Oak Street Integration Challenges and Writedowns
Devoted Health
The real signal is that owning Medicare Advantage lives and owning senior clinics is much harder to combine than it looks on paper. CVS bought Oak Street to steer Aetna members into tightly managed primary care, but the clinic model is expensive to scale, takes time to fill panels, and has required ongoing integration spending. By the end of 2024, CVS still had no goodwill impairment, but the care delivery unit was only modestly above carrying value, showing how little room for execution misses remained.
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Oak Street was bought for about $10.6B in 2023 as CVS pushed deeper into value based primary care for seniors. Oak Street had strong revenue growth before the deal, but it was also losing money while opening clinics, which means CVS inherited a business that needed years of ramp before margins could show up.
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CVS has disclosed acquisition related integration costs tied to Oak Street and Signify across 2024 and 2025 filings. In 2025, CVS said the Health Care Delivery unit continued to face challenges, changed leadership, slowed new clinic openings, and decided to close some Oak Street sites, which is the clearest sign the original rollout plan ran into operating friction.
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The broader lesson is that payer backed clinic ownership is not automatically a cost advantage. UnitedHealth can spread fixed costs across a much larger physician base, while Oak Street style clinics remain brick and mortar heavy and lower margin to scale, more like One Medical and other clinic operators than like software businesses.
Going forward, the winners in Medicare Advantage will be the companies that turn owned care assets into lower medical costs fast enough to justify the capital tied up in clinics. That points to slower, denser expansion, tighter market selection, and more pressure on CVS to prove Oak Street can lift Aetna margins rather than just add revenue.