> ## Documentation Index
> Fetch the complete documentation index at: https://nango.dev/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Epic (FHIR) - How do I connect a health system?

## Overview

To authenticate with Epic, you need:

1. **Interconnect Server URL** — Epic builds both the OAuth2 token endpoint (`<Interconnect Server URL>/oauth2/token`) and the FHIR API base (`<Interconnect Server URL>/api`) off this value, so Nango derives both automatically.

This guide will walk you through finding your Interconnect Server URL. Client ID, Key ID, Private Key, and Scope are registered once on the integration itself, not per connection — see [How to register your own Epic app](/docs/api-integrations/epic/how-to-register-your-own-epic-app) if you haven't done that yet.

### Prerequisites

* The health system has activated/installed your app from Epic's App Market, and their Epic administrator has mapped your Client ID to a local account.

### Step 1: Finding your Interconnect Server URL

Epic (or the health system's IT/Epic team) provides this when the health system activates your app from the App Market — it's specific to that health system's Epic environment, e.g. `fhir.epic.com/interconnect-fhir-oauth`.

### Step 2: Enter your Interconnect Server URL in the Connect UI

Once you have it:

1. Open the form where you need to authenticate with Epic.
2. Enter your **Interconnect Server URL** in the designated field.
3. Submit the form, and you should be successfully authenticated.

<img src="https://mintcdn.com/nango/zCQ4geAz0k_AETGb/api-integrations/epic/form.png?fit=max&auto=format&n=zCQ4geAz0k_AETGb&q=85&s=ab8b2e24b19f8d24ab0fb9544885ff68" style={{maxWidth: "450px" }} width="501" height="704" data-path="api-integrations/epic/form.png" />

You are now connected to Epic.