Surgical bundles produced real but modest savings from post-acute care, without the patient selection critics predicted. Medical episodes are a different story.
Bundled payment has one of the better evidence bases in value-based care, because the models were large, mandatory in places, and studied with real comparison groups. The findings are consistent and they are more modest than the enthusiasm around bundles suggests.
The joint replacement result
The two-year evaluation of CJR found “greater decreases in institutional spending per joint-replacement episode in treatment areas than in control areas (differential change, -$812, or a -3.1% differential decrease).” The mechanism was specific: a 5.9 percent relative decrease in discharges to post-acute care facilities.
On safety, “the CJR program did not have a significant differential effect on the composite rate of complications.” The authors concluded that “in the first 2 years of the CJR program, there was a modest reduction in spending per hip- or knee-replacement episode, without an increase in rates of complications.”
Note the word the authors chose. Modest. A 3.1 percent reduction is real and worth having, and it is not transformation.
The selection question, answered
The standard objection to episode payment is that accountable parties will avoid complex patients, making results look good without producing anything. This was tested directly.
A study of hospital participation in bundled payments found that participation “was not significantly associated with a change in overall market-level volume,” and that among twenty demographic and clinical factors examined, participation “was associated with differential changes in hospital-level case mix for only 1 factor.” The authors concluded that participation “was not associated with changes in market-level lower extremity joint replacement volume and largely was not associated with changes in hospital case mix.”
That is a negative finding worth stating plainly, because it cuts against a widely repeated criticism. In joint replacement bundles, hospitals did not measurably cherry-pick.
Surgical versus medical
The pattern that recurs across every bundling program is that surgical episodes work better than medical ones. Surgical episodes have a clear trigger, a predictable course, and a small set of standardizable decisions, principally where the patient goes after discharge. Medical episodes for conditions like heart failure and pneumonia begin unpredictably, vary enormously in course, and offer fewer decisions a hospital can standardize.
The consequence shows up in target price accuracy rather than only in clinical difficulty. When historical spending is highly variable, a target built from it is a poor prediction, and results reflect the accuracy of the prediction as much as the quality of the care.
Worth remembering: put the two findings together and a specific conclusion follows. Bundles reliably reduce post-acute utilization for procedures where post-acute utilization was discretionary in the first place. That is a genuine efficiency gain and it is also a one-time gain: once a hospital has moved its appropriate patients from skilled nursing to home health, the lever is spent. Sustained savings from bundles requires either new levers or new episode types, and the honest question for any hospital entering TEAM is what it will do in year four after the discharge-planning gains are banked.
Key takeaways
- CJR reduced institutional spending per episode by $812, a 3.1 percent differential decrease, without increasing complications.
- Savings came from a 5.9 percent relative decrease in discharges to institutional post-acute care.
- Bundling did not measurably change market volume or hospital case mix, so the selection critique was not borne out.
- Surgical episodes outperform medical episodes, largely because their historical spending is predictable enough to price.
Sources
- Barnett et al., Two-Year Evaluation of Mandatory Bundled Payments for Joint Replacement, NEJM 2019 (opens in a new tab)
- Navathe et al., Association of Hospital Participation in a Medicare Bundled Payment Program With Volume and Case Mix of Lower Extremity Joint Replacement Episodes, JAMA 2018 (opens in a new tab)
Check your understanding
Where did the savings in joint replacement bundles actually come from?
The two-year CJR evaluation found a 3.1 percent differential decrease in institutional spending per episode, driven by a 5.9 percent relative decrease in discharges to post-acute care facilities, with no significant differential effect on complications.