The OASIS, QIES, and Medicare claims data used to develop the statistics displayed on this Web site are routinely updated with a delay of approximately 2-3 months to ensure that the Centers for Medicare & Medicaid Services has virtually all the data from the agencies for a reporting period. The OASIS data used to calculate the quality measures are updated quarterly and represent a rolling 12 months of data. Data for all episodes of care that end within that 12-month period are included regardless of when the episode of care began. Once sufficient time has elapsed after the institution of the OASIS assessment instrument, episodes of care that are greater than 12 months in length are included in the data analysis.
The QIES data used for the agency characteristics can be updated on an “as-needed” basis by the State survey agency with a 2-3 month lag time. Administrative information (like name and address) is updated monthly, although it may take a couple of months for new information to be posted. Newly certified home health agencies may not appear in Home Health Compare for a year. This time lag allows more time for agencies to submit data and increases the number of patient episodes of care that can be reported on for an agency.
Calculations of quality measures based on claims are updated quarterly and represent a rolling 12 months of data. Data for all episodes of care that begin during the 12-month reporting period are included.