BillAssist AI – A patient-first billing assistant

A 24/7 voice assistant that explains medical bills in plain language, starting with patients who are most at risk of medical debt.

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Inspiration

Medical bills are confusing, scary, and hit low-income, immigrant, and marginalized patients the hardest. I wanted to see what happens if every billing call gets answered by something calm, kind, and actually able to explain the bill in plain language.

What it does

BillAssist AI is a voice billing assistant you can talk to from the web page.

Patient talks like they would on a real call: “Why is this bill so high?”

The assistant explains deductibles, co-insurance, and adjustments in simple terms.

It keeps answers short, offers payment plan options, and can hand off to a human if needed.

For the demo, it walks through realistic example bills so you can hear how it would work in a safety-net hospital or clinic.

How we built it

How we built it

Frontend in Lovable (React/TypeScript) for the landing page and “Start Voice Demo / End Call” button.

Vapi for the voice assistant, using a custom system prompt that:

Describes the sample bill,

Forces plain language,

Stays focused on billing, not medical advice.

The button calls Vapi’s Web SDK to start and stop live calls in the browser.

Challenges we ran into

Challenges we ran into

Scoping everything into one day without overbuilding.

Getting the voice to sound clear and supportive instead of robotic or lecture-y.

Wiring Vapi into the generated React app and keeping call state in sync so the button actually starts and ends calls correctly.

Accomplishments that we're proud of

Accomplishments that we're proud of

You can talk to the prototype live and hear it explain a bill in real time.

The flow is simple: one button, one patient scenario, no confusing menus.

The design keeps DEIJ in mind: low-literacy language, after-hours access, and a focus on patients who usually struggle most with billing.

What we learned

What we learned

Voice UX is emotional, especially around money and health. Tone matters.

Keeping things short and clear is surprisingly hard, but it makes the experience feel more inclusive.

Modern tools (Lovable + Vapi) make it possible for one person to ship a meaningful social impact prototype in a day.

What's next for BillAssist AI – A patient-first billing assistant

Connect to real billing systems so each caller’s actual visit and balance can be explained.

Add secure identity checks before sharing financial info.

Support multiple languages for immigrant and LEP patients.

Measure impact not just in cost savings, but in fewer confusing bills, fewer collections, and more patients who say, “I finally understand what I owe and why.”

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