M00-M99

Diseases of the musculoskeletal system and connective tissue

Chapter coding notes

Excludes 2

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)

Note

(M00-M25) Arthropathies (M00-M25) Includes: Disorders affecting predominantly peripheral (limb) joints (M40-M54) Dorsopathies (M40-M54) (M60-M79) Soft tissue disorders (M60-M79) (M80-M94) Osteopathies and chondropathies (M80-M94)

Blocks in this chapter

M00-M02

Infectious arthropathies

M04

Autoinflammatory syndromes

M05-M14

Inflammatory polyarthropathies

M15-M19

Osteoarthritis

M20-M25

Other joint disorders

M26-M27

Dentofacial anomalies [including malocclusion] and other disorders of jaw

M30-M36

Systemic connective tissue disorders

M40-M43

Deforming dorsopathies

M45-M49

Spondylopathies

M50-M54

Other dorsopathies

M60-M63

Disorders of muscles

M65-M67

Disorders of synovium and tendon

M70-M79

Other soft tissue disorders

M80-M85

Disorders of bone density and structure

M86-M90

Other osteopathies

M91-M94

Chondropathies

M95

Other disorders of the musculoskeletal system and connective tissue

M96

Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified

M97

Periprosthetic fracture around internal prosthetic joint

M99

Biomechanical lesions, not elsewhere classified

Official Guidelines for Chapter 13

FY 2026 ›
I.C.13Chapter-specific guidanceChapter 13: Diseases of the Musculoskeletal System and Connective

Subsections

Sections that reference codes in Chapter 13