A health plan's technology rarely fails in the sales demo. It fails at the seams, the places where a shiny new system has to exchange data with the dozen others that came before it.
No core platform operates alone. It has to move enrollment files, claims, eligibility, EDI transactions, and financials cleanly between systems that were built in different decades by different vendors with different assumptions. When those handoffs are fragile, the symptoms show up everywhere downstream: mismatched member records, rejected claims, reconciliation headaches, and reports nobody trusts.
Treat interfaces as first-class deliverables
Integrations are often the last thing planned and the first thing rushed, which is precisely why they break. Mapping data flows, agreeing on the source of truth for each field, and defining how errors are caught and resolved deserves the same rigor as the core build. The interface is not plumbing to be hidden; it's where the value either flows or leaks.
Most "system problems" in a health plan are really integration problems wearing a costume.
Test against reality, not happy paths
Clean test data hides the failures that matter. Real-world volumes, the messy historical records, the odd-but-legal edge cases, that's what a new integration has to survive. Testing against production-like conditions surfaces the breakpoints while they're still cheap to fix, rather than after a member or a regulator finds them.
Plan for the day after go-live
Integrations aren't "set and forget." File formats drift, partners change, regulations add fields. Building in monitoring, clear ownership, and a defined way to handle exceptions keeps small issues from quietly compounding into a crisis. The teams that watch their seams are the ones that sleep at night.
Get integration right and the technology fades into the background, doing its job. Get it wrong and it becomes the daily story, for all the wrong reasons.