Chapter XIII
Diseases of the musculoskeletal system and connective tissue
(M00-M99)

Osteopathies and chondropathies
(M80-M94)

Disorders of bone density and structure
(M80-M85)

M80 Osteoporosis with pathological fracture
[See site code at the beginning of this chapter ]
Includes: osteoporotic vertebral collapse and wedging
Excludes: collapsed vertebra NOS ( M48.5 )
pathological fracture NOS ( M84.4 )
wedging of vertebra NOS ( M48.5 )
M80.0 Postmenopausal osteoporosis with pathological fracture
M80.1 Postoophorectomy osteoporosis with pathological fracture
M80.2 Osteoporosis of disuse with pathological fracture
M80.3 Postsurgical malabsorption osteoporosis with pathological fracture
M80.4 Drug-induced osteoporosis with pathological fracture
Use additional external cause code (Chapter XX), if desired, to identify drug.
M80.5 Idiopathic osteoporosis with pathological fracture
M80.8 Other osteoporosis with pathological fracture
M80.9 Unspecified osteoporosis with pathological fracture

M81 Osteoporosis without pathological fracture
[See site code at the beginning of this chapter ]
Excludes: osteoporosis with pathological fracture ( M80.- )
M81.0 Postmenopausal osteoporosis
M81.1 Postoophorectomy osteoporosis
M81.2 Osteoporosis of disuse
Excludes: Sudeck's atrophy ( M89.0 )
M81.3 Postsurgical malabsorption osteoporosis
M81.4 Drug-induced osteoporosis
Use additional external cause code (Chapter XX), if desired, to identify drug.
M81.5 Idiopathic osteoporosis
M81.6 Localized osteoporosis [Lequesne]
Excludes: Sudeck's atrophy ( M89.0 )
M81.8 Other osteoporosis
Senile osteoporosis
M81.9 Osteoporosis, unspecified

M82* Osteoporosis in diseases classified elsewhere
[See site code at the beginning of this chapter ]
M82.0* Osteoporosis in multiple myelomatosis ( C90.0+ )
M82.1* Osteoporosis in endocrine disorders ( E00-E34+ )
M82.8* Osteoporosis in other diseases classified elsewhere

M83 Adult osteomalacia
[See site code at the beginning of this chapter ]
Excludes: osteomalacia:
· infantile and juvenile ( E55.0 )
· vitamin-D-resistant ( E83.3 )
renal osteodystrophy ( N25.0 )
rickets (active) ( E55.0 )
· sequelae ( E64.3 )
· vitamin-D-resistant ( E83.3 )
M83.0 Puerperal osteomalacia
M83.1 Senile osteomalacia
M83.2 Adult osteomalacia due to malabsorption
Postsurgical malabsorption osteomalacia in adults
M83.3 Adult osteomalacia due to malnutrition
M83.4 Aluminium bone disease
M83.5 Other drug-induced osteomalacia in adults
Use additional external cause code (Chapter XX), if desired, to identify drug.
M83.8 Other adult osteomalacia
M83.9 Adult osteomalacia, unspecified

M84 Disorders of continuity of bone
[See site code at the beginning of this chapter ]
M84.0 Malunion of fracture
M84.1 Nonunion of fracture [pseudarthrosis]
Excludes: pseudarthrosis after fusion or arthrodesis ( M96.0 )
M84.2 Delayed union of fracture
M84.3 Stress fracture, not elsewhere classified
Stress fracture NOS
Excludes: stress fracture of vertebra ( M48.4 )
M84.4 Pathological fracture, not elsewhere classified
Pathological fracture NOS
Excludes: collapsed vertebra NEC ( M48.5 )
pathological fracture in osteoporosis ( M80.- )
M84.8 Other disorders of continuity of bone
M84.9 Disorder of continuity of bone, unspecified

M85 Other disorders of bone density and structure
[See site code at the beginning of this chapter ]
Excludes: osteogenesis imperfecta ( Q78.0 )
osteopetrosis ( Q78.2 )
osteopoikilosis ( Q78.8 )
polyostotic fibrous dysplasia ( Q78.1 )
M85.0 Fibrous dysplasia (monostotic)
Excludes: fibrous dysplasia of jaw ( K10.8 )
M85.1 Skeletal fluorosis
M85.2 Hyperostosis of skull
M85.3 Osteitis condensans
M85.4 Solitary bone cyst
Excludes: solitary cyst of jaw ( K09.1-K09.2 )
M85.5 Aneurysmal bone cyst
Excludes: aneurysmal cyst of jaw ( K09.2 )
M85.6 Other cyst of bone
Excludes: cyst of jaw NEC ( K09.1-K09.2 )
osteitis fibrosa cystica generalisata [von Recklinghausen's disease of bone] ( E21.0 )
M85.8 Other specified disorders of bone density and structure
Hyperostosis of bones, except skull
Osteosclerosis, acquired
Excludes: diffuse idiopathic skeletal hyperostosis [DISH] ( M48.1 )
osteosclerosis:
· congenita ( Q77.4 )
· myelofibrosis ( D75.8 )
M85.9 Disorder of bone density and structure, unspecified