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             Congressional Research Service
             informing Ih  legisative d ba e sin e 1914



Medicaid Primer


Updated April 20, 2023


Medicaid is a joint federal-state program that finances the
delivery of primary and acute medical services, as well as
long-term services and supports (LTSS), to a diverse low-
income population, including children, pregnant women,
adults, individuals with disabilities, and people aged 65 and
older. In FY2021, Medicaid covered health care services for
an estimated 85 million individuals at an estimated cost of
$748 billion.

Participation in Medicaid is voluntary for states, though all
states, the District of Columbia, and the territories choose to
participate. The federal government requires states to cover
certain mandatory populations and benefits but allows
states to cover other optional populations and benefits. Due
to this flexibility, there is substantial state variation in
factors such as Medicaid eligibility, covered benefits, and
provider payment rates. In addition, several waiver and
demonstration authorities in statute allow states to operate
their Medicaid programs outside of certain federal rules.

Eiigbi     y
Historically, Medicaid eligibility generally has been limited
to low-income children, pregnant women, parents of
dependent children, the elderly, and individuals with
disabilities. However, the Patient Protection and Affordable
Care Act (ACA;  P.L. 111-148, as amended) included the
ACA  Medicaid  expansion, which expands Medicaid
eligibility to non-elderly adults with income up to 133% of
the federal poverty level (FPL) at state option. Figure 1
shows Medicaid  enrollment for FY1970 through FY2021.

Figure  I. Medicaid Enrollment

   Enrollees, millions
   100

   60
   40

       I         III
      FY71     FY                FY01    FY11     FY21
   Enrollments measured by average monthlyenrolment.
Source: Medicaid and CHIP Payment and Access Commission
(MACPAC), MACStats: Medicaid and CHIP Data Book, Exhibit 10,
December 15, 2022.

Note: Comparable actual Medicaid enrollment data is not available
for FY2013-FY2021. The FY2021 increased enrollment is mainly due
to the continuous coverage requirement for the Family First
Coronavirus Response Act (P.L. I 16-127) federal medical assistance
percentage (FMAP) increase.

To be eligible for Medicaid, individuals must meet both
categorical (e.g., elderly, children, or pregnant women) and


financial (i.e., income and sometimes assets limits) criteria.
Some  eligibility groups are mandatory for states to cover
under their Medicaid programs; others are optional.

Individuals in need of Medicaid-covered LTSS must
demonstrate the need for long-term care by meeting state-
based eligibility criteria for services, and they also may be
subject to a separate set of Medicaid financial eligibility
rules in order to receive LTSS coverage.

All Medicaid applicants must meet federal and state
requirements regarding residency, immigration status, and
documentation of U.S. citizenship.

Benefits
Medicaid coverage includes a variety of primary and acute-
care services as well as LTSS. Not all Medicaid enrollees
have coverage of the same set of services. Different
eligibility classifications determine the covered services.

For traditional Medicaid benefits, states are required to
cover a wide array of mandatory services (e.g., inpatient
hospital, physician, and nursing facility care). States may
cover optional additional services, such as personal care
services, prescription drugs, and physical therapy.

Alternative Benefit Plan (ABP) coverage is generally
required for enrollees in the ACA Medicaid expansion and
optional for other Medicaid enrollees. Under ABPs, states
have more flexibility to define which populations are served
and what specific benefit packages enrollees will receive. In
general, ABPs may  cover fewer benefits than traditional
Medicaid, but there are some requirements that might make
ABPs  more generous than private insurance (e.g.,
nonemergency  transportation).

Servic-Delivery Systems
Medicaid enrollees generally receive benefits via one of
two service-delivery systems: fee-for-service (FFS) or
managed  care. Under FFS, health care providers are paid by
the state Medicaid program for each service provided to a
Medicaid enrollee. Under managed care, Medicaid
enrollees receive services through a managed care
organization under contract with the state. States
traditionally used FFS for Medicaid. However, since the
1990s, the share of Medicaid enrollees covered by managed
care has increased. Almost 84% of Medicaid enrollees are
covered by some form of managed  care as of July 1, 2020,
and most of them (72% of Medicaid enrollees) are covered
with comprehensive risk-based managed care.

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