Heidi raises $340M to enhance AI tools for healthcare

Heidi Health, an Australian AI startup that automates the paperwork side of being a doctor, just closed a $340 million funding package that values the company at $900 million. The round, announced September 22, 2026, combines a $100 million Series C equity raise led by Blackbird Ventures with a $240 million growth investment from General Catalyst’s Customer Value Fund. That’s a near-doubling from its $465 million valuation just last October, when Heidi closed a $65 million Series B.

What Heidi actually does

At its core, Heidi is an AI scribe. It listens to doctor-patient conversations and automatically generates clinical notes, working in over 110 languages. The company is expanding into what it calls “AI Care Partner” agents: supervised tools that can handle patient communication and information lookup, all under clinician oversight.

The platform is already deployed in major health systems. Beth Israel Lahey Health in the US and NHS England Midlands in the UK are among the institutional clients.

Growth that speaks for itself

Heidi’s traction numbers tell a clear story. The platform now processes 2.8 million patient visits per week across more than 116 countries. The company was founded in 2021 in Melbourne by Dr. Thomas Kelly, Waleed Mussa, and Yu Liu.

Going from $1 million to $50 million in annual recurring revenue over a two-year span puts Heidi in rare company among enterprise SaaS startups. Much of that growth reportedly came through word-of-mouth among clinicians.

Dr. Simon Kos, formerly the Chief Medical Officer at Microsoft, joined as Heidi’s CMO during the Series B round. Heidi has also named Toronto as its North American headquarters, backing the decision with a $25.4 million CAD investment.

The bigger picture for healthcare AI

Doctors in the US spend roughly two hours on administrative tasks for every hour of direct patient care. Heidi’s approach automates documentation rather than clinical decision-making, while the expansion into supervised AI agents adds more capability without removing the human from the loop.

Companies like Ambience Healthcare, Abridge, and Nuance (owned by Microsoft) are all competing in the same space. Heidi’s international scale — processing nearly 3 million patient visits weekly across 116 countries — gives it a data advantage that newer entrants will struggle to match.

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