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
  • M96.5

    Postradiation scoliosis

  • M96.621

    Fracture of humerus following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm

  • M96.622

    Fracture of humerus following insertion of orthopedic implant, joint prosthesis, or bone plate, left arm

  • M96.629

    Fracture of humerus following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

  • M96.631

    Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm

  • M96.632

    Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, left arm

  • M96.639

    Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

  • M96.65

    Fracture of pelvis following insertion of orthopedic implant, joint prosthesis, or bone plate

  • M96.661

    Fracture of femur following insertion of orthopedic implant, joint prosthesis, or bone plate, right leg

  • M96.662

    Fracture of femur following insertion of orthopedic implant, joint prosthesis, or bone plate, left leg

  • M96.669

    Fracture of femur following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified leg

  • M96.671

    Fracture of tibia or fibula following insertion of orthopedic implant, joint prosthesis, or bone plate, right leg

  • M96.672

    Fracture of tibia or fibula following insertion of orthopedic implant, joint prosthesis, or bone plate, left leg

  • M96.679

    Fracture of tibia or fibula following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified leg

  • M96.69

    Fracture of other bone following insertion of orthopedic implant, joint prosthesis, or bone plate

  • M96.810

    Intraoperative hemorrhage and hematoma of a musculoskeletal structure complicating a musculoskeletal system procedure

  • M96.811

    Intraoperative hemorrhage and hematoma of a musculoskeletal structure complicating other procedure

  • M96.820

    Accidental puncture and laceration of a musculoskeletal structure during a musculoskeletal system procedure

  • M96.821

    Accidental puncture and laceration of a musculoskeletal structure during other procedure

  • M96.830

    Postprocedural hemorrhage of a musculoskeletal structure following a musculoskeletal system procedure

  • M96.831

    Postprocedural hemorrhage of a musculoskeletal structure following other procedure

  • M96.840

    Postprocedural hematoma of a musculoskeletal structure following a musculoskeletal system procedure

  • M96.841

    Postprocedural hematoma of a musculoskeletal structure following other procedure

  • M96.842

    Postprocedural seroma of a musculoskeletal structure following a musculoskeletal system procedure

  • M96.843

    Postprocedural seroma of a musculoskeletal structure following other procedure

  • M96.89

    Other intraoperative and postprocedural complications and disorders of the musculoskeletal system

  • M96.A1

    Fracture of sternum associated with chest compression and cardiopulmonary resuscitation

  • M96.A2

    Fracture of one rib associated with chest compression and cardiopulmonary resuscitation

  • M96.A3

    Multiple fractures of ribs associated with chest compression and cardiopulmonary resuscitation

  • M96.A4

    Flail chest associated with chest compression and cardiopulmonary resuscitation

  • M96.A9

    Other fracture associated with chest compression and cardiopulmonary resuscitation

  • M97.01

    Periprosthetic fracture around internal prosthetic right hip joint

  • M97.01XA

    Periprosthetic fracture around internal prosthetic right hip joint, initial encounter

  • M97.01XD

    Periprosthetic fracture around internal prosthetic right hip joint, subsequent encounter

  • M97.01XS

    Periprosthetic fracture around internal prosthetic right hip joint, sequela

  • M97.02

    Periprosthetic fracture around internal prosthetic left hip joint

  • M97.02XA

    Periprosthetic fracture around internal prosthetic left hip joint, initial encounter

  • M97.02XD

    Periprosthetic fracture around internal prosthetic left hip joint, subsequent encounter

  • M97.02XS

    Periprosthetic fracture around internal prosthetic left hip joint, sequela

  • M97.11

    Periprosthetic fracture around internal prosthetic right knee joint

  • M97.11XA

    Periprosthetic fracture around internal prosthetic right knee joint, initial encounter

  • M97.11XD

    Periprosthetic fracture around internal prosthetic right knee joint, subsequent encounter

  • M97.11XS

    Periprosthetic fracture around internal prosthetic right knee joint, sequela

  • M97.12

    Periprosthetic fracture around internal prosthetic left knee joint

  • M97.12XA

    Periprosthetic fracture around internal prosthetic left knee joint, initial encounter

  • M97.12XD

    Periprosthetic fracture around internal prosthetic left knee joint, subsequent encounter

  • M97.12XS

    Periprosthetic fracture around internal prosthetic left knee joint, sequela

  • M97.21

    Periprosthetic fracture around internal prosthetic right ankle joint

  • M97.21XA

    Periprosthetic fracture around internal prosthetic right ankle joint, initial encounter

  • M97.21XD

    Periprosthetic fracture around internal prosthetic right ankle joint, subsequent encounter

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