonecrosis due to drugs, unspecified toe(s)

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