2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Musculoskeletal System And Connective Tissue 710-739 > Osteopathies, Chondropathies, And Acquired Musculoskeletal Deformities 730-739 > Other Disorders Of Bone And Cartilage 733.* > 2008 ICD-9-CM Diagnosis 733.0 Osteoporosis  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 733.0 can be accessed here. (OSS-tee-oh-pa-ROW-sis) A condition that is characterized by a decrease in bone mass and density, causing bones to become fragile. A condition of reduced bone mass, with decreased cortical thickness and a decrease in the number and size of the trabeculae of cancellous bone (but normal chemical composition), resulting in increased fracture incidence. Osteoporosis is classified as primary (Type 1, postmenopausal osteoporosis; Type 2, age-associated osteoporosis; and idiopathic, which can affect juveniles, premenopausal women, and middle-aged men) and secondary osteoporosis (which results from an identifiable cause of bone mass loss). Reduction of bone mass without alteration in the composition of bone, leading to fractures. Primary osteoporosis can be of two major types: postmenopausal osteoporosis (OSTEOPOROSIS, POSTMENOPAUSAL) and age-related or senile osteoporosis. 733.0 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 733.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Use additional code to identify major osseous defect, if applicable (731.3)