Preventive Care Services Covered Under US Health Plans

Federal law requires most US health insurance plans to cover a defined set of preventive care services without cost-sharing — meaning no copay, deductible, or coinsurance at the time of service when accessed through in-network providers. This page covers the regulatory framework governing these requirements, the categories of services included, how coverage is triggered, and the boundaries between services that qualify and those that do not. Understanding these rules is relevant to patients navigating health insurance coverage types as well as to those reviewing their explanation of benefits (EOB) after a visit.

Definition and scope

Preventive care services, as defined under federal health policy, are clinical interventions delivered to asymptomatic individuals — or those without a confirmed diagnosis of the condition being screened — that aim to detect disease early, prevent disease onset, or reduce disease burden at a population level. The operative legal authority is Section 2713 of the Public Health Service Act, as amended by the Affordable Care Act (ACA) of 2010, which mandates that non-grandfathered health plans cover preventive services without imposing cost-sharing on the patient (42 U.S.C. § 300gg-13).

Four distinct evidence bodies establish which specific services qualify for mandatory no-cost coverage:

1. USPSTF Grade A or B recommendations — Services recommended by the US Preventive Services Task Force with a Grade A (high certainty of substantial benefit) or Grade B (high certainty of moderate benefit, or moderate certainty of moderate-to-substantial benefit) rating.
2. ACIP immunization recommendations — Vaccines recommended by the Advisory Committee on Immunization Practices (ACIP), as adopted by the CDC Director.
3. HRSA women's preventive services guidelines — Additional screenings and services specified by the Health Resources and Services Administration (HRSA) for women.
4. HRSA Bright Futures guidelines — Preventive care and screenings for infants, children, and adolescents as recommended through the Bright Futures program, administered by HRSA in partnership with the American Academy of Pediatrics.

Grandfathered health plans — defined under ACA regulations as plans that were in existence on March 23, 2010 and have not undergone substantial changes — are exempt from this mandate (45 CFR § 147.140). The Centers for Medicare & Medicaid Services (CMS) estimates that a substantial majority of Americans are enrolled in non-grandfathered plans subject to the requirement.

How it works

Coverage of a qualifying preventive service at $0 cost-sharing is conditional on three factors: the service must appear on a qualifying evidence list with the appropriate grade, the provider must be in-network, and the visit must be characterized as preventive rather than diagnostic.

The mechanism operates as follows:

1. Recommendation review cycle: The USPSTF updates its recommendations on a rolling basis. A service newly elevated to Grade A or B becomes a mandatory covered benefit for plan years beginning on or after one year after the recommendation date (ACA Section 2713(b)(1)).
2. Plan coverage obligation: The insurer or plan administrator must cover the recommended service with no cost-sharing imposed at the point of care when delivered by an in-network provider.
3. Billing and coding: Providers submit claims using preventive visit codes (typically CPT codes in the 99381–99397 range for routine preventive medicine services, or specific screening codes). The medical billing and coding framework determines how the claim is classified and processed.
4. Out-of-network exception: If no in-network provider is reasonably available to furnish the preventive service, plans must provide the service out-of-network without cost-sharing under CMS guidance — though this exception is narrowly defined.
5. Separate cost-sharing for additional services: If a preventive visit includes evaluation and management of a new or existing condition, the plan may apply cost-sharing to the non-preventive component. This is a common source of unexpected patient charges.

For Medicare beneficiaries, the parallel framework is found in the Medicare Preventive Services provisions under Parts B and C. Coverage details for the Medicare population are addressed under Medicare Parts A, B, C, D explained. Medicaid preventive coverage is governed by state plan requirements and EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) rules under 42 U.S.C. § 1396d(r), relevant to the Medicaid eligibility and enrollment framework.

Common scenarios

Well-child visits and developmental screenings: Under HRSA Bright Futures, well-child visits at specified intervals from birth through age 21 are covered without cost-sharing. These include standardized developmental screenings (e.g., M-CHAT for autism spectrum disorder at 18 and 24 months), vision and hearing assessments, and age-appropriate immunizations under the ACIP schedule.

Adult preventive screenings: The USPSTF recommends colorectal cancer screening for adults aged 45 to 75 years (Grade B for ages 45–49; Grade A for ages 50–75) (USPSTF, 2021). Colonoscopy ordered as a primary screening qualifies for $0 cost-sharing. If polyps are discovered and removed during the same procedure, some plans have historically reclassified the encounter as diagnostic — a billing distinction addressed in guidance from CMS and under the Consolidated Appropriations Act, 2023.

Preventive vs. diagnostic mammography: A screening mammogram for an asymptomatic woman falls under the USPSTF recommendation and is covered without cost-sharing. A diagnostic mammogram ordered because of a palpable lump, abnormal screening result, or symptom is a diagnostic service and is subject to standard cost-sharing. This distinction illustrates the fundamental boundary between preventive and diagnostic categories.

Annual wellness visits for Medicare: Medicare Part B covers an "Annual Wellness Visit" (AWV) — a distinct benefit from the "Welcome to Medicare" visit — at no cost. The AWV does not include a physical examination; it involves a health risk assessment, cognition screening, and personalized prevention plan. It is not equivalent to a routine physical under commercial ACA rules.

Immunizations: ACIP-recommended vaccines for adults — including influenza (annually), Tdap, shingles (Shingrix, 2-dose series for adults 50+), and RSV vaccine for eligible adults — are covered without cost-sharing under compliant commercial plans. The specific age and risk-group eligibility criteria are maintained in the CDC immunization schedule.

Decision boundaries

The most operationally significant boundary is preventive versus diagnostic. The IRS, CMS, and the Departments of Labor and Health and Human Services have each addressed this distinction in guidance documents. The general rule: a service is preventive when ordered for an individual without signs, symptoms, or a prior diagnosis of the condition being tested. The same service — a colonoscopy, a blood glucose test, a mammogram — becomes diagnostic when ordered in response to symptoms or a known condition, and standard plan cost-sharing applies.

A secondary boundary separates in-network from out-of-network delivery. The no-cost-sharing mandate applies when the service is delivered by a network provider. Patients who access preventive services from out-of-network providers may owe cost-sharing unless no in-network alternative exists. Details on this distinction are covered under in-network vs. out-of-network providers.

A third boundary separates covered preventive services from screening add-ons or ancillary tests ordered during a preventive visit. A lipid panel ordered as part of a cardiovascular risk assessment pursuant to a USPSTF recommendation is preventive. A hemoglobin A1c test ordered because a patient reports symptoms of hyperglycemia is diagnostic. Plans are permitted to apply cost-sharing to the diagnostic component of a mixed visit even when the visit itself was scheduled as preventive.

Grandfathered plan status creates an additional boundary. Patients enrolled in grandfathered plans are not entitled to $0 cost-sharing preventive benefits under ACA Section 2713. The plan's Summary of Benefits and Coverage (SBC), required under 45 CFR § 147.200, must disclose grandfathered status.

A comparison of two primary statutory populations illustrates the structural difference in coverage mechanisms: