Carta Healthcare vs Layer Health (2026)
Chart abstraction for quality programs is the shared task for Carta Healthcare and Layer Health. Both offer software and clinical staffing options; Carta emphasizes supported review alongside existing submission tools, while Layer describes a progression toward automated submission for validated fields. Carta's Lighthouse proposes answers with chart excerpts, original documents and registry coding instructions available to the abstractor. Voyager supplies ingestion and AI processing through read only FHIR connections, while Navigator adds analytics. Hospitals can keep their own staff or buy abstraction services. Named experiences establish operational use, but combined service outcomes do not isolate the performance of today's Lighthouse software. Layer Health suggests answers with supporting chart evidence across cardiovascular, surgical, oncology and other registries. Customer abstractors establish reference data and validate performance before launch; fields can move to automated submission after meeting required thresholds. Clinical staff can handle the transition. Its call to trust every data point goes beyond the reported imperfect accuracy, which comes without field counts or a registry breakdown. Both support quality abstraction at scale, with costs depending on the scope of software, services and integration. Carta fits registry teams wanting evidence assisted abstraction while retaining existing submission workflows and a choice of staffing support. Layer fits health systems planning a staged move from staff validation toward automated field submission.
- Abstractors should review answers beside registry coding instructions.
- Existing registry submission tools should remain in use.
- Read only EHR access is a desired boundary.
- The hospital wants software with optional abstraction personnel.
- The deployment should progress toward validated field automation.
- Customer data should establish a reference before launch.
- Clinical services should support the transition to automation.
- Several registry programs need a common abstraction platform.
This comparison is published by AI Health Index, an independent research platform that compares healthcare AI vendors objectively. Carta Healthcare and Layer Health 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 | Carta Healthcare | Layer Health |
|---|---|---|
| Primary category | Clinical Summarization & Chart Review | Clinical Summarization & Chart Review |
| Founded | 2017 | 2023 |
| Headquarters | San Francisco, California | Boston, Massachusetts |
| Website | carta.healthcare | layerhealth.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 opens the AI Health Index profile of the vendor: what the product is, who buys it and what it does.
Carta Healthcare supplies software and clinical abstraction services for hospital registry teams. Lighthouse reads patient records and proposes answers to registry questions, with supporting passages and links to the original clinical documents. Abstractors inspect that evidence and confirm the answer while keeping the registry sponsor's coding instructions beside the question.
Source: AI Health Index, October 2026
Layer Health is a Massachusetts Institute of Technology spin out, founded in 2023 and based in Boston, applying large language models to clinical chart review. Its chief executive is David Sontag, an MIT professor of machine learning in healthcare, with co founders Monica Agrawal, Luke Murray and Divya Gopinath and physician informatician Steven Horng.
Source: AI Health Index, October 2026
Questions buyers ask
How are Carta Healthcare and Layer Health priced and sold?
For Carta Healthcare, a separate annual Fivos OpenPathways API subscription can also apply, so the technology and registry connection are distinct cost components. The purchasing structure is understandable before contact, though a hospital cannot yet see current volume bands, minimum commitments, or its full price.
With Layer Health, the registries page offers three models: AI native software used by the health system's own abstractors, AI transitionary services in which the company's clinical experts do the abstraction on the platform until fields qualify for automated submission, or a mix by registry; implementation runs from contracting to go live in ten weeks or less. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified October 15, 2026. No vendor pays for placement.
How do Carta Healthcare and Layer Health handle patient data?
In Carta Healthcare's case, the workflow returns evidence to an abstractor for validation, rather than automatically changing the EHR.
For Layer Health, the home page says the AI improves with every piece of feedback, and the chief executive has described the models as trained on longitudinal patient data, so whether one health system's charts or abstractor corrections improve models another uses, and how long charts read in bulk persist, are unanswered. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified October 15, 2026. No vendor pays for placement.
What evidence is published for Carta Healthcare and Layer Health?
With Carta Healthcare, a dated, reproducible evaluation of today's software alone remains unavailable.
In Layer Health's case, the registries page describes the method: abstractor time per case is baselined in the current workflow and ground truth established before the AI is switched on. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified October 15, 2026. No vendor pays for placement.
How much do Carta Healthcare and Layer Health leave to the clinician?
For Carta Healthcare, the person confirms the answer and resolves ambiguous clinical documentation. Voyager uses read only EHR access and does not write changes into the patient record, which limits the actions the model can take in that system.
With Layer Health, the customer's abstractors validate the model on their own data before go live; answers arrive as suggestions with the chart evidence behind them; and fields move to automated submission only when validation reports show they meet a required threshold, with the company's own abstractors available to run the work in the meantime. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified October 15, 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 Clinical Summarization & Chart Review page.
Carta Healthcare is based in San Francisco and Layer Health in Boston. Neither has a public complete deployment price. Carta's Fivos arrangement can include a separate API subscription; Layer gives no values for its automated submission thresholds.