42 C.F.R. § 423.100
As used in this part, unless otherwise specified—
ACIP-recommended adult vaccine means a covered Part D drug, as defined in this section, that is a vaccine licensed by the U.S. Food and Drug Administration (FDA) under section 351 of the Public Health Service Act for use by adult populations and administered in accordance with recommendations of the Advisory Committee on Immunization Practices (ACIP) of the Centers for Disease Control and Prevention (CDC) as adopted by the CDC Director.
Actual cost means the negotiated price for a covered Part D drug when the drug is purchased at a network pharmacy, and the usual and customary price when a beneficiary purchases the drug at an out-of-network pharmacy consistent with § 423.124(a).
Affected enrollee, as used in this subpart, means a Part D enrollee who is currently taking a covered Part D drug that is subject to a negative formulary change that affects the Part D enrollee's access to the drug during the current plan year.
Alternative prescription drug coverage means coverage of Part D drugs, other than standard prescription drug coverage that meets the requirements of § 423.104(e). The term alternative prescription drug coverage must be either—
Applicable beneficiary means an individual who, on the date of dispensing a covered Part D drug—
(3)
(i) For the purposes of the Coverage Gap Discount Program—
(D) Has a claim that—
(1) Is within the coverage gap;
(2) Straddles the initial coverage period and the coverage gap;
(3) Straddles the coverage gap and the annual out-of-pocket threshold; or
(4) Spans the coverage gap from the initial coverage period and exceeds the annual out-of-pocket threshold; and
(ii) For the purposes of the Manufacturer Discount Program, has incurred costs, as determined in accordance with section 1860D-2(b)(4)(C) of the Act, for covered Part D drugs in the year that exceed the annual deductible specified in section 1860D-2(b)(1) of the Act.
Applicable discount, for purposes of the—
Applicable drug means a Part D drug that is—
(1)
(2)
Applicable number of calendar days means, with respect to claims for reimbursement submitted electronically, 14 days, and otherwise, 30 days.
At-risk beneficiary means a Part D eligible individual—
(1) Who is—
Basic prescription drug coverage means coverage of Part D drugs that is either standard prescription drug coverage or basic alternative coverage.
Bioequivalent has the meaning given such term in section 505(j)(8) of the Food, Drug, and Cosmetic Act.
Clinical guidelines, for the purposes of a drug management program under § 423.153(f), are criteria—
Contracted pharmacy network means licensed pharmacies, including retail, mail-order, and institutional pharmacies under contract with a Part D sponsor to provide covered Part D drugs at negotiated prices to Part D enrollees.
Corresponding drug means, respectively, a generic or authorized generic of a brand name drug, an interchangeable biological product of a reference product, or an unbranded biological product marketed under the same biologics license application (BLA) as a brand name biological product.
Coverage gap means the period in prescription drug coverage that occurs between the initial coverage limit and the out-of-pocket threshold during the years 2006 through 2024. For purposes of applying the initial coverage limit, Part D sponsors must apply their plan specific initial coverage limit under basic alternative, enhanced alternative or actuarially equivalent Part D benefit designs.
Covered insulin product means, for purposes of § 423.120(h), an insulin product, including a product that is a combination of more than one type of insulin or a product that is a combination of both insulin and a non-insulin drug or biological product, that—
(1) Is a covered Part D drug covered under a PDP or MA-PD plan—
Covered insulin product applicable cost-sharing amount means, with respect to a covered insulin product, as defined in this section, covered under a PDP or an MA-PD plan prior to an enrollee reaching the annual out-of-pocket threshold during plan year 2026 and each subsequent plan year, the lesser of the following:
(3) An amount equal to 25 percent of the negotiated price (as defined in this section) of the covered insulin product under the PDP or MA-PD plan.
Covered Part D drug means a Part D drug that is included in a Part D plan's formulary, or treated as being included in a Part D plan's formulary as a result of a coverage determination or appeal under §§ 423.566, 423.580, and 423.600, 423.610, 423,620, and 423.630, and obtained at a network pharmacy or an out-of-network pharmacy in accordance with § 423.124.
Daily cost-sharing rate means, as applicable, the established—
Date of dispensing means the date of service. For long-term care and home infusion pharmacies, the date of dispensing can be interpreted as the date the pharmacy submits the discounted claim for reimbursement.
Dispensing fees means costs that-
Effective date of the ACIP recommendation means the date specified on the CDC website noting the date the CDC Director adopted the ACIP recommendation.
Exempted beneficiary means with respect to a drug management program, an enrollee who—
Frequently abused drug means a controlled substance under the Federal Controlled Substances Act that the Secretary determines is frequently abused or diverted, taking into account all of the following factors:
Government-funded health program means any program established, maintained, or funded, in whole or in part, by the Government of the United States, by the government of any State or political subdivision of a State, or by any agency or instrumentality of any of the foregoing, which uses public funds, in whole or in part, to provide to, or pay on behalf of, an individual the cost of Part D drugs, including any of the following:
(5) Any other government-funded program whose principal activity is the direct provision of health care to persons.
Group health plan, for purposes of applying the definition of incurred costs in § 423.100, has the meaning given such term in 29 U.S.C. 1167(1), but specifically excludes a personal health savings vehicle, as used in this subpart.
Immediate negative formulary change means an immediate substitution or market withdrawal that meets the requirements of § 423.120(e)(2)(i) or (ii) respectively.
Incurred costs means costs incurred by a Part D enrollee—
(1) For—
(2) That are paid for—
Insurance means a health plan that provides, or pays the cost of Part D drugs, including, but not limited to, any of the following:
I/T/U pharmacy means a pharmacy operated by the Indian Health Service, an Indian tribe or tribal organization, or an urban Indian organization, all of which are defined in section 4 of the Indian Health Care Improvement Act, 25 U.S.C. 1603.
Labeler code means the first segment of the National Drug Code (NDC) that identifies a particular manufacturer.
Long-term care facility means a skilled nursing facility as defined in section 1819(a) of the Act, or a medical institution or nursing facility for which payment is made for an institutionalized individual under section 1902(q)(1)(B) of the Act.
Long-term care pharmacy means a pharmacy owned by or under contract with a long-term care facility to provide prescription drugs to the facility's residents.
Long-term care network pharmacy means a long-term care pharmacy that is a network pharmacy.
Maintenance change means one of the following negative formulary changes with respect to a covered Part D drug:
Manufacturer means any entity which is engaged in the production, preparation, propagation, compounding, conversion or processing of prescription drug products, either directly or indirectly, by extraction from substances of natural origin, or independently by means of chemical synthesis, or by a combination of extraction and chemical synthesis. For purposes of the Coverage Gap Discount Program and the Manufacturer Discount Program, such term does not include a wholesale distributor of drugs or a retail pharmacy licensed under State law, but includes entities otherwise engaged in repackaging or changing the container, wrapper, or labeling of any applicable drug product in furtherance of the distribution of the applicable drug from the original place of manufacture to the person who makes the final delivery or sale to the ultimate consumer or user.
Manufacturer Discount Program means the Medicare Part D Manufacturer Discount Program established under section 1860D-14C of the Act.
Manufacturer Discount Program agreement means the agreement described at section 1860D-14C(b) of the Act.
Medicare Coverage Gap Discount Program (or Coverage Gap Discount Program) means the Medicare Coverage Gap Discount Program established under section 1860D-14A of the Act.
Medicare Coverage Gap Discount Program agreement (or Coverage Gap Discount Program agreement) means the agreement described in section 1860D-14A(b) of the Act.
National Drug Code (NDC) means the unique identifying prescription drug product number that is listed with the Food and Drug Administration (FDA) identifying the product's manufacturer, product and package size and type.
Negative formulary change means one of the following changes with respect to a covered Part D drug:
Negotiated price means the price for a covered Part D drug that—
(2) Meets all of the following:
Network pharmacy means a licensed pharmacy that is under contract with a Part D sponsor to provide covered Part D drugs at negotiated prices to its Part D plan enrollees.
Non-applicable drug means any Part D drug that is not an applicable drug and not a selected drug during a price applicability period with respect to such drug.
Non-maintenance change means a negative formulary change that is not a maintenance change or an immediate negative formulary change.
Non-preferred pharmacy means a network pharmacy that offers covered Part D drugs at negotiated prices to Part D enrollees at higher cost-sharing levels than apply at a preferred pharmacy.
Or otherwise means through a government-funded health program.
Other specified entities means State Pharmaceutical Assistance Programs (as defined in § 423.454), entities providing other prescription drug coverage (as described in § 423.464(f)(1)), authorized prescribers, network pharmacies, and pharmacists.
Out-of-network pharmacy means a licensed pharmacy that is not under contract with a Part D sponsor to provide negotiated prices to Part D plan enrollees.
Part D drug means—
(1) Unless excluded under paragraph (2) of this definition, any of the following if used for a medically accepted indication (as defined in section 1860D-2(e)(4) of the Act)—
(2) Does not include any of the following:
Person means a natural person, corporation, mutual company, unincorporated association, partnership, joint venture, limited liability company, trust, estate, foundation, not-for-profit corporation, unincorporated organization, government or governmental subdivision or agency.
Personal health savings vehicle means a vehicle through which individuals can set aside their own funds to pay for health care expenses, including covered Part D drugs, on a tax-free basis including any of the following—
Plan allowance means the amount Part D plans that offer coverage other than defined standard coverage may use to determine their payment and Part D enrollees' cost-sharing for covered Part D drugs purchased at an out-of-network pharmacy or in a physician's office in accordance with the requirements of § 423.124(b).
Potential at-risk beneficiary means a Part D eligible individual who is not an exempted beneficiary (as defined in this section) and—
Preclusion list means a CMS compiled list of prescribers who—
(1) Meet all of the following requirements:
(iii) CMS determines that the underlying conduct that led to the revocation is detrimental to the best interests of the Medicare program. In making this determination under this paragraph (1)(iii), CMS considers the following factors:
(2) Meet both of the following requirements:
(ii) CMS determines that the underlying conduct that would have led to the revocation is detrimental to the best interests of the Medicare program. In making this determination under this paragraph, CMS considers all of the following factors:
(3) The prescriber, regardless of whether he or she is or was enrolled in Medicare, has been convicted of a felony under Federal or State law within the previous 10 years that CMS deems detrimental to the best interests of the Medicare program. Factors that CMS considers in making such a determination under this paragraph are as follows:
Preferred drug means a covered Part D drug on a Part D plan's formulary for which beneficiary cost-sharing is lower than for a non-preferred drug in the plan's formulary.
Preferred pharmacy means a network pharmacy that offers covered Part D drugs at negotiated prices to Part D enrollees at lower levels of cost-sharing than apply at a non-preferred pharmacy under its pharmacy network contract with a Part D plan.
Price applicability period has the meaning given such term in section 1191(b)(2) of the Act and any applicable regulations and guidance.
Price concession means any form of discount, direct or indirect subsidy, or rebate received by the Part D sponsor or its intermediary contracting organization from any source that serves to decrease the costs incurred under the Part D plan by the Part D sponsor. Examples of price concessions include but are not limited to: Discounts, chargebacks, rebates, cash discounts, free goods contingent on a purchase agreement, coupons, free or reduced-price services, and goods in kind.
Program size means the estimated population of potential at-risk beneficiaries in drug management programs (described in § 423.153(f)) operated by Part D plan sponsors that the Secretary determines can be effectively managed by such sponsors as part of the process to develop clinical guidelines.
Qualified prescription drug coverage means any standard prescription drug coverage or alternative prescription drug coverage
Required prescription drug coverage means coverage of Part D drugs under an MA-PD plan that consists of either—
Retail pharmacy means any licensed pharmacy that is open to dispense prescription drugs to the walk-in general public from which Part D enrollees could purchase a covered Part D drug without being required to receive medical services from a provider or institution affiliated with that pharmacy.
Rural means a five-digit ZIP code in which the population density is less than 1,000 individuals per square mile.
Selected drug has the meaning given such term in section 1192(c) of the Act and any applicable regulations and guidance.
Standard prescription drug coverage means coverage of Part D drugs that meets the requirements of § 423.104(d). The term standard prescription drug coverage must be either—
Suburban means a five-digit ZIP code in which the population density is between 1,000 and 3,000 individuals per square mile.
Supplemental benefits means benefits offered by Part D plans, other than employer group health or waiver plans, that meet the requirements of § 423.104(f)(1)(ii).
Therapeutically equivalent refers to drugs that are rated as therapeutic equivalents under the Food and Drug Administration's most recent publication of “Approved Drug Products with Therapeutic Equivalence Evaluations.”
Third Party Administrator (TPA) means the CMS contractor responsible for administering the requirements established by CMS to carry out sections 1860D-14A and 1860D-14C of the Act.
Third party payment arrangement means any contractual or similar arrangement under which a person has a legal obligation to pay for covered Part D drugs.
Urban means a five-digit ZIP code in which the population density is greater than 3,000 individuals per square mile.
Usual and customary (U&C) price means the price that an out-of-network pharmacy or a physician's office charges a customer who does not have any form of prescription drug coverage for a covered Part D drug.
Valid prescription means a prescription that complies with all applicable State law requirements constituting a valid prescription.
[70 FR 4525, Jan. 28, 2005, as amended at 73 FR 20506, Apr. 15, 2008; 74 FR 1543, Jan. 12, 2009; 76 FR 21571, Apr. 15, 2011; 77 FR 22169, Apr. 12, 2012; 77 FR 32407, June 1, 2012; 79 FR 29962, May 23, 2014; 80 FR 7963, Feb. 12, 2015; 80 FR 25966, May 6, 2015; 83 FR 16737, Apr. 16, 2018; 84 FR 15840, Apr. 16, 2019; 86 FR 6115, Jan. 19, 2021; 87 FR 27899, May 9, 2022; 89 FR 30832, Apr. 23, 2024; 89 FR 63828, Aug. 6, 2024; 90 FR 15911, Apr. 15, 2025; 91 FR 17584, Apr. 6, 2026]