K Health vs Lumeris Tom (2026)
K Health's PatientGPT waits where patients already go. A health system puts it on its website, phone line and portal under its own name; when a patient writes in, it answers from that patient's record, gathers the history a clinician would want and books the visit that fits. The health system's own policy sets the routes and when a nurse steps in, and an automated reviewer records a pass or fail with a reason for each conversation. Atlantic Health runs it in MyChart. Lumeris Tom goes looking for patients instead. Lumeris's Best Next Action engine scans claims, records from more than 119 EHR pipelines, labs and hospital events for every patient in a value based contract, decides who needs a screening, a wellness visit or a check after discharge, and Tom's agent makes the call or sends the text. Its symptom checks follow Schmitt-Thompson nurse triage content and finish by flagging a priority to clinicians. Lumeris sells Tom with its contracting and coaching services, often sharing risk. So the choice is between answering demand and creating it. K handles the questions patients bring, and a 2025 study of 461 visits at Cedars-Sinai, published in Annals of Internal Medicine, backs its clinical engine, though not the patient conversations. Tom works the population list, with savings figures from Lumeris's partnerships and a claim that it ensures nothing gets missed. Neither publishes a price or names a security certification, and neither states a regulatory position for its symptom questions, though Tom's follow a named triage protocol. A health system modernizing access will look at K; an organization taking risk for a primary care population will look at Lumeris.
- Patients reach the same assistant on the website, phone line and portal, and the conversation follows them from one channel to the next.
- Dynamic Intake takes the history a clinician would ask for and sends the summary ahead of the visit it books.
- An automated Supervisor and Judge records a pass or fail, the policy clause and a reason for each conversation, giving the health system an audit trail.
- In the 2025 Cedars-Sinai study in Annals of Internal Medicine, K's clinical engine held back a recommendation in about one visit in five when it was not confident.
- Outreach is picked by the engine, which reorders each patient's next step whenever new claims, lab results, prescriptions or admissions come in.
- Calls and texts cover screening reminders, annual wellness visits, checks after discharge and medication follow up between visits.
- Symptom checks use Schmitt-Thompson triage content, long used by nurse call centers, and hand the care team a summary with a priority.
- Lumeris brings 15 years of value based primary care work and runs its own Medicare Advantage plan, Essence Healthcare.
This comparison is published by AI Health Index, an independent research platform that compares healthcare AI vendors objectively. K Health and Lumeris Tom are each graded against the same capability taxonomy, from each vendor's own public materials and the regulatory record, under the AI Health Index verification standard. No vendor pays for placement, and no vendor has reviewed this page. How this evidence is graded
Plain facts
| Fact | K Health | Lumeris Tom |
|---|---|---|
| Primary category | Patient Voice Agents | Patient Voice Agents |
| Founded | 2016 | 2010 |
| Headquarters | New York, New York, United States | St. Louis, Missouri, and Cambridge, Massachusetts, United States |
| Website | khealth.com | lumeris.com |
Side by Side
Select any grade to read the note behind it.
Each vendor in one paragraph
Written to be quoted whole. Each paragraph states what the AI Health Index verified about the vendor, with the caveats attached.
K Health's PatientGPT is an AI assistant that health systems run under their own brand on their websites, phone lines and patient portals, answering patients from their records, taking histories and booking care under each system's own policy, with an automated reviewer auditing every conversation. Live sites include Atlantic Health inside MyChart, and K also supplies its own physicians for 24/7 virtual care. A 2025 Cedars-Sinai paper set its clinical engine's recommendations against doctors' own decisions in 461 virtual urgent care visits. The gaps sit in the conversations themselves, which have no published error rate and steer patients to a level of care without a regulatory position, and in the paperwork, with no price, security certification or business associate terms published.
Source: AI Health Index, November 2026
Lumeris Tom is an outreach and prioritization platform that Lumeris, a St. Louis value based care company and Medicare Advantage plan operator, provides to hospital networks, doctor groups and insurers in its primary care partnerships. Best Next Action decides which patient needs what next from claims, records, labs and hospital admissions, and Tom's agent then calls or texts, runs symptom checks and passes summaries to the care team. By Lumeris's count the platform covers more than 1.4 million lives and has taken in $90 billion in claims. Less is published about Tom itself, since Lumeris claims it ensures nothing gets missed without a figure, its outcome numbers describe its partnerships, and no price, HIPAA terms or security certification are given for Tom.
Source: AI Health Index, November 2026
Questions buyers ask
How does K Health compare with Lumeris Tom?
K Health and Lumeris Tom both use AI to talk with patients for health systems, from opposite directions. K Health's PatientGPT answers patients who reach out through a health system's website, phone line or portal, and books their care. Lumeris Tom reaches out to patients itself, choosing whom to contact from claims and clinical data inside a value based care partnership with Lumeris. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified November 7, 2026. No vendor pays for placement.
Do K Health and Lumeris Tom triage patients?
Both sort patients by urgency in some conversations. K Health's PatientGPT steers patients to the right level of care under each health system's policy, and in its demo it tells a parent that a feverish four year old should be seen the same day. Lumeris Tom checks symptoms by following Schmitt-Thompson's licensed nurse triage guidelines and gives the care team a suggested priority. Neither K Health nor Lumeris states a regulatory position for this work. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified November 7, 2026. No vendor pays for placement.
How much do K Health and Lumeris Tom cost?
Neither K Health nor Lumeris publishes a price. K Health sells PatientGPT to health systems as an enterprise deployment, sometimes with its staffed virtual care, and offers sandbox access for testing. Lumeris sells Tom as Primary Care as a Service, often packaged with value based care enablement in which it shares risk with partners, and how Tom itself is charged is not stated. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified November 7, 2026. No vendor pays for placement.
What evidence is there for K Health and Lumeris Tom?
K Health's clinical engine was tested in a 2025 Cedars-Sinai paper in Annals of Internal Medicine, in which physicians rated its recommendations against what treating physicians actually did in 461 virtual urgent care visits from June and July 2024; PatientGPT's patient conversations have not been studied. Lumeris reports savings of more than $100 per member per month and 94 percent quality scores for its Medicare partnerships, without method, and no study measures Tom itself. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified November 7, 2026. No vendor pays for placement.
Where does Hippocratic AI fit next to K Health and Lumeris Tom?
Hippocratic AI charges hourly for its agents, between $2.50 and $15 an hour at its floor rates depending on the Polaris 6.0 model, for work such as medication adherence calls, intake and trial enrollment, and sells to providers, health plans and drug makers. Unlike K Health's single branded front door or Lumeris Tom's partnership model, the buyer picks the programs.
Hippocratic reports how clinicians judged every model release, holds HITRUST e1, and keeps its agents out of diagnosis and prescribing. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified November 7, 2026. No vendor pays for placement.
Related comparisons
Other published head to head assessments involving these vendors or their closest peers. The full set for this category is on the Patient Voice Agents page.
Neither vendor publishes a price, a security certification, terms for handling patient data as a business associate, or any breakdown of results by patient group. K Health operates as a covered entity for its own care under a joint notice of privacy practices, while PatientGPT's terms inside a health system are not stated, and no error rate is published for its patient conversations. Lumeris publishes no HIPAA position for Tom, and the savings it reports come from its partnerships as a whole, not from Tom alone.
Ask K Health what its business associate agreement covers and which conversations PatientGPT resolves without a nurse.
Ask Lumeris how it would show that Tom misses no one, what patients hear during a symptom check, and what agreement governs the claims and records Tom uses.