Bunkerhill Raises $55M to Expand Agentic AI in Hospitals

Bunkerhill Health closed a $55 million Series B to scale Carebricks, its platform for building and running agentic AI against live clinical data. The round includes follow-on investment from Sequoia Capital, Felicis, Optum Ventures and Y Combinator, with Khosla Ventures joining as a new investor. The company announced the financing as it works to expand deployments inside health systems.

Carebricks is designed to let hospital departments create and operate AI agents that run on patient records and administrative systems. The company markets the platform for clinical tasks such as image review and follow-up flags, and for administrative work such as prior authorization and registry maintenance. Bunkerhill says the platform is intended to move models from research environments into production workflows at institutional scale.

Several large health systems use the platform. Cleveland Clinic, the University of Texas Medical Branch and Intermountain Health are named customers. UTMB reports more than 20 live agents across clinical care, operations and administration. One coronary calcium detection agent built on an FDA-cleared algorithm flagged a patient as being at imminent risk of a heart attack during its first month of use; cardiology confirmed the risk and the patient underwent a triple bypass. UTMB attributes the early detection to the agent’s alert.

UTMB provided operational figures from its live deployments. A nephrology triage agent that prioritizes patients by severity and routes lower-acuity cases to telemedicine is reported to have cut average specialist wait times by more than 50 percent. A lung nodule agent that tracks incidental CT findings is reported to have produced an 80 percent faster response on urgent cases, doubled guideline-concordant follow-up and reduced manual coordinator work. Those results are drawn from Bunkerhill and UTMB internal reports; Bunkerhill has not published independent, large-scale performance data or false-positive rates across patient populations.

Nishith Khandwala, co-founder and CEO, said, “Medicine has advanced faster than our healthcare system’s ability to operationalize it. Every leading health system has more opportunities to improve patient outcomes than its workforce has capacity to address.” Vinod Khosla, founder of Khosla Ventures, described the main barrier as adoption rather than technology and praised the company for gaining traction inside health systems.

Bunkerhill plans to use the funding to expand Carebricks into additional clinical and operational use cases and to add governance, monitoring and safety features. The platform allows individual departments to build and tune their own agents, which places responsibility for outcomes on those departments. Health system boards and executives evaluating a rollout will need clear policies on liability assignment, monitoring cadence and procedures for resolving disagreements when an agent’s recommendation differs from a clinician’s judgment.

UTMB’s deployment provides a live reference case for running multiple agents in production. Bunkerhill emphasizes live production use rather than synthetic benchmarks as its main approach. The company and participating systems plan to continue expanding agent use while developing governance and oversight practices as the number of live agents grows.