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ICD-9 Codes Used to Identify Study Sample
| ICD-9 Code* | Cancer Group |
|---|---|
| 196 | Secondary and unspecified malignant neoplasm of lymph nodes |
| 197 | Secondary malignant neoplasm of respiratory and digestive systems |
| 198 | Secondary malignant neoplasm of other specified sites |
Abbreviation: ICD-9, International Classification of Diseases, 9th Revision.
Includes all subcodes as well.
