This code specifies whether the beneficiary met the Chronic Conditions Warehouse (CCW) algorithm criteria for Alzheimer's disease as of the end of the calendar year.
The CCW’s chronic condition indicator variables require beneficiaries to satisfy both claims criteria (a minimum number/type of claims that have the proper diagnosis codes and occurred within a specified time period) and coverage criteria (FFS Part A and Part B coverage during the entire specified time period).
For Alzheimer's disease, beneficiaries must have at least one inpatient, skilled nursing facility (SNF), or home health claim, or two Part B (institutional or non-institutional) claims that are at least one day apart, with an Alzheimer's disease code in any position during the two-year reference period.
You can find more detailed information on the algorithm criteria on the CCW website: https://www.ccwdata.org/web/guest/condition-categories-chronic
Source: CCW (derived)
From CY 2017 to CY 2021, the MBSF: Chronic Conditions segment also has a previous (CC27) version. The algorithm used to create the Alzheimer's Disease End-of-Year Indicator variable in the CC27 version includes an increased reference period and a reduced claim requirement.
|0||Beneficiary did not meet claims criteria or have sufficient fee-for-service (FFS) coverage|
|1||Beneficiary met claims criteria but did not have sufficient FFS coverage|
|2||Beneficiary did not meet claims criteria but had sufficient FFS coverage|
|3||Beneficiary met claims criteria and had sufficient FFS coverage|