The Department of Labor has proposed a PBM transparency rule with a March 31 comment deadline, adding regulatory teeth to the legislative reforms in the Consolidated Appropriations Act. The proposed rule would require employer-sponsored health plans to disclose PBM compensation arrangements, rebate retention rates, and spread pricing margins — giving plan sponsors the data they need to evaluate whether their PBM is acting as a fiduciary or extracting margin.

DOL's ERISA authority gives it jurisdiction over the roughly 150 million Americans covered by employer-sponsored health plans. The proposed rule targets a specific information asymmetry: plan sponsors — employers — have historically lacked visibility into how much of the rebate revenue their PBM collects actually flows back to the plan versus being retained as profit. Ropes & Gray's analysis notes that the rule would require PBMs to report in standardized formats that allow direct comparison across contracts, eliminating the custom terminology and calculation methodologies that PBMs have used to obscure economics.

For dental practice owners who provide employee health benefits, the DOL rule creates an opportunity to renegotiate PBM contracts with better information. For practices contracting with PBMs for dental pharmacy benefits, the transparency requirements will reveal whether spread pricing on dental prescriptions is inflating costs. The March 31 deadline is tight — dental and medical trade associations should be filing comments now. The combination of legislative reform and DOL rulemaking creates a regulatory pincer that will fundamentally reshape PBM economics within 24 months.

What to watch: Whether the final DOL rule includes enforcement mechanisms with financial penalties — transparency requirements without consequences become disclosure exercises rather than behavioral reform.