Chapter 13
Diseases of the musculoskeletal system and connective tissue
M00–M99
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FY 2027 effective October 1, 2026 · 79 categories in this chapter
Blocks in This Chapter
ICD-10-CM groups this chapter's categories into 20 blocks of three-character categories.
- 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
Categories
Infectious arthropathies (M00-M02)
Autoinflammatory syndromes (M04)
Inflammatory polyarthropathies (M05-M14)
- M05 Rheumatoid arthritis with rheumatoid factor Has subcategories
- M06 Other rheumatoid arthritis Has subcategories
- M07 Enteropathic arthropathies Has subcategories
- M08 Juvenile arthritis Has subcategories
- M1A Chronic gout Has subcategories
- M10 Gout Has subcategories
- M11 Other crystal arthropathies Has subcategories
- M12 Other and unspecified arthropathy Has subcategories
- M13 Other arthritis Has subcategories
- M14 Arthropathies in other diseases classified elsewhere Has subcategories
Osteoarthritis (M15-M19)
Other joint disorders (M20-M25)
- M20 Acquired deformities of fingers and toes Has subcategories
- M21 Other acquired deformities of limbs Has subcategories
- M22 Disorder of patella Has subcategories
- M23 Internal derangement of knee Has subcategories
- M24 Other specific joint derangements Has subcategories
- M25 Other joint disorder, not elsewhere classified Has subcategories
Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27)
Systemic connective tissue disorders (M30-M36)
- M30 Polyarteritis nodosa and related conditions Has subcategories
- M31 Other necrotizing vasculopathies Has subcategories
- M32 Systemic lupus erythematosus (SLE) Has subcategories
- M33 Dermatopolymyositis Has subcategories
- M34 Systemic sclerosis [scleroderma] Has subcategories
- M35 Other systemic involvement of connective tissue Has subcategories
- M36 Systemic disorders of connective tissue in diseases classified elsewhere Has subcategories
Deforming dorsopathies (M40-M43)
Spondylopathies (M45-M49)
Other dorsopathies (M50-M54)
Disorders of muscles (M60-M63)
Disorders of synovium and tendon (M65-M67)
Other soft tissue disorders (M70-M79)
- M70 Soft tissue disorders related to use, overuse and pressure Has subcategories
- M71 Other bursopathies Has subcategories
- M72 Fibroblastic disorders Has subcategories
- M75 Shoulder lesions Has subcategories
- M76 Enthesopathies, lower limb, excluding foot Has subcategories
- M77 Other enthesopathies Has subcategories
- M79 Other and unspecified soft tissue disorders, not elsewhere classified Has subcategories
Disorders of bone density and structure (M80-M85)
- M80 Osteoporosis with current pathological fracture Has subcategories
- M81 Osteoporosis without current pathological fracture Has subcategories
- M83 Adult osteomalacia Has subcategories
- M84 Disorder of continuity of bone Has subcategories
- M85 Other disorders of bone density and structure Has subcategories