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
  • M84.363G

    Stress fracture, right fibula, subsequent encounter for fracture with delayed healing

  • M84.363K

    Stress fracture, right fibula, subsequent encounter for fracture with nonunion

  • M84.363P

    Stress fracture, right fibula, subsequent encounter for fracture with malunion

  • M84.363S

    Stress fracture, right fibula, sequela

  • M84.364

    Stress fracture, left fibula

  • M84.364A

    Stress fracture, left fibula, initial encounter for fracture

  • M84.364D

    Stress fracture, left fibula, subsequent encounter for fracture with routine healing

  • M84.364G

    Stress fracture, left fibula, subsequent encounter for fracture with delayed healing

  • M84.364K

    Stress fracture, left fibula, subsequent encounter for fracture with nonunion

  • M84.364P

    Stress fracture, left fibula, subsequent encounter for fracture with malunion

  • M84.364S

    Stress fracture, left fibula, sequela

  • M84.369

    Stress fracture, unspecified tibia and fibula

  • M84.369A

    Stress fracture, unspecified tibia and fibula, initial encounter for fracture

  • M84.369D

    Stress fracture, unspecified tibia and fibula, subsequent encounter for fracture with routine healing

  • M84.369G

    Stress fracture, unspecified tibia and fibula, subsequent encounter for fracture with delayed healing

  • M84.369K

    Stress fracture, unspecified tibia and fibula, subsequent encounter for fracture with nonunion

  • M84.369P

    Stress fracture, unspecified tibia and fibula, subsequent encounter for fracture with malunion

  • M84.369S

    Stress fracture, unspecified tibia and fibula, sequela

  • M84.37

    Stress fracture, ankle, foot and toes

  • M84.371

    Stress fracture, right ankle

  • M84.371A

    Stress fracture, right ankle, initial encounter for fracture

  • M84.371D

    Stress fracture, right ankle, subsequent encounter for fracture with routine healing

  • M84.371G

    Stress fracture, right ankle, subsequent encounter for fracture with delayed healing

  • M84.371K

    Stress fracture, right ankle, subsequent encounter for fracture with nonunion

  • M84.371P

    Stress fracture, right ankle, subsequent encounter for fracture with malunion

  • M84.371S

    Stress fracture, right ankle, sequela

  • M84.372

    Stress fracture, left ankle

  • M84.372A

    Stress fracture, left ankle, initial encounter for fracture

  • M84.372D

    Stress fracture, left ankle, subsequent encounter for fracture with routine healing

  • M84.372G

    Stress fracture, left ankle, subsequent encounter for fracture with delayed healing

  • M84.372K

    Stress fracture, left ankle, subsequent encounter for fracture with nonunion

  • M84.372P

    Stress fracture, left ankle, subsequent encounter for fracture with malunion

  • M84.372S

    Stress fracture, left ankle, sequela

  • M84.373

    Stress fracture, unspecified ankle

  • M84.373A

    Stress fracture, unspecified ankle, initial encounter for fracture

  • M84.373D

    Stress fracture, unspecified ankle, subsequent encounter for fracture with routine healing

  • M84.373G

    Stress fracture, unspecified ankle, subsequent encounter for fracture with delayed healing

  • M84.373K

    Stress fracture, unspecified ankle, subsequent encounter for fracture with nonunion

  • M84.373P

    Stress fracture, unspecified ankle, subsequent encounter for fracture with malunion

  • M84.373S

    Stress fracture, unspecified ankle, sequela

  • M84.374

    Stress fracture, right foot

  • M84.374A

    Stress fracture, right foot, initial encounter for fracture

  • M84.374D

    Stress fracture, right foot, subsequent encounter for fracture with routine healing

  • M84.374G

    Stress fracture, right foot, subsequent encounter for fracture with delayed healing

  • M84.374K

    Stress fracture, right foot, subsequent encounter for fracture with nonunion

  • M84.374P

    Stress fracture, right foot, subsequent encounter for fracture with malunion

  • M84.374S

    Stress fracture, right foot, sequela

  • M84.375

    Stress fracture, left foot

  • M84.375A

    Stress fracture, left foot, initial encounter for fracture

  • M84.375D

    Stress fracture, left foot, subsequent encounter for fracture with routine healing

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