Table 2. Histology Categories and ICD-O-3,^* Codes Used to Define Malignant Primary Osteosarcomas^† United States, 1999-2008.

Histology Definitions for Primary Malignant Osteosarcomas	ICD-O-3 Codes
Osteosarcoma, NOS‡	9180/3
Chondroblastic osteosarcoma	9181/3
Fibroblastic osteosarcoma	9182/3
Telangiectatic osteosarcoma	9183/3
Osteosarcoma in Paget disease	9184/3
Small cell osteosarcoma	9185/3
Central osteosarcoma	9186/3
Intraosseous well differentiated osteosarcoma	9187/3
Paraosteal osteosarcoma	9192/3
Periosteal osteosarcoma	9193/3
High grade surface osteosarcoma	9194/3
Intracortical osteosarcoma	9195/3
Malignant osteosarcoma	9200/3

^*ICD-O-3 indicates International Classification of Diseases for Oncology-3rd Edition

^†The analyses were limited to microscopically confirmed osteosarcomas.

^‡NOS, not otherwise specified.