Primary care, behavioral health, and social services - delivered together, to the Medicaid members the system usually routes around.
Somewhere in the Bronx this morning, a Cityblock care team knocked on a door. Not a clinic door - an apartment door. Inside is a member with diabetes, a history of missed appointments, and an eviction notice taped to the fridge. The medical chart says "non-compliant." The care team knows better: you cannot manage blood sugar from a shelter. So before anyone mentions insulin, they talk about the housing. This is Cityblock Health on an ordinary Tuesday.
Cityblock is a healthcare company built for the people other healthcare companies quietly find unprofitable - low-income Medicaid recipients and the "dually eligible" who qualify for both Medicaid and Medicare. It treats medical, behavioral, and social needs as one tangled problem, because for its members they are. The company now reaches more than 100,000 of them across over ten states, and it gets paid to keep them well rather than to bill them when they break.
"Deliver radically better care to those who need it most."
American healthcare has a strange habit: it spends the most money on the people it serves the worst. A small slice of patients - often poor, often juggling chronic illness, mental health, and unstable housing - drives an outsized share of hospital and emergency costs. The fee-for-service system happily bills for each crisis. It is far less interested in preventing the next one.
The founders had watched this up close. The market treated complex, low-income patients as a cost to be contained. Cityblock's contrarian read: those same patients were an opportunity, if you actually built a model around them instead of bolting them onto one designed for someone else. The irony was hard to miss - the "hardest" patients were hard mostly because nobody had bothered to design for them.
"We treat the whole person - their medical, behavioral, and social needs together, in the neighborhoods where they live."
Cityblock began in 2017 as an unlikely export from Big Tech - a spin-out of Sidewalk Labs, Alphabet's urban innovation group. The premise printed on the founding flag: rebuild urban health "one block at a time." Co-founders Toyin Ajayi and Iyah Romm had run care for complex populations at Commonwealth Care Alliance; co-founder Bay Gross brought the technology spine. Ajayi, a physician who started on the front line, is now CEO.
Their bet was almost embarrassingly simple and almost nobody was making it: hire trusted, neighborhood-based teams, give them real software, take financial risk on whether members actually got healthier, and let the savings fund the care. The hard part was not the idea. The hard part was being willing to be measured on it.
Physician-leader; former Chief Medical Officer at Commonwealth Care Alliance.
Founding CEO; former Chief Transformation Officer at Commonwealth Care Alliance.
Brought the data and technology foundation from the Sidewalk Labs roots.
FIG. 2 - Three founders, one stubborn idea: the people the system finds "too complicated" were the entire business plan.
Cityblock is not an app, and it is not a hospital. It is a wrap-around care model run by interdisciplinary teams - doctors, behavioral health clinicians, social workers, and community health partners - backed by a custom platform called Commons that handles risk stratification, coordination, and 24/7 outreach. Visits happen wherever the member is: a hub, a couch, a phone screen.
Longitudinal, neighborhood-based primary care, including in-home and virtual visits.
Mental health and substance-use support woven directly into primary care, not siloed off.
Help with housing, food, transportation, and benefits - the things that actually move outcomes.
Proprietary software for risk scoring, care coordination, and round-the-clock outreach.
Expanded long-term services and supports for members with the most complex needs.
Risk-sharing with health plans - Cityblock wins when members stay well and out of the ER.
"You cannot manage someone's blood sugar from a homeless shelter. So we start with the shelter."
The spin-out. Cityblock launches out of Alphabet's Sidewalk Labs with a mission to rebuild urban health one block at a time.
Series A. ~$20.8M led by Maverick Ventures, with Thrive Capital and Sidewalk Labs.
Series B. ~$65M to scale neighborhood care teams and the Commons platform.
Series C. $160M led by General Catalyst as the model proves out.
Series D - $400M. Backed by SoftBank's Vision Fund 2 and Tiger Global; valuation reported above $5.7B. First CNBC Disruptor 50 nod.
Evidence & expansion. Study shows ~20% lower inpatient use for severe mental-health Medicaid patients; new payer partnerships in NY, OH, FL, NC.
Next chapter. Launches expanded LTSS offering, adds a new CTO and board members, and publishes a report on AI in Medicaid care.
A nice mission is cheap. Health plans do not write risk-sharing contracts for nice missions; they write them for results. Cityblock's case rests on data it has been willing to publish, and on the roster of payers that keep signing up.
FIG. 3 - Charts rarely capture a home visit. But payers read charts, and these are the ones that get a contract signed.
"A study found Cityblock's program cut inpatient utilization nearly 20% for severe mental-health patients on Medicaid."
Multiple value-based partnerships across states - including central Florida and Illinois.
2025 alignment to serve Medicaid members in Ohio.
Comprehensive care for Medicaid members in New York.
2026 partnership to serve 10,000 Medicaid members.
Plenty of companies put "health equity" on a slide. Cityblock put it in the contract. By taking financial risk on Medicaid members - the population most likely to be written off - it tied its own survival to whether marginalized people actually get better. That is a less comfortable place to stand than a mission statement, and a more honest one.
The model insists on something the industry keeps forgetting: trust is clinical infrastructure. A community health worker who shares a member's language and zip code can do what no portal can. Cityblock built its software, Commons, to serve that relationship rather than replace it - technology in the back seat, the human in front.
"The hardest patients were hard mostly because nobody had bothered to design for them."
Medicaid covers roughly one in five Americans. As budgets tighten and the dually eligible population grows, the question Cityblock was built around stops being optional: can you actually care for the most complex, lowest-income patients without going broke - or worse, without quietly giving up? In 2026 the company is pushing into long-term supports and staking out a position on how AI should be used in this work. The bet is widening.
Back in that Bronx apartment, the eviction notice is the first thing the team addresses, not the last. The insulin conversation comes after - and it lands differently when the member is not about to lose the fridge it's stored in. Nothing about that is dramatic. It's just care, arranged in the right order, for someone the system had filed under "non-compliant." Cityblock's wager is that if you keep doing this, one door at a time, the charts eventually agree.
"Rebuild urban health - one block at a time."