Service-line carve-in integrated funding pilots are designed for a common weakness in multi-agency reform: a pathway may be described as integrated, but important parts of the real service model still sit outside the funding structure. Pharmacy support may remain separately reimbursed. Transport may be excluded. Housing liaison may still be funded through another route. Behavioral-health follow-up may be technically “partnered” but not financially integrated. Over time, those exclusions can undermine the model because the pathway depends on functions the shared budget does not actually control. As explored across the Impact Insights Hub’s analysis of integrated funding pilots and its wider review of new service models, carve-in pilots are intended to close that gap. They bring previously separate services into the shared funding architecture in a sequenced, governed way so the financial model better matches how delivery really works.
Why carve-in models are used
Many integrated funding arrangements begin with a limited scope because that is the only politically or operationally feasible place to start. A funder may pool hospital and community discharge money but leave pharmacy outside. A county may align crisis and outpatient behavioral-health budgets but keep housing support separate. A health plan may fund care coordination prospectively but leave transport or durable medical equipment in traditional reimbursement. These partial arrangements can still be useful, but they often create a false sense of integration because some of the most important pathway functions remain financially external.
That matters because excluded services do not stop affecting performance just because they sit outside the shared budget. If medication access fails, if transport falls through, or if housing navigation cannot be mobilized quickly enough, the pathway still breaks. Yet when those services are carved out, responsibility becomes blurred. Each partner can say the pilot itself is sound while pointing to an external funding stream as the source of failure. Carve-in models are used to address exactly that weakness.
Funders are increasingly interested in this approach because it offers a way to expand integrated accountability without forcing a risky all-at-once budget merger. But they also know that carve-in design can go wrong if services are added faster than governance, data visibility, or operational control can absorb them. That is why phased inclusion rules are as important as the inclusion decision itself.
What makes a service-line carve-in pilot credible
A credible carve-in model defines which services are being added, why they matter to pathway success, and what evidence shows the existing shared model is being distorted by their exclusion. It must also specify timing. Some services can be added early because they are tightly linked to core performance. Others may need later inclusion once coding, utilization tracking, and partner readiness are stronger. The point is not to maximize scope for its own sake. The point is to make the budget reflect the real drivers of outcome and risk.
Strong carve-in pilots also distinguish operational dependence from financial convenience. A service should not be pulled into the shared budget merely because one partner wants relief from its own cost pressure. There should be a clear service-design reason showing that the pathway cannot function accountably while that cost category remains external. That requirement is what protects carve-in models from becoming disguised cost transfer exercises.
Operational example 1: Carving pharmacy support into a discharge integration pilot
In day-to-day delivery, a discharge integration pilot for medically complex adults initially funds hospital transition staff, home-based follow-up, and equipment coordination, but leaves pharmacy support outside the shared budget. Over the first year, governance review shows that a high proportion of failed discharges, delayed recovery episodes, and avoidable readmissions are linked to unresolved medication access, reconciliation mismatches, and pharmacy closure timing rather than to weaknesses in home follow-up alone. The pilot therefore adds a pharmacy support carve-in, bringing medication troubleshooting, urgent refill coordination, and discharge prescription escalation into the shared funding model.
This carve-in exists because one of the most common failure modes in discharge integration is pretending medication continuity is just an external dependency. In reality, it is often one of the main determinants of whether the whole pathway succeeds. When pharmacy remains outside the shared budget, every partner can see the risk but no one is fully incentivized or resourced to solve it as part of the pathway itself.
If the carve-in does not happen, the operational consequence is familiar. Community teams continue to make strong first contact, equipment delivery may go well, and hospital documentation may be timely, yet the patient still deteriorates because prescriptions were not accessible or instructions were not reconciled properly. The pilot then appears partially successful but repeatedly fails on a predictable weakness that remains structurally underfunded.
The observable outcome includes faster medication problem resolution, stronger post-discharge stability, fewer pharmacy-related follow-up failures, and clearer accountability for one of the most important contributors to readmission risk. Funders can also review whether adding pharmacy to the shared model improved not only outcomes but also the honesty of pathway governance, since a previously “external” failure point is now part of the actual contract logic.
Operational example 2: Carving transport recovery into a behavioral-health continuity pathway
In routine delivery, a behavioral-health pilot links crisis diversion, outpatient continuity, peer support, and medication follow-up for adults with serious mental illness. The original funding model treats transport as out of scope, assuming existing local transport benefits or provider goodwill will cover travel. Over time, performance analysis shows that missed first appointments, poor follow-up after crisis, and uneven engagement in rural areas are closely linked to transport failure rather than to lack of clinical capacity. The pilot therefore carves transport recovery into the model, allowing flexible same-day transport support, urgent ride authorization, and transport troubleshooting after crisis discharge.
This carve-in exists because transport is often treated as a peripheral access issue when it is actually a core continuity issue. In behavioral-health pathways, especially after crisis, the difference between attending the first stabilizing appointment and missing it can determine whether the person re-enters emergency care quickly. If transport sits outside the model, the pathway is being judged on outcomes it cannot fully influence.
If the carve-in is absent, the operational consequence includes hidden dropout that looks like poor engagement. Providers may believe they are offering timely access, but clients still miss key contacts because no reliable way exists to bridge the travel barrier. The system then blames motivation or complexity when the real problem is that a pathway-critical service line remained financially invisible.
The observable outcome includes better first-appointment completion, lower missed-contact recovery burden, improved rural or transport-barrier equity, and a stronger link between crisis diversion and sustained community continuity. Those changes often make the whole behavioral-health funding model more credible because the budget is finally paying for a practical barrier it was previously pretending away.
Operational example 3: Carving housing liaison into a medically complex community care pilot
In day-to-day practice, a community pilot for adults with high acute use funds clinical navigation, home-based follow-up, and benefits coordination, but initially leaves housing liaison outside the shared financial model. As live delivery matures, leaders find that unstable tenancies, landlord access issues, and unsafe home environments are repeatedly driving failed recovery, missed visits, and avoidable emergency use. The pilot therefore adds a housing liaison carve-in, funding dedicated landlord escalation, housing-risk triage, and home-environment problem solving as part of the integrated budget rather than leaving those tasks to separate casework systems.
This carve-in exists because some pathways are only superficially clinical. A person may have the right follow-up plan, medication support, and home-based nursing, but if the tenancy is unstable or the living conditions are unsafe, the pathway still breaks. Leaving housing liaison outside the shared model can make the entire budget design feel clinically rational while remaining operationally incomplete.
If the carve-in is absent, the operational consequence is recurring failure at the boundary between healthcare and housing responsibility. Providers may continue documenting unsafe environments, unresolved landlord issues, or imminent housing loss while having no funded mechanism to intervene quickly enough. That results in repeated deterioration, unnecessary acute use, and frustration among staff who can see the cause of instability but cannot address it through the funded model.
The observable outcome includes better home-based continuity, fewer environment-related care failures, reduced acute escalation linked to housing instability, and a more realistic integrated pathway in which the budget finally reflects one of the real drivers of risk. For many systems, this is where the difference between nominal integration and genuine integration becomes visible.
Governance, funder expectations, and assurance
Service-line carve-in pilots require strong governance because every inclusion decision changes both cost exposure and accountability. Funders typically expect clear evidence that the excluded service materially affects pathway success, formal criteria for timing the carve-in, partner agreement on attribution and oversight, and protection against simply moving inconvenient costs into the shared model without operational justification. They also expect reporting to show whether the carve-in improved pathway integrity rather than merely increasing budget scope.
Two expectations matter especially. First, oversight bodies will expect carve-in sequencing to be disciplined enough that the model does not become financially unstable as new lines are added. Second, they will expect the new service line to be governed as a real part of the pathway, not treated as an appended budget category that still lacks meaningful operational ownership.
Why this model matters now
Service-line carve-in integrated funding pilots matter because many “integrated” models remain partially fragmented in the places where outcomes are actually won or lost. A strong carve-in strategy helps align the budget with real delivery so accountability becomes more honest and improvement more durable. A weak one can turn shared funding into a dumping ground for unresolved costs. For U.S. funders and providers trying to move from partial coordination toward genuinely integrated pathway financing, carve-in design is one of the most important emerging tools in the field.