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Horizon Population Health API

AI-powered analytics — natural language querying, risk stratification, predictive models

OpenAPI SpecQuery playground

Live API Status — Horizon Analytics

Probing production endpoints…

Rate Limits & SLA

Rate limit

500 queries/min

Burst

50 req/sec

Uptime SLA

99.9%

Support

Business hours · 4h

P95 latency

< 2s semantic

Retention

Query logs 90d

Natural Language Query

Translate questions into SQL against the FHIR data lake. "How many diabetic patients have A1C above 9%?"

Risk Stratification

Admission risk, readmission risk, ED utilization, and mortality prediction scoring.

Quality Measures

HEDIS, CMS Star Ratings, and custom quality measure calculation.

Natural Language Query Example

Request

POST /horizon/v1/query/nl
Authorization: Bearer {token}

{
  "query": "How many diabetic patients have
   an A1C above 9% in the last 6 months?",
  "max_rows": 100
}

Response (200 OK)

{
  "sql": "SELECT COUNT(DISTINCT p.gpid) ...",
  "result": {
    "columns": ["count"],
    "rows": [[ 847 ]],
    "total_rows": 1
  },
  "explanation": "Found 847 patients with
   Type 2 Diabetes (E11.x) and most recent
   HbA1c (LOINC 4548-4) > 9.0%",
  "execution_time_ms": 1240
}

Query playground

Two-step NL → execute flow against the sandbox gateway. Requires a bearer token with horizon.query scope.

OpenAPI spec

Horizon Portal (11 Pages)

Dashboard
Risk Stratification
Quality Measures
Care Gaps
Provider Performance
Financial Analytics
Predictive Models
War Room
Reports
Settings
Alerts

Horizon API Endpoints

POST
/horizon/v1/query/nlBearer

Natural Language Query

1200ms/3500ms20/min200
POST
/horizon/v1/query/executeBearer

Execute SQL Query

800ms/2500ms30/min200
POST
/horizon/v1/scoreBearer

Risk Stratification Score

500ms/1500ms10/min200

Integration toolkit

SandboxAPI PlaygroundOpenAPI Try-it-outCertificationWebhooks
Postman collection (14 requests)Import the same JSON into Insomnia

Official SDKs

Generate TypeScript client →·Python →·All SDKs

Apex Horizon certification track

12 required items · platform + product-specific checks

Full checklist →
  • First authenticated API call in sandbox
  • OAuth or API key with least-privilege scopes
  • FHIR R4 read against sandbox lake
  • GPID boundary headers on write paths
  • Webhook HMAC-SHA256 verification implemented
  • Webhook idempotency by delivery ID

+9 more on the certification page

Complete all required items before production go-live