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
  • M87.262

    Osteonecrosis due to previous trauma, left tibia

  • M87.263

    Osteonecrosis due to previous trauma, unspecified tibia

  • M87.264

    Osteonecrosis due to previous trauma, right fibula

  • M87.265

    Osteonecrosis due to previous trauma, left fibula

  • M87.266

    Osteonecrosis due to previous trauma, unspecified fibula

  • M87.271

    Osteonecrosis due to previous trauma, right ankle

  • M87.272

    Osteonecrosis due to previous trauma, left ankle

  • M87.273

    Osteonecrosis due to previous trauma, unspecified ankle

  • M87.274

    Osteonecrosis due to previous trauma, right foot

  • M87.275

    Osteonecrosis due to previous trauma, left foot

  • M87.276

    Osteonecrosis due to previous trauma, unspecified foot

  • M87.277

    Osteonecrosis due to previous trauma, right toe(s)

  • M87.278

    Osteonecrosis due to previous trauma, left toe(s)

  • M87.279

    Osteonecrosis due to previous trauma, unspecified toe(s)

  • M87.28

    Osteonecrosis due to previous trauma, other site

  • M87.29

    Osteonecrosis due to previous trauma, multiple sites

  • M87.30

    Other secondary osteonecrosis, unspecified bone

  • M87.311

    Other secondary osteonecrosis, right shoulder

  • M87.312

    Other secondary osteonecrosis, left shoulder

  • M87.319

    Other secondary osteonecrosis, unspecified shoulder

  • M87.321

    Other secondary osteonecrosis, right humerus

  • M87.322

    Other secondary osteonecrosis, left humerus

  • M87.329

    Other secondary osteonecrosis, unspecified humerus

  • M87.331

    Other secondary osteonecrosis of right radius

  • M87.332

    Other secondary osteonecrosis of left radius

  • M87.333

    Other secondary osteonecrosis of unspecified radius

  • M87.334

    Other secondary osteonecrosis of right ulna

  • M87.335

    Other secondary osteonecrosis of left ulna

  • M87.336

    Other secondary osteonecrosis of unspecified ulna

  • M87.337

    Other secondary osteonecrosis of right carpus

  • M87.338

    Other secondary osteonecrosis of left carpus

  • M87.339

    Other secondary osteonecrosis of unspecified carpus

  • M87.341

    Other secondary osteonecrosis, right hand

  • M87.342

    Other secondary osteonecrosis, left hand

  • M87.343

    Other secondary osteonecrosis, unspecified hand

  • M87.344

    Other secondary osteonecrosis, right finger(s)

  • M87.345

    Other secondary osteonecrosis, left finger(s)

  • M87.346

    Other secondary osteonecrosis, unspecified finger(s)

  • M87.350

    Other secondary osteonecrosis, pelvis

  • M87.351

    Other secondary osteonecrosis, right femur

  • M87.352

    Other secondary osteonecrosis, left femur

  • M87.353

    Other secondary osteonecrosis, unspecified femur

  • M87.361

    Other secondary osteonecrosis, right tibia

  • M87.362

    Other secondary osteonecrosis, left tibia

  • M87.363

    Other secondary osteonecrosis, unspecified tibia

  • M87.364

    Other secondary osteonecrosis, right fibula

  • M87.365

    Other secondary osteonecrosis, left fibula

  • M87.366

    Other secondary osteonecrosis, unspecified fibula

  • M87.371

    Other secondary osteonecrosis, right ankle

  • M87.372

    Other secondary osteonecrosis, left ankle

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