Case Study
How BillDecoder shipped an AI medical bill auditor on 3 platforms in 4 months
BillDecoder reads any medical bill, flags the errors line by line, and drafts a ready-to-sign dispute letter, all in under 2 minutes.
Starting from Specode's HIPAA-ready foundation, BillDecoder went from discovery to launch on web, iOS, and Android in 4 months.
Client
BillDecoder
Industry
Healthcare AI · Billing transparency
Platforms
Web · iOS · Android
Timeline
4 months to launch
The Challenge
A wall of codes patients can't fight
Bills arrive as dense, multi-page stacks of procedure codes, and disputing a single line means long fights with insurers and no clear sense of what's actually owed.
The founder, a physician, wanted an app that reads a phone snapshot of any bill and hands back a defensible dispute letter. That meant handling PHI and parsing messy real-world documents, all on an MVP timeline spanning 3 platforms.
~80% of US medical bills contain errors
Healthline
The Solution
A HIPAA-ready foundation, with custom AI built on top
The Specode team assembled BillDecoder's account, data, and interface layers from prebuilt components, then spent the saved time on the part no shelf provides: the AI audit engine.
HIPAA-ready starter
Authentication came prewired to Convex, Specode's HIPAA-compliant backend, live from week one.
UI components on the shelf
Prebuilt interface components let the team assemble screens fast and restyle them as feedback came in.
Custom AI audit engine
Hathr.ai on Claude catches upcoding, unbundling, duplicates, and math errors, with a confidence score on every flag.
Multi-page document processing
Real bills arrive as photos, PDFs, and scans. AWS Textract merges them into one readable document.
Ready-to-send dispute letters
The app drafts a letter citing the right codes and regulations, ready to sign and send.
One codebase, 3 platforms
Next.js and Capacitor ship one product to web, iOS, and Android, with Stripe and RevenueCat for payments.
HIPAA-ready starter
Authentication came prewired to Convex, Specode's HIPAA-compliant backend, live from week one.
UI components on the shelf
Prebuilt interface components let the team assemble screens fast and restyle them as feedback came in.
Custom AI audit engine
Hathr.ai on Claude catches upcoding, unbundling, duplicates, and math errors, with a confidence score on every flag.
Multi-page document processing
Real bills arrive as photos, PDFs, and scans. AWS Textract merges them into one readable document.
Ready-to-send dispute letters
The app drafts a letter citing the right codes and regulations, ready to sign and send.
One codebase, 3 platforms
Next.js and Capacitor ship one product to web, iOS, and Android, with Stripe and RevenueCat for payments.
The Results
Live on 3 platforms in 4 months
BillDecoder launched as a lean MVP, complete with a back-office admin console, and users started finding money almost immediately.
4mo
Discovery to launch
From kickoff to the app stores
3
Platforms from one codebase
Web, iOS, and Android
<2min
From bill to dispute letter
No account required to start
$1,650 flagged for one user
$1,599 unbundling error caught
$367 in duplicate charges spotted
Savings reported by early BillDecoder adopters.
And the traction is getting noticed: BillDecoder has been named a finalist for Pitch Elk Grove 2026.
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In their words
What the founder is saying
Ready to build your healthcare AI?
Let's turn your idea into a working, HIPAA-compliant product.
The Specode team ships healthtech MVPs that are fast to launch and built to grow.