On June 3, 2026 Lassie raised $35 million to help medical practices avoid paperwork.
For most doctors outside of concierge medicine a large portion of their work load is dedicated not to care but rather to medical billing. This is a pain point many young doctors don't realize even exists until they begin running their own practice. Medical billing accounts for over $1 Trillion in annual revenue [4][5]. While experts debate the exact number it is estimated that over 10% of GDP in the US comes from medical billing. [5]
Lassie is a startup building an artificial intelligence (AI) agent that does the back-office paperwork at small practices. The Series A round was led by Andreessen Horowitz (a16z), bringing its total funding to $47 million [1].
What Lassie Actually Does
Lassie's AI agent logs into a practice's insurance portals, pulls reimbursements, reconciles them against the practice's records, posts the result to the ledger, verifies that the funds actually landed in the bank, and flags the claims that need a human to step in [1][2]. The company is careful about the distinction it is drawing. Most AI tools are "copilots" that draft something for a person to check, which can create more review work. Lassie says its agent does the work itself, end to end [2].
A typical practice loses more than 100 hours a month to administrative work and spends roughly $200,000 a year on billing related staff who are increasingly hard to find and keep, according to Lassie [1].
Doctors' offices are the largest category of small business in the US after retail and food and beverage, which is a lot of practices losing a lot of hours to paperwork [1].
Lassie says it now operates in more than 700 practices across 49 states, generates over $10 million in annualized revenue, and gives business owners back more than 250,000 hours of labor a year, with most of that growth coming from owners referring other owners [1][2]. Customers tell the company the biggest win is not speed; it is catching the underpayments, denials, and missing claims that used to slip through [2].
Who Built Lassie
Lassie was founded by Steijn Pelle, its chief executive, and Frédéric Renken [1]. Neither came from healthcare. Pelle was an early product manager at the trading app Robinhood and at the crypto exchange Coinbase; Renken was the first product hire at the email startup Superhuman and earlier built product at Uber [1][2]. The company they built is backed not just by a16z but by a roster of operators who have run exactly these kinds of companies: Rahul Vohra of Superhuman, Zach Perret of Plaid, Taavet Hinrikus of Wise, and Brian Balfour of Reforge all joined the round, alongside SV Angel, Homebrew, and Go Global Ventures [1].
The origin story is unusually hands-on. Pelle learned how tangled a dental practice's finances are from his own dentist, Dr. Kwon [2]. Rather than guess at the workflow, he and Renken went into Dr. Kwon's office and processed payments by hand to understand it from the inside [2]. Before writing a line of code, the founders spent months talking to dentists, primary care doctors, and healthcare finance teams, then spent years building the integrations an agent needs to operate inside a real practice's systems [2]. a16z's Alex Rampell, a co-founder of the payments company Affirm, is joining Lassie's board; Dr. Ed Zuckerberg and former Robinhood finance chief Jason Warnick are joining as advisors [1].
Why This Matters Beyond Dental
Lassie chose dental first because the pain is sharp and the workflows are repetitive and structured, which is exactly what an AI agent handles well [2]. But the founders have been clear that dental is a starting point, not the destination. The thesis is that every small business is still held together by people answering phones, chasing paperwork, collecting payments, and reconciling accounts, and that AI agents can take that work over [2]. The first market is doctors' offices; the rest of medicine is the obvious next stop, which is why the founders were talking to primary care doctors before they ever shipped [2].
That is the same shift we have been tracking across health technology. We have written about Commure raising $70 million to automate medical billing with AI, and Lassie is another company aiming at the same overhead from a different angle. The pattern is consistent: the administrative load that makes independent practice feel impossible is being absorbed, piece by piece, into software that does the work instead of just organizing it.
For the physician-led practices NextMD exists to help patients find, that pattern is good news. The single biggest barrier to staying independent, or to running a concierge or direct primary care (DPC) practice on a flat membership fee, is administrative overhead. The math is worth sitting with: direct primary care keeps prices low precisely because it strips insurance billing out of the practice entirely, charging a flat $50 to $200 a month instead of running claims. Lassie comes at the same problem from the opposite direction, automating the billing instead of removing it. Either way, the overhead that pushes doctors into big hospital systems gets smaller, and the independent, physician-led practice gets easier to sustain.
The Limits Worth Naming
A few caveats keep this honest. Lassie is a dental company today; the leap to medical billing, with its different payers, codes, and rules, is real work it has not yet proven at scale. Its strongest, most specific claims, including the 700 practices and 250,000 hours, come from the company and its lead investor, not an independent audit. And an agent that handles the money does not touch the part of medicine that matters most to a patient: the time a doctor spends actually listening. What it does is clear away the busywork that eats into that time. As Dr. Kwon put it, the real payoff was getting hours back to focus on patients and grow the practice [1].
For patients, the takeaway is simple. The independent, doctor-owned practices that give you a real appointment instead of a rushed 15 minutes are getting cheaper and less painful to run. That should mean more of them survive, and more of them open. The job left to you is finding the one near you.
FAQ
What is Lassie?
Lassie is a startup building an AI agent that handles the back-office administrative work at small practices, starting with dental offices. Its agent pulls insurance reimbursements, reconciles payments, posts them to the ledger, and flags claims that need attention [1][2].
How much did Lassie raise, and who led the round?
Lassie raised a $35 million Series A led by Andreessen Horowitz on June 3, 2026, bringing total funding to $47 million [1].
Does Lassie work with medical practices or just dental?
Today Lassie operates in dental practices, more than 700 of them across 49 states. Its founders have said dental is the starting point and have spoken with primary care doctors, but medical billing is not yet its proven market [1][2].
Why does this matter for concierge and direct primary care?
Administrative overhead is the main cost of running an independent practice. Tools that automate billing and paperwork make small, physician-led concierge and DPC practices cheaper to run and easier to keep open.
Find a Doctor Who Has Time for You
Software that clears the paperwork off a practice only helps you if it leads to a doctor who has time to listen. NextMD is the free directory of concierge and direct primary care doctors across the country. Search NextMD to find a physician-led practice near you.
Sources
Lassie. (2026). Lassie Raises $35M Led by Andreessen Horowitz to Build AI for Small Businesses to Run Themselves. BusinessWire. Read the announcement on BusinessWire
Rampell, A., & Moore, O. (2026). Investing in Lassie. Andreessen Horowitz. Read on a16z
Fierce Healthcare. (2026). Fierce Healthcare Fundraising Tracker '26. Read on Fierce Healthcare