CMS ACCESS Model: Top Population Health Management Vendors in 2026

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Most health systems heading into 2026 are running their chronic care strategy across at least three separate platforms: one for EHR-based panel management, one for population analytics and risk stratification, and a care management workflow tool that was acquired a few years ago and hasn't been re-platformed since. 

The CMO sees one panel of hypertensive patients, the ACO analytics team sees a different one, and the care management team sees a third. None of these views reconcile cleanly, and the gap between them is where value-based contract performance gets lost.

CMS ACCESS makes that fragmentation expensive in a specific, measurable way. Outcome-Aligned Payments under the model run at $360 per patient per year for eCKM, $420 for CKM, and $180 for MSK and behavioral health, with 50% withheld and released only against validated clinical outcomes. Health systems participating as referral partners earn roughly $30 in co-management revenue every four months per patient per track, without absorbing outcome risk, but only if they can identify the right patients, keep care plans flowing back from the ACCESS Participant, and hold attribution clean against ACO benchmarks. ACCESS spend is excluded from those benchmarks for the first 18 months, but you still have to be able to see it.

This guide is written for VP and SVP Analytics leaders, CMOs, and population health executives at health systems and large ACOs considering ACCESS participation. The platforms ranked below are evaluated against that operational reality: whether they can unify fragmented chronic care data, support ACCESS program requirements, and generate documented performance in value-based contracts. 

PHM and VBC Platforms: How the Top Vendors Stack Up

1. Innovaccer

Best for: Health systems and ACOs that want a single platform spanning data, care management, CRM, and direct CMS ACCESS participation.

Innovaccer is built around four product layers that operate as one stack:

• Gravity is the data and AI foundation. It ingests data across clinical, claims, pharmacy, and social determinants sources into a unified longitudinal patient record.
• Atlas is the population health operating system that runs on top of Gravity. It continuously identifies and stratifies the full eligible population across all ACCESS tracks without manual review, turning an 80,000-life Medicare panel into an actionable, enrolled cohort. Innovaccer converts eligibility into enrolled lives through automated multi-channel outreach (SMS, IVR, email) and embedded point-of-care referral workflows, so the patient panel enters the program rather than sitting in a risk queue.
• Story Health by Innovaccer (a confirmed CMS ACCESS Participant) is the AI-powered chronic care delivery layer for cardiovascular, diabetes, and CKD populations. Once a patient is enrolled, care delivery runs on Adaptive Program Intelligence, which scales intervention intensity to each patient's clinical trajectory. A Story Health NP initiates care, reconciles medications, assigns remote monitoring devices, and captures baseline readings. 

Between visits, AI-powered coaching drives lifestyle goals, medication adherence, and clinical education, with automatic escalation when readings fall outside target range. When escalation is needed, the patient routes back to the referring PCP, with real-time updates on medications, labs, and milestones flowing directly into your systems.

• Cured is the healthcare CRM, Best in KLAS for the third consecutive year at 90.1.

Live dashboards track outcome targets by track, automated patient-reported outcomes collection runs throughout the care period, and FHIR-integrated submissions go directly to CMS.

The participation model keeps the economics straightforward. Innovaccer enrolls patients, delivers care, and bears the 50% OAP withhold if clinical outcome targets are not met. Your health system preserves 100% of FFS billing, earns co-management revenue of approximately $100 per patient per year, and retains patient relationships. All in-person care is referred back to your provider network.

Trust Markers

• CMS ACCESS status: First-cohort participant (Story Health Partners, eCKM + CKM tracks, accepted April 13, 2026) 
• KLAS 2026: Best in KLAS Data & AI Platform for Providers (93.2), Data Analytics Platform for Payers (90.5), Healthcare CRM (90.1) 
• Black Book 2026: #1 Population Health Data Integration, Activation & Analytics (30-vendor field, 2,193 respondents) 
• Scale: 80M+ patient records, 130+ organizations, trusted by six of the top 10 US health systems 

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Learn more about Innovaccer's ACCESS participation model →

2. Health Catalyst

Health Catalyst is built on the Ignite and Databricks lakehouse architecture, with risk stratification running on the Johns Hopkins ACG methodology, a combination that appeals to academic buyers who need to defend risk models to clinical faculty. 

The 2025 KLAS Population Health Management score was 75.0, against a market average of 84.5, with KLAS flagging a need for improved innovation. Care management is sold as acquired bolt-ons rather than bundled into the core platform. 

Why Choose Innovaccer

Care management, chronic care delivery, and CRM are all part of the same platform, not separate purchases, and Innovaccer holds direct ACCESS participant status.

3. Clarify Health

Clarify Health delivers a payer-centric longitudinal claims analytics platform powered by a dataset spanning 300M+ patient journeys. Its Clarify Advance solution leverages behavioral economics to boost physician engagement through targeted incentives.

Clarify describes its VBC contract tools as focused on benchmarking, performance tracking, and settlements, handing off to external care management vendors rather than managing care between visits.

Why Choose Innovaccer

While Clarify shines in contract analytics, it lacks integrated care management. Innovaccer's Galaxy combines analytics with end-to-end care navigation, holds the 2026 KLAS win at 90.5, and features direct CMS ACCESS model participation for zero-risk chronic care.

4. Lumeris

Lumeris manages 1.2M VBC lives through Essence Healthcare, which has held three consecutive 5-Star ratings, and was named an IDC MarketScape Leader for VBC consulting in 2025. The Tom AI platform, built on Google Cloud Gemini, is only available as part of a full managed-services engagement. Health systems that want to own their PHM stack rather than buy a services contract will find the model a poor fit.

Why Choose Innovaccer

Innovaccer is a licensable platform with 80M+ records, no services lock-in, and direct ACCESS participant status.

5. Elligint Health

Elligint Health was formed in January 2025 through the merger of HealthEC and VirtualHealth, carrying HealthEC's 2019 and 2022 Best in KLAS PHM wins and the FHIR-native HELIOS platform, which has strong Medicaid managed care and community health worker workflow depth. 

Post-merger integration is unproven, the combined product roadmap is still being communicated to market, and no established ACCESS outcomes reporting or FHIR submission capability has been demonstrated for the merged entity.

Why Choose Innovaccer

Innovaccer is proven at 130+ organizations with documented MSSP savings and direct ACCESS participation, not a merged entity still defining its combined roadmap.

6. Cotiviti

Cotiviti's Medical Intelligence, Star Intelligence, and Quality Intelligence products cover 300M+ lives across payer customers. The March 2025 acquisition of Edifecs added interoperability and population payment management, and the new "Virtual Jonathan" AI platform targets payment operations. Cotiviti sells to health plans and has no provider-facing care management workflows or CMS ACCESS participation.

Why Choose Innovaccer

Cotiviti is the right tool for a payer's risk adjustment and Stars team. Innovaccer is the right tool for health systems and ACOs that need care delivery and ACCESS participation.

7. Datavant

Datavant's network links 70,000+ health systems and 100% of US payers through tokenized patient matching, with 50M+ patient records on the platform. It holds the 2025 Best in KLAS Risk Adjustment ranking at 92.1, inherited from the September 2024 acquisition of Apixio, and the Clinical Insights platform for VBC payers and providers is still maturing. Datavant has no population health management workflows or care management delivery, and is not a confirmed CMS ACCESS participant.

Why Choose Innovaccer

Datavant is a data connectivity infrastructure. Innovaccer is the full-stack layer that runs analytics, care management, and direct ACCESS participation on top of unified data.

8. Optum Value Connect

Optum Value Connect is an AI-first VBC analytics and contract management platform. The defining issue for most health systems is channel conflict: Optum is the analytics arm of UnitedHealthcare, and systems that compete with UnitedHealthcare in commercial, Medicare Advantage, or Medicaid markets face real risk in routing sensitive population and cost data through an Optum-hosted platform. Value Connect's proven scale is limited given its 2025 launch. 

Why Choose Innovaccer

Innovaccer is a pure-play health system technology partner with no payer parent conflict, proven at 130+ organizations, with direct ACCESS participant status.

Evaluating population health management vendors for CMS ACCESS participation

How to evaluate population health management software for CMS ACCESS participation

1. Does the vendor hold direct CMS ACCESS participant status, or do they have a contracted entity that does?

Vendors without an ACCESS Participant entity cannot route Outcome-Aligned Payments, validate outcome measures inside the platform, or keep ACCESS spend cleanly excluded from ACO benchmarks. Ask for the CMS acceptance letter or participant agreement, not a marketing claim.

2. Is care management bundled into the platform, or sold separately?

ACCESS requires FHIR API integration, HRSN screening, HIE connectivity, and regular care plan updates back to referring PCPs. Stitching those requirements across an analytics vendor, a care management vendor, and a separate CRM introduces reconciliation work that erodes OAP economics.

3. Can the platform dynamically adjust intervention intensity across a chronic population?

Static care management protocols do not scale to eCKM and CKM cohorts. The platform should move patients between AI-only outreach, AI-plus-human hybrid, and high-touch human care based on engagement signals and clinical trajectory, with audit trails that satisfy CMS outcome validation.

4. What dollar value of MSSP savings have the vendor's ACO customers generated, and in which performance year?

A customer count tells you adoption. A program savings figure tells you whether the platform actually drives ACO performance. Ask for the most recent CMS Performance Year data, not a cumulative or estimated figure.

5. Does the vendor's parent company compete with your health system in commercial, Medicare Advantage, or Medicaid markets?

If yes, routing sensitive population, utilization, and unit-cost data through that vendor's platform is a material conflict-of-interest risk. Evaluate independence from payer parents as a hard criterion, not a soft preference.

Which population health platform is right for CMS ACCESS participation?

Of the platforms on this list, Innovaccer is the only one built to carry a health system into ACCESS as a confirmed first-cohort participant, with care management, data, and CRM bundled into the same stack. The other vendors serve real needs in adjacent categories, but none hold the same combination of ACCESS status, platform completeness, and documented chronic care outcomes.

See how Innovaccer's platform supports CMS ACCESS participation. Book a demo today.

PHMS Frequently Asked Questions (FAQs)

1. Is the CMS ACCESS Model a payment model or a delivery model?

Both. ACCESS (Advancing Chronic Care with Effective, Scalable Solutions) launched July 5, 2026, with 150+ participants across four tracks: eCKM, CKM, MSK, and Behavioral Health. Initial Period Outcome-Aligned Payments range from $180 (MSK and BH) to $420 (CKM) per patient per year, with reduced Follow-On Period amounts for eCKM, CKM, and BH. CMS withholds 50% of payments and releases them against validated clinical outcomes. ACCESS spend is excluded from ACO benchmark and performance year calculations for CY2026 and CY2027, with inclusion beginning in 2028.

2. Can a health system participate in ACCESS without becoming an ACCESS Participant directly?

Yes. Health systems can participate as referral partners, continuing fee-for-service billing while referring eligible patients to a contracted ACCESS Participant. Direct Participants cannot bill Medicare FFS for other services to their ACCESS-aligned beneficiaries during the active care period, which is why the referral-partner pathway preserves materially more net revenue for most health systems. Co-management payments to referring PCPs are approximately $30 every four months per patient per track, up to roughly $100 per year. Innovaccer's model routes referrals to Story Health Partners, the CMS-accepted entity, which absorbs the outcome risk.

3. Which 2026 Best in KLAS categories did Innovaccer win?

Three: Data Analytics Platform for Providers (Gravity, 93.2), Data Analytics Platform for Payers (Galaxy, 90.5), and Customer Relationship Management (Cured, 90.1, its third consecutive year).

4. What technical integrations does ACCESS require?

FHIR API integration (CMS published FHIR R4 specifications with twelve profiles and seven subscription event types), HIE connectivity or a similar trusted network, regular care plan updates returned to referring PCPs at treatment initiation, completion, and defined clinical milestones, and validated outcome measure reporting by track (blood pressure, HbA1c, and eGFR for CKM; validated PROMs including PHQ-9 and GAD-7 for BH; BPI, QuickDASH, and LEFS for MSK).

5. How does Adaptive Program Intelligence work in practice?

It dynamically adjusts intervention intensity across a chronic population based on each patient's engagement signals and clinical trajectory. Patients with stable readings and strong engagement receive AI-only outreach through automated SMS, IVR, and email. Patients whose readings drift or whose adherence falls move into an AI-plus-human hybrid pathway with care manager involvement. Patients with rising clinical risk or a recent inpatient event move into high-touch human care management. This dynamic reassignment is what makes Outcome-Aligned Payments economically viable across an eCKM or CKM cohort at scale.

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