The Acute Hospital Care at Home (AHCAH) initiative, launched in November 2020 in response to the COVID-19 pandemic, allows Medicare-certified hospitals to treat patients with inpatient-level care at home. Data contained within the AHCAH data set was collected by CMS directly from individual hospitals on either a weekly or monthly basis depending on their participation tier, which is based on the level of experience the facility has with providing hospital at-home services.

The Medicaid and CHIP TAF (T-MSIS Analytic File) Demographic and Eligibility (DE) file contains one record for every individual eligible for and enrolled in Medicaid or CHIP for at least one day during the file calendar year.

The Medicaid and CHIP TAF (T-MSIS Analytic File) Inpatient (IP) file contains records for enrollees who had an inpatient hospital stay. Records include fee-for-service (FFS) claims, managed care encounters and supplemental payments for Medicaid, Medicaid-expansion CHIP and separate CHIP.

The Medicaid and CHIP TAF (T-MSIS Analytic File) Other Services (OT) file contains records for a variety of Medicaid services, including physician services, outpatient hospital institutional utilization, lab/X-ray, clinic services, home health, hospice and premium payments. Records include fee-for-service (FFS) claims, managed care encounters and supplemental payments for Medicaid, Medicaid-expansion CHIP and separate CHIP.

The Medicaid and CHIP TAF (T-MSIS Analytic File) Long Term Care (LT) file contains records for institutional long term care provided by specific facilities identified by the Type of Service variable:

• Nursing Facility Services
• Mental Facility Services
• Independent (free-standing) Psychiatric Wings of Acute Care Hospitals
• Intermediate Care Facility (ICF) Services for Individuals With Intellectual Disabilities

The records in the LT TAF include fee-for-service (FFS) claims, managed care encounters and supplemental payments for Medicaid, Medicaid-expansion CHIP, and separate CHIP.

The Medicaid and CHIP TAF (T-MSIS Analytic File) Pharmacy (RX) file includes records of filled prescriptions. Records include fee-for-service (FFS) claims, managed care encounters and supplemental payments for Medicaid, Medicaid-expansion CHIP and separate CHIP.

The TAF APL file contains information about managed care organizations serving Medicaid enrollees. By linking the information in the APL to other TAFs, users can enhance their analyses focused on plans and providers. For example, users can describe their results by plan name. Users can also identify whether the plan serves Medicaid, CHIP, or both; whether the plan operates under a waiver or state plan authority; how the plan reimburses its providers; and whether the plan is for profit.

The TAF APR file contains information about providers of Medicaid services—both facilities and individual providers. By linking the information in the APR to other TAFs by provider ID, users can enhance their analyses focused of providers. For example, users can identify whether the provider is a facility, group or individual; whether the provider’s specialty is primary care, obstetrics, or something else; how the provider is affiliated with other providers in a group practice; where the provider is located; and many other characteristics.

Medicaid MAX (Medicaid Analytic Extract) Personal Summary (PS) file contains one record for every individual eligible for and enrolled in Medicaid for at least one month or who had a Medicaid-paid service within the file year.

The Medicaid MAX (Medicaid Analytic Extract) Inpatient (IP) file contains complete stay records for enrollees who had an inpatient hospital stay. Records include fee-for-service (FFS) claims and encounter records submitted for stays covered by Medicaid managed care.

Medicaid MAX (Medicaid Analytic Extract) Other Services (OT) file contains claim records for a variety of Medicaid services, including physician services, outpatient hospital institutional utilization, lab/X-ray, clinic services, home health, hospice and premium payments.

Medicaid MAX (Medicaid Analytic Extract) Long Term (LT) Care file contains claim records for institutional long term care provided at four specific facility identified by the MAX Type of Service:

• Nursing Facility Services
• Mental Hospital Services for the Aged
• Inpatient Psychiatric Facility Services for Individuals Under the Age Of 21
• Intermediate Care Facility (ICF) Services for Individuals With Intellectual Disabilities

Medicaid MAX (Medicaid Analytic Extract) Prescription Drug (RX) file includes records of filled prescriptions from fee-for-service (FFS) claims paid by Medicaid and encounter records for prescription drugs paid by a Medicaid managed care organization.

The Conditions segment of the MESF flags each Medicaid beneficiary for the presence of one of 27 specific chronic conditions or one of 35 other chronic or potentially disabling conditions.

The National Death Index segment of the MESF includes cause of death information from death certificates provided through linkage with the National Death Index (NDI) cause of death information.

The Long Term Care Minimum Data Set (MDS) is a health status screening and assessment tool used for all residents of long term care nursing facilities certified to participate in Medicare or Medicaid, regardless of payer. The assessment is also required for Medicare payment of skilled nursing facility stays. Assessment data for Skilled Nursing Swing Beds 3.0 is included in a separate file, MDS version 3.0 was implemented on October 1, 2010, replacing version 2.0.

The Home Health Outcome and Assessment Information Set (OASIS) contains data items developed to measure patient outcomes and for improve home health care. The OASIS assessments are required of all home health agencies certified to accept Medicare and Medicaid payments.

The Long Term Care Minimum Data Set (MDS)-Swing Bed is a health status screening and assessment tool. It is required for Medicare payment of hospital-based skilled nursing care. Swing-bed providers are hospitals that can use their beds, as needed, to provide either acute or post-acute skilled nursing care.  The swing-bed assessment includes a subset of the skilled nursing facility (SNF) assessment items. The MDS 3.0 was implemented in October, 2010, replacing version 2.0.

The Long Term Care Minimum Data Set (MDS) is a health status screening and assessment tool used for all residents of long term care nursing facilities certified to participate in Medicare or Medicaid, regardless of payer. The assessment is also required for Medicare payment of skilled nursing facility stays. Assessment data for Skilled Nursing Swing Beds 2.0 is included in a separate file. Version 2.0 was replaced by MDS version 3.0 on October 1, 2010.

The Long Term Care Minimum Data Set (MDS)-Swing Bed is a health status screening and assessment tool. It is required for Medicare payment of hospital-based skilled nursing care. Swing-bed providers are hospitals that can use beds, as needed, to provide either acute or post-acute skilled nursing care.  The swing-bed assessment includes a subset of the skilled nursing facility (SNF) MDS items. MDS Swing Bed 2.0 was replaced by version 3.0 in October, 2010.

The Medicare-Medicaid Linked Enrollee Analytic Data Source (MMLEADS) 2.0 suite of files combines Medicare and Medicaid enrollment and claims data into four annual beneficiary-level files. The files include beneficiaries who are Medicare-only, Medicare-Medicaid dually enrolled and Medicaid-only blind and disabled.

The Medicare-Medicaid Linked Enrollee Analytic Data Source (MMLEADS) 3.0 suite of files combines Medicare and Medicaid enrollment and claims data into two annual beneficiary-level files. The files include beneficiaries who are Medicare-only, Medicare-Medicaid dually enrolled and Medicaid-only blind and disabled.