The 2027 ACO Calendar Is Not Slowing Down

September was a busy month for accountable care organizations preparing for 2027.

Participant rosters were finalized, overlap issues were addressed, elections were made, and organizations across the Medicare Shared Savings Program and the new Long-term Enhanced ACO Design (LEAD) Model moved another step closer to the next performance year.

But for ACO leadership teams, the calendar is not slowing down.

October brings the next important stage in the Shared Savings Program application cycle. CMS lists Phase 1 final dispositions for October 20 and Phase 2 submissions for October 21 through 30. November brings the Phase 2 request-for-information window, and the December 9 through 16 signing event precedes LEAD’s January 1 launch.

There are plenty of dates to track.

But I think there is a bigger question ACO leaders should be asking right now:

"Will the organization behind all of those deadlines actually be ready to perform in 2027?"

Because getting through an application cycle and building an organization capable of succeeding in value-based care are two very different things.

CMS publishes the deadlines. Strong organizations manage the work that happens between them.

October Moves the Focus From Application to Operations

For organizations pursuing a January 1, 2027 Shared Savings Program agreement start date, October represents an important transition in the application process.

CMS lists Phase 1 final dispositions for October 20. They provide greater clarity around the organization that will move forward, including participant and skilled nursing facility affiliate determinations and other program eligibility decisions. During Phase 2 submissions from October 21 through 30, organizations submit additional information related to governance and organizational structure, along with applicable materials for specific program options.

Those are administrative requirements, but the implications go much further.

Once an organization has greater clarity around its participating providers, leadership should be asking what that network means operationally. What does the participant mix mean for the population the ACO expects to manage? Where are the greatest opportunities and risks? Are providers prepared for the coming year? Does the organization have the right care management resources, technology, analytics, workflows, and leadership structure to support them?

Those questions will never appear as boxes to check in an application.

But they can have far more impact on 2027 performance than simply meeting the next submission deadline.

Governance Should Reflect How the Organization Actually Operates

Phase 2 also brings governance into focus.

It can be easy to view an organizational chart or governing body structure as another CMS requirement, but governance becomes much more important once an ACO is actually managing clinical and financial performance.

Who has authority to make decisions? Who owns performance? How quickly can leadership respond when utilization begins moving in the wrong direction? Who is accountable when a provider group is underperforming or a workflow is not producing the expected result?

A strong governance structure should not exist simply to satisfy an application requirement.

It should support the way the organization intends to operate.

That means leadership should use this period not simply to validate documentation, but to make sure roles, accountability, communication, and decision-making structures are ready for the year ahead.

Year-End Reporting Should Not Become a Year-End Scramble

November and December bring additional reporting and compliance considerations, including MIPS-related decisions for affected clinicians and groups.

For organizations managing multiple physician groups, this can quickly become complicated. Clinicians may have different eligibility statuses, reporting structures, technologies, and internal responsibilities.

The mistake is waiting for the deadline to start figuring those things out.

By the time a reporting deadline arrives, leadership should already understand who is affected, how reporting will be handled, whether technology or data gaps exist, and who is responsible for execution.

The same principle applies well beyond MIPS.

If every CMS deadline creates a fire drill, the problem probably is not the calendar.

It is the operating model behind it.

December Should Be About Readiness, Not Just Signing

December brings the final stages of the Shared Savings Program application cycle, including final application dispositions and the December 9 through 16 annual signing event.

That creates a relatively short period between final CMS decisions and the beginning of the new performance year.

Organizations that wait until December to begin thinking about operational readiness are putting unnecessary pressure on leadership at precisely the time they should be focused on execution.

By then, provider participation, governance, financial strategy, operational responsibilities, data needs, and performance priorities should already be well understood.

The final signature should confirm the organization is ready to participate.

It should not trigger the beginning of the work required to make participation successful.

LEAD Raises the Stakes for 2027

January 1 also marks the beginning of the new LEAD Model.

CMS designed LEAD as a voluntary 10-year accountable care model running from January 1, 2027 through December 31, 2036. The model builds on earlier Innovation Center accountable care work while seeking broader participation from organizations including smaller independent and rural practices and providers serving specialized or high-needs populations.

The optional Implementation Period began September 15 and runs through December 31, giving participating organizations time to prepare ahead of the first performance year.

For those organizations, the remaining months of 2026 are not an administrative waiting period.

They are an operational readiness period.

Risk arrangements, beneficiary alignment, provider engagement, payment mechanisms, care management strategies, financial modeling, technology, data infrastructure, quality, and compliance all need to come together before the performance year begins.

And because LEAD is designed as a 10-year model, organizations should be thinking beyond launch.

The goal should not be to build something that works on January 1. It should be to build an operating model capable of evolving and performing for years.

January 1 Should Not Be the Starting Line

This is where I think healthcare organizations sometimes get caught.

A new contract, program, or performance year has a start date, so that date naturally becomes the focal point.

But operationally, January 1 is already late.

Provider engagement should be underway. Performance priorities should be clear. Teams should understand their responsibilities. Care management strategies should reflect the population being served. Data and reporting processes should be tested. Leadership should understand where the organization is most vulnerable and where the greatest opportunities exist.

There will always be adjustments once the year begins. That is the reality of value-based care.

But there is a significant difference between adjusting an operating strategy and trying to build one while the performance clock is already running.

The Calendar Behind the CMS Calendar

Taken individually, every CMS deadline represents a specific administrative requirement.

Taken together, they tell a much bigger story.

Provider rosters affect attribution and beneficiary alignment. Governance affects decision-making and accountability. Reporting requirements affect clinicians and practices. Participation decisions affect financial exposure. Technology and analytics affect whether leaders can see what is happening soon enough to respond. Provider engagement determines whether the strategy developed by leadership actually reaches the point of care.

None of those things operates independently.

That is why preparing for 2027 cannot simply be an exercise in deadline management.

There is another calendar running behind the CMS calendar.

It includes provider communication, workflow design, technology implementation, financial modeling, care management planning, performance monitoring, leadership decisions, training, growth strategy, and dozens of other activities that have to happen before the official deadline arrives.

When those functions are disconnected, every deadline becomes an emergency.

When they are aligned, the organization can spend less time reacting and more time managing performance.

The Next 90 Days Matter

The remainder of 2026 will move quickly.

Shared Savings Program organizations will move through the remaining application process and final participation decisions. Organizations entering LEAD will move from implementation toward the beginning of a new 10-year accountable care model.

But the real opportunity over the next several months is bigger than staying ahead of a CMS calendar.

It is using this time to look honestly at the organization that will enter 2027.

Are your providers engaged? Are your teams aligned? Are responsibilities clear? Does your technology support the work or add complexity to it? Can leadership see performance early enough to make meaningful changes? Are you carrying forward initiatives because they are working, or simply because they already exist?

And perhaps most importantly:

"Are you prepared to perform, or are you simply prepared to participate?"

, Kristi Stovall

That is the question I would want every leadership team asking before January 1.

How Sunflower Health Advisors Can Help

At Sunflower Health Advisors, we work with organizations across the value-based care ecosystem that are entering new models, expanding existing programs, navigating growth, or trying to solve the operational challenges standing between strategy and performance.

Sometimes that means helping leadership evaluate the operating model. Sometimes it means provider strategy and engagement, technology and analytics, workflow redesign, growth strategy, population health, or bringing experienced operators to the table to help connect pieces that have historically lived in separate parts of the organization.

Our team has worked across ACOs, provider organizations, health systems, payers, healthcare technology companies, and other organizations navigating the transition to value-based care.

Explore how we help leadership teams prepare for new models and turn strategy into operational performance through value-based care consulting.

We understand the CMS calendar. But our real focus is helping organizations manage everything that has to happen between those dates.

Because January 1 will be here quickly. The goal should not simply be to get there. The goal is to be ready when it arrives.

Program dates are subject to change. Confirm current deadlines and requirements directly with CMS.