A post-discharge follow-up call costs a few dollars to place. The readmission it can prevent costs about $16,300. That ratio alone should make follow-up calling one of the easiest business cases in healthcare. And the readmission is only the first of four mechanisms, all pointing at the same narrow window after discharge.
Four ways the money moves
The readmission itself. AHRQ's Healthcare Cost and Utilization Project puts the average cost of a 30-day all-cause adult readmission at $16,300. That is more than the $14,500 the admission before it cost. For a hospital or a risk-bearing plan, one avoided readmission pays for a very large volume of outreach.
The penalty on top of it. Under the Hospital Readmissions Reduction Program, CMS reduces base Medicare payments by up to 3% for hospitals with excess readmissions across six tracked conditions. In FY2026 roughly 78% of the hospitals evaluated carry a penalty of some size. The number penalized 1% or more rose to 240, up from 208 the year before. Even hospitals with strong overall quality ratings commonly carry penalties on individual conditions.
The revenue left on the table. Transitional Care Management billing reimburses about $201 under CPT 99495 and about $273 under CPT 99496. Both codes require interactive contact with the patient within two business days of discharge. Read that requirement carefully. A discharge cohort that is not being reached inside that window is not just a clinical gap. It is unbilled revenue, month after month.
The quality-measure overlay. Post-discharge contact feeds the measures behind Star Ratings and shared-savings performance. It also feeds HCAHPS, where communication about medicines and discharge information score persistently among the lowest areas of the survey.
The uncomfortable question
None of this is news. The economics are well known, and nearly every health system already has a post-discharge calling protocol, at least on paper. The question that decides whether any of the four mechanisms pays out is much narrower: what fraction of the eligible cohort is actually reached?
That number is usually lower than leadership assumes. It is also a number the evidence base barely tracks. A 2024 VA systematic review of post-discharge contact programs found that virtually none of the studies it examined checked whether patients had received the contact at all.
Where reach has been measured, the picture is sobering. One cluster-randomized trial made a minimum of five attempts per patient, with a research team counting every one, and reached 69% of the intervention group. That is close to the ceiling under study conditions. A discharge unit working a daily list does not get five attempts per patient. The same trial found that a single call did not move readmissions, and its authors concluded that higher-intensity support was needed. That conclusion is the case for follow-up calling, not against it. One call is not a program. What works is persistence, and persistence is a staffing problem long before it is a clinical one.
The gap between the protocol and the reach rate is where the $16,000 phone calls quietly don't happen.
Our whitepaper, The Follow-Up Gap, lays out the full economics — and then explains why the calls don't get made, why they don't get answered, and what closing the gap takes.
Whitepaper
The Follow-Up Gap.
