φ(ai) PHI AI
Menu
Clinical workspace
Patients & charts PHI AI assistant Signature queue Ambient documentation Imaging worklist Summarization Inbox triage Patient instructions
Revenue & records
Claims & billing Prior auth & appeals Documentation gaps Release of information Sensitive categories
Population
Cohort builder No-show risk Scheduling optimization Trial pre-screening Quality measures
Data Orchestration
Orchestration Connected systems Patient link set Practitioner crosswalk Permission lattice What each system holds Run ledger Ingest & mapping QA Data Store
System
Control panel Model monitoring Components
Governance
Registry & preflight Fairness screen Ambient consent gate Source attributes Retention Audit
Documentation
System documentation Implementation & setup guide Feature documentation Model documentation System architecture EMR connections Orchestration & identity Emulators & non-PHI setup Compliance & responsibility Attribution

Cohort builder

Population counting over the Data Store. A cohort is any combination of the variables below — a condition, sex, an age band, a payer — and each one alone is a cohort; nothing set is all persons. Counts are distinct persons, never diagnosis rows, and each count is recorded in the audit trail before it runs.

applies as you change it · COUNT(DISTINCT patient_id) · recorded before it runs
33,311
distinct persons — all persons
33,311
total patients — the denominator a zero is read against

COUNT(DISTINCT patient_id) — a patient diagnosed at four visits is one person, not four. In the deployable platform this runs over the OMOP CDM layer under a SELECT-only role.

charts of every population metric for this cohort — all persons — beside everyone's

Cohort composition — counts, never lists

DimensionGroupPersons
sex female 16,912
sex male 16,399
payer Blue Cross Blue Shield 5,852
payer Medicaid 5,847
payer UnitedHealthcare 5,563
payer Medicare 5,332
payer Aetna 4,468
payer Cigna 3,968
payer Humana 2,281

Cells under 11 report as a bounded range — small-cell suppression on the analytics plane, standard de-identification practice — and in a complete breakdown the smallest neighbour is withheld with them, so nothing comes back by subtraction.

Population

33,311
Patient charts
33,311 the platform's own — nothing moved yet this visit
16,912
female
16,399
male