How SEER, MHOS, and Medicare Data Are Linked
The linkage of the SEER-MHOS data is a collaborative effort of the National Cancer Institute (NCI), the SEER registries, and the Centers for Medicare and Medicaid Services (CMS). The linkage of persons in the SEER data to their MHOS data is performed by NCI and CMS and is not the responsibility of investigators seeking to use the data.
- The linkage of MHOS and SEER data was accomplished by using an existing file that links persons in the SEER data to the Medicare’s master enrollment file. This existing file was initially constructed for the SEER-Medicare linked database, another collaborative project between CMS and NCI.
- To create the SEER-MHOS linked database, the identifiers from MHOS respondents were matched to identifiers in the existing SEER-Medicare file. The dataset represents the linkage of 18 MHOS cohorts that run from 1998 to 2017. The linkage includes SEER cases diagnosed through 2015 (with vital status through 2017). NCI and CMS plan to continue to update the SEER-MHOS linkage every two years. Sign up here for our SEER-MHOS listerv.
The processes for matching persons appearing in the MHOS data with their SEER data are described in: