“The 4-week deployment that almost died on the HIPAA review.”
In Q1 2026 a regional health system in the Mid-Atlantic was losing patient calls at peak hours. Their front desk took 84 calls on an average Tuesday; 31% of those went to voicemail. That's lost revenue, lost trust, and lost outcomes.
The intervention: a Vapi voice agent backed by Claude, integrated with Epic for chart lookup and Salesforce for CRM. 4-week deployment, 2-person team (me + a clinical informaticist). Total project budget: $180K all-in.
Week 1. Scoped the call types — appointment booking (47%), prescription refills (22%), test result questions (16%), miscellaneous (15%). Built the call-tree taxonomy with the clinical informaticist. Vapi + Claude prototype handling 'appointment booking' only.
Week 2. Epic integration via FHIR. Started the HIPAA review in parallel — and it almost killed the project. The hospital's compliance officer wanted on-prem, which would have meant a different architecture. We ended up landing on a BAA with both Vapi and Anthropic + a private region for the LLM calls. Lesson: do the compliance work in week 1, not week 2.
Week 3. Expanded to prescriptions and test results. Voice testing with 6 patient volunteers. Bug fixes mostly around the warm-transfer-to-human pattern.
Week 4. Gradual rollout — 10% of inbound, then 50%, then 100% by Friday. Live monitoring dashboard for the clinical lead.
Outcome. Voicemail rate dropped from 31% to 6% in the first week. NPS lifted +22 points within a month. Total cost saved (in front-desk hours redirected to higher-value work): ~$340K/yr against the $180K project cost.
Full architecture diagram, integration patterns, the compliance memo template, and the things I'd do differently next time — below.
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