aid: ellkay
name: ELLKAY
description: >-
  ELLKAY is a healthcare data interoperability and data-management company that connects
  disparate health IT systems so clinical and financial data can move where it is needed.
  Its LKOpera, LKOrbit, and LKOasis product lines provide interface-engine integration,
  orders and results, payer data retrieval, network/lab connectivity, and data
  archiving/migration across 750+ EMR/PM systems, 400+ hospitals, 58k+ practices, and 725+
  laboratories. For developers, ELLKAY exposes the LKCloud platform: a single-endpoint Interop
  API (proprietary LK* operations) and a full HL7 FHIR R4 RESTful API, both authenticated with
  OAuth 2.0 against the LKIdentity authorization server and routed with a SiteServiceKey.
url: https://raw.githubusercontent.com/api-evangelist/ellkay/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- insight-partners
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/68470d9028f4a074323fde70/689b3ac60177b4bae93d407b_Asset%2028.png
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Healthcare
- Interoperability
- FHIR
- HL7
- EHR Integration
- Health Data
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: LKCloud Interop API
  description: >-
    Single-endpoint healthcare interoperability API exposing proprietary LK* operations
    (appointments, patient bridge/search, documents, charges, patient balance, master lists)
    that bi-directionally connect applications to hundreds of EHR/PM data sources. JSON over
    HTTPS, invoked as POST operations; OAuth 2.0 Bearer + SiteServiceKey.
  humanURL: https://lkcloud-api.readme.io/docs/lk-cloud-overview
  baseURL: https://services.lkcloud.com
  tags:
  - Interoperability
  - EHR Integration
  - Healthcare
  properties:
  - type: Documentation
    url: https://lkcloud-api.readme.io/docs/lk-cloud-overview
  - type: APIReference
    url: https://lkcloud-api.readme.io/reference
- name: LKCloud FHIR R4 API
  description: >-
    HL7 FHIR R4 RESTful API (read/search/create/update/delete across R4 resources) over the
    ELLKAY interoperability platform, with a published CapabilityStatement. OAuth 2.0 Bearer +
    SiteServiceKey; errors returned as FHIR OperationOutcome resources.
  humanURL: https://lkcloud-api.readme.io/docs/lk-cloud-overview
  baseURL: https://fhir.lkcloud.com/R4
  tags:
  - FHIR
  - HL7
  - Healthcare
  properties:
  - type: APIReference
    url: https://lkcloud-api.readme.io/reference
  - type: CapabilityStatement
    url: https://fhir.lkcloud.com/R4/metadata
common:
- type: Website
  url: https://www.ellkay.com/
- type: DeveloperPortal
  url: https://lkcloud-api.readme.io/
- type: Documentation
  url: https://lkcloud-api.readme.io/docs/lk-cloud-overview
- type: APIReference
  url: https://lkcloud-api.readme.io/reference
- type: Authentication
  url: authentication/ellkay-authentication.yml
- type: ChangeLog
  url: changelog/ellkay-changelog.yml
- type: Blog
  url: https://www.ellkay.com/news
- type: Support
  url: https://www.ellkay.com/support
- type: Login
  url: https://dashboard.ellkay.com/Login
- type: PrivacyPolicy
  url: https://www.ellkay.com/privacy-policy
- type: LLMsTxt
  url: llms/ellkay-llms.txt
- type: WellKnown
  url: well-known/ellkay-well-known.yml
- type: Conventions
  url: conventions/ellkay-conventions.yml
- type: ErrorCatalog
  url: errors/ellkay-error-codes.yml
- type: RateLimits
  url: rate-limits/ellkay-rate-limits.yml
- type: Lifecycle
  url: lifecycle/ellkay-lifecycle.yml
- type: Conformance
  url: conformance/ellkay-conformance.yml
- type: Sandbox
  url: sandbox/ellkay-sandbox.yml
- type: MCPServer
  url: mcp/ellkay-mcp.yml
- type: DomainSecurity
  url: security/ellkay-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence