For years, I treated Medicare Part D like a necessary evil. A compliance checkbox. Something you hand off to the PBM and hope for the best. I'm guessing a lot of you feel the same way.
After digging into the data, I reached a different conclusion. Medicare Part D is the most overlooked wealth-building tool we have in employee benefits, and almost nobody is talking about it.
Three Things You're Probably Missing About Part D
1. The Cleanest Data in Healthcare
We all know medication adherence drives costs. But Part D claims are different from medical claims. They're standardized. No network games. No facility fee tricks. When someone refills a statin, that's real behavior, not a doctor's suggestion. Most employers ignore this data because it sits in a silo. But if you connect it to retirement savings patterns, you get a crystal ball for both health and wealth.
2. The Cliff at 65 Nobody Warns You About
When employees move from employer drug coverage into Medicare Part D, their formulary, cost sharing, and pharmacy network change all at once. That shift can quietly break long-running medication routines. For years, Part D's coverage gap did measurable damage: one analysis found heart failure patients reduced adherence by 3.6 percent and diabetes patients by 10.3 percent while in the gap. The Inflation Reduction Act eliminated that gap in 2025 and capped out-of-pocket drug costs at $2,000, which early research ties to less cost-related nonadherence. But the transition still deserves attention. A retiree who drops a maintenance drug because a new plan handles it differently shows up later as an emergency visit, not a refill. Employers who assume Medicare has solved the drug problem are ignoring a downstream cost bomb.
3. The Hidden Pot of Money
The money is the part that gets me excited. Part D plans generate real rebate dollars. MedPAC reported manufacturer rebates averaged 23 percent of gross Part D spending in 2021, and a GAO review found PBMs retained less than 1 percent of those rebates, passing the rest to the plan sponsor. The value is there; the question is who captures it. What if an employer recovered a few hundred dollars a year of that rebate value and directed it into the employee's retirement account, tied to filling prescriptions on time?
Say the number is $300 a year. At 6 percent growth over 20 years, that compounds to roughly $11,000 of extra wealth. For doing what they should already be doing.
Why Isn't This Happening Already?
Three reasons, and they're all structural:
- Fragmented systems. The PBM doesn't talk to the recordkeeper. Nobody owns both the adherence data and the account.
- Fear of regulation. People worry about kickback laws or ERISA rules. But health-contingent wellness incentives have an established framework under HIPAA and ACA rules, with a reward ceiling of 30 percent of the cost of coverage. You need to structure it right.
- Misaligned incentives. A PBM paid to process claims has no reason to build a bridge to a retirement recordkeeper. That work falls outside its contract.
That's exactly why a new kind of system, one that connects health actions to automated wealth, makes so much sense. WellthCare, the first Health-to-Wealth Benefit System, operationalizes this connection by rewarding verified medication adherence and other preventive actions with automatic retirement contributions and spendable Store dollars.
What the Part D Redesign Changed
Part D's economics changed while most employers weren't looking. The Inflation Reduction Act eliminated the coverage gap in 2025 and capped enrollee out-of-pocket drug costs at $2,000 a year, with the cap rising to $2,100 in 2026. It also moved risk onto plans: plan liability in the catastrophic phase jumped from 20 percent to 60 percent of gross drug costs, while the federal share of catastrophic costs shrank. A non-adherent retiree now costs the plan more than before, because the plan holds more of the downside. For an employer that still sponsors retiree drug coverage through an employer group waiver plan (EGWP), the same redesign raises the value of keeping retirees adherent and capturing the rebate value the plan generates. The wealth play is the natural response to a redesign that made adherence and rebate capture matter more than they did before the redesign.
What You Can Do Right Now
Here's a practical plan that does not require new technology, only a new mindset.
- Find the value. If you still sponsor retiree drug coverage, check whether an employer group waiver plan is in place and who keeps the rebate value. Ask your PBM for a transparent breakdown: rebates negotiated, generic pricing, and adherence rates for employees approaching 65.
- Build a data bridge. Work with your TPA to connect pharmacy claims to your retirement recordkeeper under HIPAA's privacy rules. Define adherence as a health-contingent wellness program under ERISA.
- Design the incentive. Set the trigger at an 80 percent medication possession ratio over 12 months, and work with your advisors on the account structure and the 30 percent reward ceiling under HIPAA and ACA wellness rules. Fund the contribution from the rebate value the plan generates.
- Pilot it. Test with 100 retirees for one year. Track adherence, drug spend, and employee satisfaction. Better adherence is associated with fewer ER visits and hospitalizations, so the savings can show up on the medical side, not only in the pharmacy ledger.
The Bigger Picture
The playbook used to stop at cost management: squeeze rebates, negotiate harder. Part D works better understood as a behavioral wealth platform.
78 percent of Medicare beneficiaries are enrolled in a Part D plan. It has predictable cash flow. It has standardized data. No other benefit, not medical, not dental, not vision, offers this combination. When you connect adherence to automatic retirement funding, you turn a cost center into a wealth-building asset.
That's what "healthcare that pays you back" looks like in practice.
Part D as Capital
Medicare Part D deserves better than the compliance checkbox it usually gets. It is the most underestimated lever in the health-to-wealth equation. The benefits leaders who win the next decade see that prescription fulfillment is a wealth-creating behavior, and they build systems to prove it.
Are you ready to stop managing Part D as a cost and start using it as capital?