CMS Pub. 100-16, ch. 4, § 10.2

An MAO offering an MA plan must provide enrollees in that plan with all Part A and Part

B original Medicare services, if the enrollee is entitled to benefits under both parts, and

Part B services if the enrollee is a grandfathered “Part B only” enrollee. The MAO fulfills

its obligation of providing original Medicare benefits by furnishing the benefits directly,

through arrangements, or by paying for the benefits on behalf of enrollees.

Basic benefits must be furnished through providers meeting requirements that are

specified at 42 CFR §422.204(b)(3) and discussed more fully in chapter 6 of this manual,

“Relationships with Providers,” which may be found at:

http://www.cms.gov/Regulations-and-

Guidance/Guidance/Manuals/Downloads/mc86c06.pdf.

Administration of the Medicare program is governed by title XVIII of the Social Security

Act (the Act). Under the Medicare program, the scope of benefits available to eligible

beneficiaries is prescribed by law and divided into several main parts. Part A is the

hospital insurance program and Part B is the voluntary supplementary medical insurance

program.

The scope of the benefits under Part A and Part B is defined in the Act. Part A and Part B

benefits are discussed in sections 1812 and 1832 of the Act, respectively, while section

1861 of the Act lays out the definition of medical and other health services. Specific

health care services must fit into one of these benefit categories, and not be otherwise

excluded from coverage under the Medicare program (see §1862 for exclusions).

In general, the Act lists categories of items and services covered by Medicare, although

Congress occasionally adds specific services to be covered by Medicare. Some categories

are defined more broadly than others; for example, the Act includes hospital outpatient

services furnished incident to physicians’ services (§1861(s)(2)(B)) but also specifically

includes diabetes screening tests (§1861(s)(2)(Y)). The Secretary has the authority to

make determinations about which specific items and services, within categories, may be

covered under the Medicare program. Further interpretation is provided in the Code of

Federal Regulations and CMS guidance.

In general, Medicare coverage and payment is contingent upon a determination that:

• A service is in a covered benefit category;

• A service is not specifically excluded from Medicare coverage by the Act; and

• The item or service is “reasonable and necessary” for the diagnosis or treatment of an

illness or injury, to improve functioning of a malformed body member, or is a

covered preventive service.

These criteria are codified through rulemaking in the Code of Federal Regulations and/or

applied in manual guidance, or are applied through coverage determinations (see section

90 of this chapter). In addition, beneficiaries under part B are entitled to receive an

“annual wellness visit,” certain preventive services for which no cost-sharing may be

charged, and additional preventive services.

Several original Medicare covered benefits and services are covered only for specific

benefit periods, e.g., inpatient hospital services, skilled nursing facility services, and

inpatient psychiatric hospital services. While an MA plan may offer additional coverage

as a supplemental benefit, it may not limit the original Medicare coverage.

MA plans must provide their enrollees with all basic benefits covered under original

Medicare. Consequently, plans may not impose limitations, waiting periods or exclusions

from coverage due to pre-existing conditions that are not present in original Medicare.

The following requirements apply with respect to the rule that MAOs must cover the

costs of original Medicare benefits:

• Benefits: MA plans must provide or pay for medically necessary Part A (for those

entitled) and Part B covered items and services.

• Access: MA enrollees must have access to all medically necessary Part A and Part B

services. However, MA plans are not required to provide MA enrollees the same

access to providers that is provided under original Medicare (see accessibility rules

for MA plans under section 110 of this chapter).

• Cost-Sharing: With the exception of the services listed at 42 CFR 422.100(j) and

certain preventive services graded A or B by the United States Preventive Services

Task Force and covered by original Medicare without cost-sharing (co-insurance),

MA plans may impose cost-sharing for a particular item or service that is above or

below the original Medicare cost-sharing for that service, provided the overall cost-sharing under the plan is actuarially equivalent to that under original Medicare and

the plan cost-sharing structure does not discriminate against sicker beneficiaries, as

discussed in sections 10.5.2 and 10.5.3 of this chapter. MA plans may require

enrollees to pay higher cost-sharing amounts for services furnished out-of-network.

• Billing and Payment: MA plans need not follow original Medicare claims processing

procedures. MA plans may create their own billing and payment procedures as long

as providers – whether contracted or not – are paid accurately, timely and with an

audit trail. MA plans may not require enrollees to pay providers – whether contracted

or not – for original Medicare services and then be reimbursed by the plan. See

section 110.1.3 of this chapter for rules governing payment to non-contracted

providers for original Medicare non-emergent services.