What Low Wellness Participation Is Costing Your Company

Most benefits leaders track wellness program participation as a single number on a year-end slide, then move on. That number deserves far more scrutiny, because the gap between who completes a screening and who skips it maps almost perfectly onto where a self-insured employer's healthcare dollars go. When wellness program participation sits at 20 or 30 percent, the people missing from the data are not a random sample. They are disproportionately the employees with undiagnosed conditions, the ones whose claims will define next year's spend. Low turnout is not a marketing problem to be solved with a better email. It is a financial exposure that compounds quietly until it shows up in renewal projections.

"Ninety percent of the nation's $4.9 trillion in annual health care expenditures are for people with chronic and mental health conditions.", Centers for Disease Control and Prevention, Fast Facts: Health and Economic Costs of Chronic Conditions, 2024

The hidden math behind low wellness program participation

The cost of weak wellness program participation is rarely a line item, which is exactly why it goes unmanaged. The logic runs through claims, not through the wellness budget. According to the CDC's 2021 to 2023 data, 4.5 percent of US adults have undiagnosed diabetes, representing roughly 11 million people, and about 1 in 6 adults with high blood pressure do not know they have it. Nearly half of all adults, 48.1 percent, have hypertension. These are precisely the conditions a biometric screening surfaces, and precisely the conditions that become expensive when they progress untreated to an emergency room visit, a cardiac event, or a hospital admission.

When participation is low, the employees least likely to volunteer are often those who avoid the healthcare system altogether, which correlates with being undiagnosed. A program that screens only the already-engaged confirms what is already known and misses the population driving future cost. The RAND Corporation's 2014 analysis of PepsiCo, published in Health Affairs by Soeren Mattke and colleagues, found that disease management returned $3.78 for every dollar spent, largely through a 29 percent reduction in hospital admissions and roughly $1,632 in annual savings per member. None of that return is reachable if the at-risk member never participates in the first place.

Here is how the same program budget performs at different turnout levels for a hypothetical self-insured employer of 1,000 with a $275 per-employee program spend.

Participation scenario	Employees screened	Estimated at-risk individuals identified	Program spend	Cost per employee actually screened	Practical effect on healthcare spending
Low turnout (20%)	200	~30	$275,000	$1,375	Most undiagnosed risk stays hidden, costs surface as claims later
Moderate turnout (50%)	500	~75	$275,000	$550	Partial early detection, uneven risk visibility
High turnout (85%)	850	~128	$275,000	$324	Risk identified early, disease-management ROI becomes reachable

The figures are illustrative, but the pattern holds across every population analysis: the same fixed program spend produces a dramatically lower cost per meaningful result when participation is low, and the returns documented in the research literature only materialize at scale.

Three cost drivers tend to hide inside a low participation rate:

• Delayed diagnosis, where treatable conditions advance to high-cost interventions before anyone intervenes.
• Wasted fixed spend, since onsite events, vendor minimums, and administrative overhead are largely paid whether 20 or 80 percent of staff show up.
• Forfeited incentive leverage, where premium differentials and contributions tied to screening go unclaimed by the employees who most need the nudge.

Why turnout stays low

Low engagement costs are usually built into the screening model itself rather than caused by indifferent employees. The 2024 KFF Employer Health Benefits Survey found that 44 percent of large firms offer biometric screening, and among those, 65 percent attach an incentive or penalty. Yet median participation in programs without strong incentives still hovers near 20 percent. The friction is structural.

• Onsite events assume everyone reports to one building on one day, which excludes remote, hybrid, deskless, and shift workers.
• Fasting requirements and clinic appointments compete with deadlines, childcare, and commutes.
• Privacy concerns make some employees reluctant to have results collected at work.
• The experience offers little immediate value to the individual, so participation feels like a favor to HR rather than a benefit.

Incentives can push numbers up, sometimes to 99 percent when penalties are steep, but coercion-heavy designs raise compliance questions and rarely change the underlying behavior. The more durable fix is removing friction so that participating is easier than opting out.

Industry Applications

Self-Insured Employers

For self-insured organizations, the connection between wellness program participation and healthcare spending is direct, because the employer bears claims risk. Every undiagnosed case identified early is a potential avoided claim on the employer's own balance sheet. Raising participation from 20 to 80 percent does not just improve a wellness metric. It widens the population in which the disease-management ROI documented by RAND can actually occur.

Benefits brokers and consultants

Brokers increasingly face employer clients who ask whether their wellness spend is producing anything. A program with documented high participation and clear risk-identification data is a defensible recommendation at renewal. A program stuck at low turnout is a liability the broker will eventually be asked to explain.

Distributed and deskless workforces

Manufacturing, retail, logistics, and field-service employers have historically been the hardest to screen, and they often carry significant chronic-disease risk. For these populations, the participation problem and the cost problem are the same problem, and a delivery model that does not require a conference room is the only realistic path to meaningful turnout.

Current research and evidence

The evidence base points consistently in one direction: returns come from reaching at-risk people early, and that requires participation. The RAND PepsiCo study (Mattke et al., Health Affairs, 2014) remains the most cited analysis, separating the strong returns of disease management from the weaker, slower returns of general lifestyle programs. Its broader study of nearly 600,000 employees across seven employers reached a sobering conclusion: wellness programs show little immediate effect on overall healthcare spending, with disease management as the primary driver of ROI. The implication for benefits leaders is that screening matters most as a detection mechanism that feeds people into management programs, not as a standalone activity.

Layer that onto the CDC's finding that 90 percent of the nation's $4.9 trillion in annual healthcare spending goes to people with chronic and mental health conditions, and the strategic priority becomes clear. The money follows chronic disease. Screening is how chronic disease gets found. Participation is the rate-limiting step on the whole chain. A program that cannot move participation cannot move spending, regardless of how well-designed its downstream coaching may be.

The future of wellness program participation

The trajectory of the field is away from the one-day onsite event and toward continuous, low-friction, employee-controlled assessment. Several shifts are already visible:

• Phone-based and remote screening that lets employees complete an assessment without travel, fasting logistics, or a scheduled clinic visit.
• Participation measured as an ongoing rate rather than an annual snapshot, with reminders and re-engagement built in.
• Tighter integration between screening data and disease-management referral, closing the gap RAND identified between detection and intervention.
• Greater attention to privacy and individual value, so employees see a reason to participate beyond an incentive.

The employers who treat participation as the central design constraint, rather than an afterthought, will be the ones who finally connect their wellness spend to their claims experience.

Frequently asked questions

Why does low wellness program participation cost more than no program at all?

Because most program costs are fixed. Onsite events, vendor minimums, and administration are paid regardless of turnout, so low participation produces a high cost per person screened while leaving the highest-risk employees undetected. Those undiagnosed cases then surface later as expensive claims, meaning the employer pays twice: once for the underused program and again for the avoidable claim.

What participation rate should a self-insured employer aim for?

There is no universal threshold, but the returns documented in research only become reachable when a meaningful share of the at-risk population is screened. Many programs without strong incentives stall near 20 percent. Moving toward 70 to 85 percent dramatically lowers the cost per identified risk and widens the population eligible for disease management.

Do incentives fix low participation?

Incentives raise numbers, sometimes to 99 percent when penalties are large, but they treat the symptom rather than the cause. Heavy penalties raise compliance and equity concerns and do little to change behavior. Removing friction from the screening experience tends to produce more durable participation than financial pressure alone.

How does participation connect to healthcare spending specifically?

The CDC attributes 90 percent of national healthcare spending to people with chronic and mental health conditions, and a large share of those conditions are undiagnosed. Screening is how those conditions get identified early, and participation determines how many are caught. Low participation means undiagnosed risk stays hidden until it becomes a claim.

Circadify is working on this exact problem space, building screening approaches that let employees complete a health assessment from their phone so that participation is no longer gated by a conference room and a calendar. If you want to see what closing the participation gap could mean for your own population and spend, request an enterprise wellness demo and model the numbers against your group.