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
  • M80.849S

    Other osteoporosis with current pathological fracture, unspecified hand, sequela

  • M80.851

    Other osteoporosis with current pathological fracture, right femur

  • M80.851A

    Other osteoporosis with current pathological fracture, right femur, initial encounter for fracture

  • M80.851D

    Other osteoporosis with current pathological fracture, right femur, subsequent encounter for fracture with routine healing

  • M80.851G

    Other osteoporosis with current pathological fracture, right femur, subsequent encounter for fracture with delayed healing

  • M80.851K

    Other osteoporosis with current pathological fracture, right femur, subsequent encounter for fracture with nonunion

  • M80.851P

    Other osteoporosis with current pathological fracture, right femur, subsequent encounter for fracture with malunion

  • M80.851S

    Other osteoporosis with current pathological fracture, right femur, sequela

  • M80.852

    Other osteoporosis with current pathological fracture, left femur

  • M80.852A

    Other osteoporosis with current pathological fracture, left femur, initial encounter for fracture

  • M80.852D

    Other osteoporosis with current pathological fracture, left femur, subsequent encounter for fracture with routine healing

  • M80.852G

    Other osteoporosis with current pathological fracture, left femur, subsequent encounter for fracture with delayed healing

  • M80.852K

    Other osteoporosis with current pathological fracture, left femur, subsequent encounter for fracture with nonunion

  • M80.852P

    Other osteoporosis with current pathological fracture, left femur, subsequent encounter for fracture with malunion

  • M80.852S

    Other osteoporosis with current pathological fracture, left femur, sequela

  • M80.859

    Other osteoporosis with current pathological fracture, unspecified femur

  • M80.859A

    Other osteoporosis with current pathological fracture, unspecified femur, initial encounter for fracture

  • M80.859D

    Other osteoporosis with current pathological fracture, unspecified femur, subsequent encounter for fracture with routine healing

  • M80.859G

    Other osteoporosis with current pathological fracture, unspecified femur, subsequent encounter for fracture with delayed healing

  • M80.859K

    Other osteoporosis with current pathological fracture, unspecified femur, subsequent encounter for fracture with nonunion

  • M80.859P

    Other osteoporosis with current pathological fracture, unspecified femur, subsequent encounter for fracture with malunion

  • M80.859S

    Other osteoporosis with current pathological fracture, unspecified femur, sequela

  • M80.861

    Other osteoporosis with current pathological fracture, right lower leg

  • M80.861A

    Other osteoporosis with current pathological fracture, right lower leg, initial encounter for fracture

  • M80.861D

    Other osteoporosis with current pathological fracture, right lower leg, subsequent encounter for fracture with routine healing

  • M80.861G

    Other osteoporosis with current pathological fracture, right lower leg, subsequent encounter for fracture with delayed healing

  • M80.861K

    Other osteoporosis with current pathological fracture, right lower leg, subsequent encounter for fracture with nonunion

  • M80.861P

    Other osteoporosis with current pathological fracture, right lower leg, subsequent encounter for fracture with malunion

  • M80.861S

    Other osteoporosis with current pathological fracture, right lower leg, sequela

  • M80.862

    Other osteoporosis with current pathological fracture, left lower leg

  • M80.862A

    Other osteoporosis with current pathological fracture, left lower leg, initial encounter for fracture

  • M80.862D

    Other osteoporosis with current pathological fracture, left lower leg, subsequent encounter for fracture with routine healing

  • M80.862G

    Other osteoporosis with current pathological fracture, left lower leg, subsequent encounter for fracture with delayed healing

  • M80.862K

    Other osteoporosis with current pathological fracture, left lower leg, subsequent encounter for fracture with nonunion

  • M80.862P

    Other osteoporosis with current pathological fracture, left lower leg, subsequent encounter for fracture with malunion

  • M80.862S

    Other osteoporosis with current pathological fracture, left lower leg, sequela

  • M80.869

    Other osteoporosis with current pathological fracture, unspecified lower leg

  • M80.869A

    Other osteoporosis with current pathological fracture, unspecified lower leg, initial encounter for fracture

  • M80.869D

    Other osteoporosis with current pathological fracture, unspecified lower leg, subsequent encounter for fracture with routine healing

  • M80.869G

    Other osteoporosis with current pathological fracture, unspecified lower leg, subsequent encounter for fracture with delayed healing

  • M80.869K

    Other osteoporosis with current pathological fracture, unspecified lower leg, subsequent encounter for fracture with nonunion

  • M80.869P

    Other osteoporosis with current pathological fracture, unspecified lower leg, subsequent encounter for fracture with malunion

  • M80.869S

    Other osteoporosis with current pathological fracture, unspecified lower leg, sequela

  • M80.871

    Other osteoporosis with current pathological fracture, right ankle and foot

  • M80.871A

    Other osteoporosis with current pathological fracture, right ankle and foot, initial encounter for fracture

  • M80.871D

    Other osteoporosis with current pathological fracture, right ankle and foot, subsequent encounter for fracture with routine healing

  • M80.871G

    Other osteoporosis with current pathological fracture, right ankle and foot, subsequent encounter for fracture with delayed healing

  • M80.871K

    Other osteoporosis with current pathological fracture, right ankle and foot, subsequent encounter for fracture with nonunion

  • M80.871P

    Other osteoporosis with current pathological fracture, right ankle and foot, subsequent encounter for fracture with malunion

  • M80.871S

    Other osteoporosis with current pathological fracture, right ankle and foot, sequela

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