Varian Medical Systems

Varian Medical Systems is a leading manufacturer of medical devices and software for treating cancer with radiotherapy, radiosurgery, proton therapy, and brachytherapy. Acquired by Siemens Healthineers in 2021, Varian provides the ARIA Oncology Information System (OIS) and developer APIs enabling integration with clinical workflows, EHR systems, and the broader healthcare ecosystem using HL7, DICOM, and FHIR standards.

Varian Medical Systems publishes 11 APIs on the APIs.io network, including AllergyIntolerance API, CarePlan API, Condition API, and 8 more. Tagged areas include Healthcare, Oncology, Medical Devices, FHIR, and Radiation Therapy.

The Varian Medical Systems catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Varian Medical Systems’ developer surface includes authentication, developer portal, documentation, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

37.8/100 thin ▬ flat Agent 35/100 agent ready Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

AccessFreemiumSelf serve⚡ Free to try

12 APIs

Healthcare Oncology Medical Devices FHIRRadiation TherapyHealth IT Fortune 1000

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 37.8/100 · thin

Contract Quality 14.1 / 21

Developer Ergonomics 5.3 / 17

Access Clarity 2.2 / 17

Operational Transparency 0.6 / 11

Contract Governance 1.4 / 10

Discoverability 5.5 / 9

Regulatory Posture 6.4 / 15

Agent readiness — 35/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/varian-medical-systems: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

Open Collections 13

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Rate Limits 1

Documented rate limits and quota policies.

Varian Medical Systems Rate Limits

1 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Examples 2

Example request and response payloads for these APIs.

Scopes 1

OAuth scopes governing access to this provider's APIs.

Varian Medical Systems Scopes

11 scopes · authorizationCode

11 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Varian Medical Systems Agentic Access

16 operations

16 operations · 0 acting

AGENTIC

Press 5

Recent news and press coverage referencing this provider.

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Company 3

The organization behind the API

LinkedIn

Website

Website

Website

Website

Other 4

Properties that don't map to a standard resource type

CapabilityStatement

Product

Standards

Standards

Source (apis.yml)

aid: varian-medical-systems
url: https://raw.githubusercontent.com/api-evangelist/varian-medical-systems/refs/heads/main/apis.yml
name: Varian Medical Systems
tags:
- Healthcare
- Oncology
- Medical Devices
- FHIR
- Radiation Therapy
- Health IT
- Fortune 1000
kind: company
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/varian-medical-systems.png
access: 3rd-Party
created: '2026-05-03'
modified: '2026-05-19'
description: Varian Medical Systems is a leading manufacturer of medical devices and software for treating cancer with radiotherapy,
  radiosurgery, proton therapy, and brachytherapy. Acquired by Siemens Healthineers in 2021, Varian provides the ARIA Oncology
  Information System (OIS) and developer APIs enabling integration with clinical workflows, EHR systems, and the broader healthcare
  ecosystem using HL7, DICOM, and FHIR standards.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
specificationVersion: '0.23'
apis:
- aid: varian-medical-systems:aria-access-api
  name: ARIA Access API
  tags:
  - Healthcare
  - Oncology
  - SOAP
  - Web Services
  - Health IT
  humanURL: https://www.gatewayscripts.com/post/webinars-revisited-a-review-of-aria-apis
  baseURL: https://localhost:55051/Gateway/Service.svc
  properties:
  - url: https://www.gatewayscripts.com/post/webinars-revisited-a-review-of-aria-apis
    type: Documentation
  description: The legacy ARIA Access API provides SOAP and REST access to core ARIA entities including patients, appointments,
    prescriptions, treatment plans, orders, and administrative data. Deployed on-premise within the healthcare institution's
    infrastructure.
- aid: varian-medical-systems:varian-medical-systems-allergyintolerance-api
  name: Varian Medical Systems AllergyIntolerance API
  description: Patient allergy and intolerance records
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - AllergyIntolerance
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-allergyintolerance-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-careplan-api
  name: Varian Medical Systems CarePlan API
  description: Oncology treatment and care plans
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - CarePlan
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-careplan-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-condition-api
  name: Varian Medical Systems Condition API
  description: Cancer diagnoses and clinical conditions
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - Condition
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-condition-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-diagnosticreport-api
  name: Varian Medical Systems DiagnosticReport API
  description: Pathology, imaging, and treatment reports
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - DiagnosticReport
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-diagnosticreport-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-documentreference-api
  name: Varian Medical Systems DocumentReference API
  description: Clinical document management
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - DocumentReference
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-documentreference-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-goal-api
  name: Varian Medical Systems Goal API
  description: Treatment goals and objectives
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - Goal
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-goal-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-medicationrequest-api
  name: Varian Medical Systems MedicationRequest API
  description: Chemotherapy and medication prescriptions
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - MedicationRequest
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-medicationrequest-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-metadata-api
  name: Varian Medical Systems Metadata API
  description: FHIR server capability and metadata
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - Metadata
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-metadata-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-observation-api
  name: Varian Medical Systems Observation API
  description: Labs, vitals, and clinical measurements
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - Observation
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-observation-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-patient-api
  name: Varian Medical Systems Patient API
  description: Oncology patient demographics and identifiers
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - Patient
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-patient-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
- aid: varian-medical-systems:varian-medical-systems-procedure-api
  name: Varian Medical Systems Procedure API
  description: Radiation therapy and other clinical procedures
  humanURL: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  baseURL: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4
  tags:
  - Procedure
  properties:
  - type: OpenAPI
    url: openapi/varian-medical-systems-procedure-api-openapi.yml
  - type: Documentation
    url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  - type: CapabilityStatement
    url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
common:
- type: AgenticAccess
  url: agentic-access/varian-medical-systems-agentic-access.yml
- type: DomainSecurity
  url: security/varian-medical-systems-domain-security.yml
- type: Authentication
  url: authentication/varian-medical-systems-authentication.yml
- type: OAuthScopes
  url: scopes/varian-medical-systems-scopes.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/varian-medical-systems
- name: ARIA FHIR Developer Portal
  url: https://varian.dynamicfhir.com/varian/basepractice/r4
  type: Portal
- name: ARIA FHIR API Documentation
  url: https://varian.dynamicfhir.com/varian/basepractice/r4/Home/ApiDocumentation
  type: Documentation
- name: FHIR Capability Statement
  url: https://varian.dynamicfhir.com/fhir/varian/basepractice/r4/metadata
  type: CapabilityStatement
- name: ARIA API Overview
  url: https://www.gatewayscripts.com/post/webinars-revisited-a-review-of-aria-apis
  type: Documentation
- name: ARIA Oncology Information System
  url: https://cancercare.siemens-healthineers.com/products/software/digital-oncology/oncology-management-systems/aria-oncology-information-system
  type: Product
- name: Varian Website
  url: https://www.varian.com
  type: Website
- name: Siemens Healthineers Cancer Care
  url: https://cancercare.siemens-healthineers.com
  type: Website
- name: HL7 FHIR Standard
  url: https://hl7.org/fhir/R4/
  type: Standards
- name: DICOM Standard
  url: https://www.dicomstandard.org
  type: Standards

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Varian Medical Systems

APIs 12

Open Collections 13

Pricing Plans 1

Rate Limits 1

FinOps 1

Semantic Vocabularies 1

Spectral Rules 2

JSON Schema 1

JSON Structure 1

Examples 2

Security Posture 2

Scopes 1

Agentic Access 1

Press 5

Telix Pharmaceuticals Enters Strategic Collaboration with ...

Varian Medical Systems Invests in COTA, Inc. to Help Drive ...

Siemens Healthineers completes acquisition of Varian ...

Varian Medical Systems

AI-Enabled Radiation Therapy System & 1,000th Patient

Get Started 1

Documentation 2

Agent Surfaces 1

Access & Security 3

Company 3

Other 4

Source (apis.yml)

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