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
  • M84.341S

    Stress fracture, right hand, sequela

  • M84.342

    Stress fracture, left hand

  • M84.342A

    Stress fracture, left hand, initial encounter for fracture

  • M84.342D

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

  • M84.342G

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

  • M84.342K

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

  • M84.342P

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

  • M84.342S

    Stress fracture, left hand, sequela

  • M84.343

    Stress fracture, unspecified hand

  • M84.343A

    Stress fracture, unspecified hand, initial encounter for fracture

  • M84.343D

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

  • M84.343G

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

  • M84.343K

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

  • M84.343P

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

  • M84.343S

    Stress fracture, unspecified hand, sequela

  • M84.344

    Stress fracture, right finger(s)

  • M84.344A

    Stress fracture, right finger(s), initial encounter for fracture

  • M84.344D

    Stress fracture, right finger(s), subsequent encounter for fracture with routine healing

  • M84.344G

    Stress fracture, right finger(s), subsequent encounter for fracture with delayed healing

  • M84.344K

    Stress fracture, right finger(s), subsequent encounter for fracture with nonunion

  • M84.344P

    Stress fracture, right finger(s), subsequent encounter for fracture with malunion

  • M84.344S

    Stress fracture, right finger(s), sequela

  • M84.345

    Stress fracture, left finger(s)

  • M84.345A

    Stress fracture, left finger(s), initial encounter for fracture

  • M84.345D

    Stress fracture, left finger(s), subsequent encounter for fracture with routine healing

  • M84.345G

    Stress fracture, left finger(s), subsequent encounter for fracture with delayed healing

  • M84.345K

    Stress fracture, left finger(s), subsequent encounter for fracture with nonunion

  • M84.345P

    Stress fracture, left finger(s), subsequent encounter for fracture with malunion

  • M84.345S

    Stress fracture, left finger(s), sequela

  • M84.346

    Stress fracture, unspecified finger(s)

  • M84.346A

    Stress fracture, unspecified finger(s), initial encounter for fracture

  • M84.346D

    Stress fracture, unspecified finger(s), subsequent encounter for fracture with routine healing

  • M84.346G

    Stress fracture, unspecified finger(s), subsequent encounter for fracture with delayed healing

  • M84.346K

    Stress fracture, unspecified finger(s), subsequent encounter for fracture with nonunion

  • M84.346P

    Stress fracture, unspecified finger(s), subsequent encounter for fracture with malunion

  • M84.346S

    Stress fracture, unspecified finger(s), sequela

  • M84.350

    Stress fracture, pelvis

  • M84.350A

    Stress fracture, pelvis, initial encounter for fracture

  • M84.350D

    Stress fracture, pelvis, subsequent encounter for fracture with routine healing

  • M84.350G

    Stress fracture, pelvis, subsequent encounter for fracture with delayed healing

  • M84.350K

    Stress fracture, pelvis, subsequent encounter for fracture with nonunion

  • M84.350P

    Stress fracture, pelvis, subsequent encounter for fracture with malunion

  • M84.350S

    Stress fracture, pelvis, sequela

  • M84.351

    Stress fracture, right femur

  • M84.351A

    Stress fracture, right femur, initial encounter for fracture

  • M84.351D

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

  • M84.351G

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

  • M84.351K

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

  • M84.351P

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

  • M84.351S

    Stress fracture, right femur, sequela

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