The single most important distinction in value-based evidence, and the one most often blurred. This lesson makes it concrete.
If you take one number-reading skill from this course, take this one: the difference between gross and net savings. It is the distinction most often blurred in press releases and most often decisive in honest evaluation. A program can generate real gross savings and still lose money for the payer.
The two numbers
- Gross savings are the reduction in medical spending: how much less care cost than the counterfactual.
- Net savings are what is left after subtracting the money the program paid out and cost to run: shared-savings payments to providers, care-management funding, and administrative overhead.
Net savings = gross savings - shared-savings payouts - program costs
Gross is the number in the headline. Net is the number that matters to the taxpayer or payer. They can point in opposite directions.
A worked example
| Line | Amount |
|---|---|
| Gross reduction in medical spending | $200 million |
| Shared-savings paid to providers | -$150 million |
| Program operating costs | -$80 million |
| Net result to the payer | -$30 million |
The program genuinely lowered medical spending by $200 million. It also paid providers $150 million to do it and cost $80 million to run. The payer is $30 million worse off. Both “the program saved $200 million” and “the program cost the payer $30 million” are true, and only the second answers whether it was worth funding.
Why this is the CMMI story
This distinction is exactly why the Innovation Center’s record looks different depending on the number you read. Individual models often produced gross savings, yet the CBO found that CMMI increased net federal spending over its first decade, because operating costs and payouts exceeded the medical savings. Gross and net are not a technicality; they are the difference between the optimistic and the sobering account of value-based care, and both are describing the same programs. Module 5 returns to this record in full.
How to read for it
- When you see “saved $X,” ask: gross or net? If it does not say, assume gross, the more flattering number.
- Look for whether shared-savings payments and program costs were subtracted.
- For a public program, the net-to-the-taxpayer figure is the one that answers “was this worth it.”
Key takeaways
- Gross savings are the drop in medical spending; net savings subtract payouts and program costs.
- A program can produce real gross savings and negative net savings, leaving the payer worse off.
- CMMI’s mixed record is largely a gross-versus-net story; always find out which number you are reading.
Check your understanding
A program reduces medical spending by $200 million but pays out $150 million in shared savings and costs $80 million to run. What is the net result to the payer?
Gross savings were $200M, but $150M in shared-savings payments plus $80M in program costs total $230M, so the payer is $30M worse off. Gross savings can be real while net savings are negative.