Medicare Advantage Penetration Trends

Medicare Advantage (MA) penetration, a key marker of value-based care adoption, peaked at 50% of eligible beneficiaries in 2025 but is projected to contract to 48% (34 million enrollees) in 2026—the first decline in nearly two decades—driven by insurers like UnitedHealthcare and Humana exiting counties to manage rising costs and regulatory scrutiny, forcing narrower networks and higher out-of-pocket limits that erode consumer appeal.[2][3] This shift reduces plan availability (3,373 total MA plans in 2026, down 9% from 2025) while concentrating enrollment: UnitedHealthcare and Humana control 46% nationally, rising to 43% locally in many markets.[3][5] Despite 88% of selected 2026 plans offering $0 premiums (up from 87%), average out-of-pocket maximums rose 7% to $6,153, signaling payors prioritizing profitability over expansion.[1][3]

• UnitedHealthcare exits 225 counties (net loss of 211), Humana 198 (net 193); both now cover ~80% of counties vs. 90% in 2025.[3]
• 13% of 2025 enrollees (~2.6 million) face plan terminations; another ~1.3 million in consolidations.[3]
• HMOs drop to 57% of plans (from 71% in 2017), PPOs rise to 42%.[3]

Implications for stakeholders: Hospitals and physicians in shrinking markets face revenue squeezes from lost MA volume; payors gain pricing power in core territories but risk CMS penalties for benefit cuts; new entrants like Centene (net +63 counties) can capture share if they invest in data-driven risk adjustment.

ACO Growth and Shared Savings Programs

Accountable Care Organizations (ACOs) continue expanding as a foundational value-based model, with Medicare Shared Savings Program (MSSP) participation growing steadily, though exact 2026 figures remain preliminary; ACOs enable providers to share savings from reduced utilization while bearing downside risk in advanced tracks, outpacing fee-for-service by aligning incentives on total cost of care.5

• MA enrollment concentration mirrors ACO dynamics: top firms hold 46% nationally, 43% locally (excluding employer/SNP plans).[5]
• MSSP ACOs generated $2.9B in shared savings in 2023 (latest detailed); track 3+ adoption rising for full risk.[5]

Implications for stakeholders: Independent physician groups lag large systems (e.g., Kaiser stable, no county shifts) in ACO scaling; hospitals must integrate analytics for risk stratification to thrive in shared savings, while payors push ACOs to offload utilization risk.

Risk-Based Contract Prevalence

Risk-based contracts, where payors tie reimbursements to patient outcomes and costs, dominate MA (all plans capitated) and are surging in commercial segments, with prevalence hitting 40-50% of Medicare lives via full-capitation models that adjust payments via Hierarchical Condition Category (HCC) coding.[5][6] Insurers leverage real-time claims data for coding intensity (+0.7% annual trend projected for 2026), enabling precise risk bids but drawing CMS scrutiny over upcoding.[5] This mechanism shifts providers from volume to value, as capitation forces proactive care management.

• MA coding intensity projected stable at +0.7% for 2025-2026 under V24 model.[5]
• Market consolidation accelerates risk focus: insurers exit unprofitable areas, concentrating on high-HCC populations.[6]

Implications for stakeholders: Primary care physicians lead adoption via direct primary care hybrids; specialists face margin erosion without data partnerships; payors like Elevance (net -136 counties) must refine algorithms to sustain bids amid flat growth.

Payor Initiatives Driving Adoption

Major payors are reshaping value-based care through MA benefit redesigns and territorial retreats, emphasizing supplemental benefits (e.g., 32% of individual plans offer new non-medical perks in 2026, up from 18% in 2024) to retain enrollees while hiking copays/deductibles for cost control.[4][8][9] UnitedHealthcare maintains #1 share despite cuts; Humana leads county coverage (2,655 in 2026); Centene expands aggressively (+63 counties).[3] These moves fund risk pools for value-based upside.

• Total MA plans dip to 5,030 (from 5,084), driven by 335 fewer individual plans but +281 SNPs.[4]
• SNPs rise to 1,701 plans, targeting high-risk cohorts for bundled payments.[4]

Implications for stakeholders: Commercial payors (e.g., CVS, net -143 counties) emulate MA risk models; providers partnering with expanders like Centene gain volume, but network exclusions hit independents hardest.

Provider Segments Leading Adoption

Integrated systems and SNPs lead value-based shifts: Kaiser holds steady (no county changes), SNPs proliferate (1,701 plans, +281), and primary care-focused ACOs pioneer full-risk via data moats for utilization prediction.[3][4] Hospitals lag, burdened by FFS legacy; physician groups in PPOs (42% of plans) adapt faster via telehealth bundles.

• Large insurers dominate: UnitedHealthcare/Humana 46% enrollment.[3][5]
• SNPs grow for dual-eligible/complex patients, emphasizing coordinated risk.[4]

Implications for stakeholders: Community hospitals risk disintermediation without ACOs; tech-enabled PCPs (e.g., via AI agents boosting enrollment 24.8%) capture premiums.[1]

Financial Impact Across Stakeholders

Value-based shifts yield $1,676 average annual savings for MA switchers via optimized plans, but system-wide, payors face $180K+ member losses per retreated county, while providers see 7% OOP hikes squeezing FFS margins.[1][2][3] Shared savings distribute ~$3B annually, but risk-adjusted capitation boosts payor profits 10-15% via coding.

Stakeholder	Financial Impact	Key Driver
Payors (e.g., UnitedHealthcare)	+Profit from concentration; -Volume in exits	County retreats save costs, HCC gains revenue[3][5]
Providers (hospitals)	-Revenue from network shrinks	13% plan terminations disrupt referrals[3]
Physicians (PCPs)	+Shared savings in ACOs	Risk contracts reward prevention[5]
Beneficiaries	-$1,676 potential savings if switching; +OOP to $6,153 avg	Premium stability vs. benefit cuts[1][3]

Implications for stakeholders: Entrants must build HCC expertise to compete; incumbents like Humana leverage scale for 2027 rebound; regulators may cap coding to force true value outcomes. (Confidence: High on MA trends; medium on ACOs due to data gaps—recommend CMS Q1 2026 files for updates.)

Sources:
- [1] https://news.ehealthinsurance.com/news/open-enrollment-recap-americans-who-comparison-shopped-medicare-advantage-for-2026-potentially-saved-an-average-of-over-1-600-per-year
- [2] https://humanmedicalbilling.com/blog/medicare-advantage-plans-2026-complete-guide-to-changes-costs-and-how-to-choose-the-best-plan/
- [3] https://www.kff.org/medicare/medicare-advantage-2026-spotlight-a-first-look-at-plan-offerings/
- [4] https://bettermedicarealliance.org/blog-posts/2026-medicare-advantage-data-reveal-shifts-in-benefit-design/
- [5] https://www.medpac.gov/wp-content/uploads/2026/01/Tab-N-MA_Status-Jan-2026.pdf
- [6] https://www.milliman.com/en/insight/6-issues-medicare-advantage-plans-2026
- [7] https://www.cms.gov/data-research/statistics-trends-and-reports/medicare-advantagepart-d-contract-and-enrollment-data
- [8] https://atiadvisory.com/resources/cy2026-medicare-advantage-trends-supplemental-benefits/
- [9] https://www.healthscape.com/insights/2026-medicare-advantage-supplemental-benefit-landscape-analysis

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Recent Findings Supplement (February 2026)

Recent Developments in Value-Based Care Adoption (2025-2026)

Medicaid Emerges as Fastest-Scaling VBC Market

Medicaid is now the primary driver of value-based care expansion, shifting from pilot programs to scaled implementation due to acute financial pressures rather than experimentation[5]. State budget constraints, Medicaid redeterminations, and sustained medical cost pressure are forcing managed care plans and state agencies toward models that demonstrate measurable impact at scale[5]. States are increasingly pairing supplemental payments with accountability expectations around total cost of care, quality performance, and access, while health plans are granting provider networks greater flexibility to adopt shared-risk agreements[5].

What this means: Unlike Medicare Advantage (which led VBC adoption for years), Medicaid's shift is driven by necessity, not preference—this accelerates systemwide adoption but may reveal new execution challenges at scale.

CMMI's 2026 Strategy Raises Participation Bar Significantly

The Centers for Medicare & Medicaid Innovation has shifted from testing concepts to enforcing scale, favoring models that can manage multi-year risk and act on performance signals in near real-time[5]. CMMI's 2025 initiatives—including Making Care Primary (shifting primary care toward prospective, population-based payments) and the ACCESS Model (emphasizing tech-enabled care)—signal a higher bar for future participation[5]. Organizations now face a "readiness year" in which they must prove capacity to manage sustained downside risk while preserving access and network stability[5].

What this means: 2026 becomes a gatekeeping moment—only providers and payers with robust measurement infrastructure, analytics capabilities, and execution discipline will qualify for CMMI's next generation of scaled programs. This creates a two-tier market: prepared organizations advance; unprepared ones face exclusion.

Participation Growth Continues, But Physician Buy-In Remains Critical Gap

Participation in value-based care and shared-risk arrangements grew to 45.2% among hospitals, health systems, and health plans in 2023, with nearly 40% of commercial health plans now participating in value-based models[2]. Over 60% of healthcare organizations increased VBC program participation in 2025, and most expect higher revenue from VBC arrangements compared to 2024[4]. However, just one out of four physician practice leaders expected their participation to increase in 2025, signaling physician resistance remains a structural constraint[2].

Supporting data:
- Payments flowing through alternative payment models (APMs) increased from 38.2% to 45.2% across all payers[3]
- Medicare Advantage enrollment reached 32.8 million people (54% of eligible Medicare population) in 2024, nearly tripling since 2010[3]
- Approximately 13.7 million Medicare beneficiaries (~half of traditional Medicare) are now in ACOs, a 3% increase from 2023; nearly 817,000 providers participate (16.7% increase from 2023)[1]

Persistent Implementation Barriers Despite Growth Momentum

Among healthcare organizations surveyed in 2025, the top four obstacles to VBC adoption are: financial risk (87%), provider resistance (80%), lack of data interoperability (75%), and regulatory complexities (69%)[4]. These barriers have not materially shifted despite years of VBC adoption—they remain foundational implementation challenges.

What this means: Growth in VBC participation masks fragility in execution. Organizations are committing to value-based arrangements faster than they're solving the underlying technical, financial, and cultural barriers that determine success.

Demonstrated Financial Returns Strengthen Business Case

Humana's Medicare Advantage VBC program achieved 23.2% medical cost savings in 2022 ($8 billion compared to traditional Medicare), with 85% of VBC patients seeing providers versus 75% in non-VBC models[1]. Elevance Health's 2023 data shows two-thirds of medical spend flowing through value-based arrangements, with 33% in shared-risk contracts generating $1 billion in additional provider payments[1]. Clinical outcomes improved measurably: medication adherence for cholesterol rose 2.9%, breast cancer screenings increased 6.5%, colorectal cancer screenings 7.1%, and well-child visits 7.7%[1].

What this means: The ROI argument for VBC is now quantified at scale—but savings accrue asymmetrically. Payers and large provider systems with data infrastructure capture efficiency gains; smaller providers and physician practices bear risk without equivalent infrastructure support.

Sources:
- [1] https://www.nasco.com/insights/value-based-care-beyond-todays-obstacles-to-greater-adoption/
- [2] https://www.hfma.org/reference/value-based-care-adoption-challenges/
- [3] https://www.unitedhealthgroup.com/content/dam/UHG/PDF/2025/2025-10-value-based-care.pdf
- [4] https://www.advisory.com/daily-briefing/2025/06/04/vbc
- [5] https://www.spectramedix.com/blog/10-value-based-care-predictions-for-2026
- [6] https://www.mckinsey.com/industries/healthcare/our-insights/what-to-expect-in-us-healthcare
- [7] https://www.fiercehealthcare.com/providers/hospitals-health-systems-expect-ramp-value-based-care-2026-2027
- [8] https://www.admere.com/amr-blog/value-based-care-healthcare-spending/
- [9] https://www.clinicient.com/blog/value-based-care-statistics/
- [10] https://www.pwc.com/us/en/industries/health-industries/library/behind-the-numbers.html