PHI-Safe Clinical AI

The Warden:
PHI-Safe AI for Healthcare

A HIPAA-aware privacy and governance layer for clinical AI workflows, designed to prohibit LLM exposure to patient-identifying data while keeping AI useful, auditable, and policy-aware.

The Use Case

Why clinical AI needs PHI exposure prevention built in from the start.

The Problem

Healthcare organizations want to leverage generative AI platforms like OpenAI, AWS Bedrock, and Google Gemini to analyze complex clinical notes, extract insights, and assist doctors.

But PHI exposure risk makes ordinary AI workflows difficult to approve, govern, and trust in real clinical settings.

The Solution

The Warden creates a PHI-safe AI boundary, helping teams use clinical intelligence while prohibiting patient-identifying data from reaching the model.

It also adds AI request guardrails, policy enforcement, and audit-ready governance, so clinical users can receive useful answers without exposing PHI to the model.

Security Controls

How the Warden turns clinical AI into a secure, HIPAA-aware workflow.

1. PHI Exposure Prevention

Patient-identifying information is prohibited from model exposure while the workflow preserves enough clinical context for useful reasoning.

2. AI Request Guardrails

AI requests are screened against safety policies to reduce prompt injection risk, block unauthorized data access, and keep clinical workflows within approved boundaries.

3. Audit-Ready Governance

AI decisions and governance events are captured in a PHI-conscious audit trail, giving teams visibility without turning logs into a liability.

Federal Compliance Frameworks

Security controls aligned with NIST and HIPAA priorities.

NIST AI RMF

Map, Measure, Manage: The Warden helps teams identify AI risks, apply request-level guardrails, and support governance reviews with evidence.

NIST SP 800-53

Audit & Access Controls: Supports auditability and least-privilege design by tracking governance decisions while minimizing sensitive data exposure in logs.

HIPAA Security Rule

Technical Safeguards: Designed around HIPAA Security Rule safeguards (§164.312), including controls that prohibit PHI from being read by the LLM.