ThetaRho is a Santa Clara, California company building AI infrastructure for healthcare data. Its platform ingests fragmented clinical data - EHR records, faxed PDFs, scanned images, CCDA documents, HL7 messages and free-text notes - de-duplicates patient records and outputs standardized FHIR R4 resources. An AI layer on top turns that normalized data into queryable clinical knowledge using semantic search, medical ontology mapping and grounded LLM question answering with source citations. The company sells the result as APIs and infrastructure to developers and health systems, and as finished clinical applications to physicians.