---
updatedAt: 2026-06-29T15:05:51.000Z
agentTools:
  projectIndex: https://portal.api.modmed.com/llms.txt
---

# Retrieve RelatedPerson for an ID

Use [Authentication Endpoint](https://portal.api.modmed.com/reference/post_ws-oauth2-grant#/) page to get token

# OpenAPI definition

```json
{
  "openapi": "3.0.1",
  "info": {
    "title": "EMA Proprietary API",
    "contact": {
      "email": "ankit.srivastava@modmed.com"
    },
    "version": "3.4.3_FINAL",
    "description": "The EMA Proprietary FHIR API provides programmatic access to ModMed EMA clinical and practice-management data using FHIR R4-style resources under `/fhir/v2`.\n\nThis documentation targets the **public sandbox** (`stage.ema-api.com`).\n\n**Authentication.** Two mechanisms are supported during the current migration: the **legacy OAuth2 `password` grant** (being sunset) and the **new OAuth2 `client_credentials`** flow (recommended for new integrations) — see the **Authentication** guide. Every API call also requires the `x-api-key` header."
  },
  "servers": [
    {
      "url": "https://stage.ema-api.com/ema-dev/firm/apiportal/ema"
    }
  ],
  "tags": [
    {
      "name": "Charges/Financial",
      "description": "Charges/Financial details"
    }
  ],
  "paths": {
    "/fhir/v2/RelatedPerson/{id}": {
      "get": {
        "tags": [
          "Charges/Financial"
        ],
        "summary": "Retrieve RelatedPerson for an ID",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "description": "The resource ID",
            "required": true,
            "style": "simple",
            "schema": {
              "minimum": 1,
              "type": "string"
            },
            "example": "123"
          }
        ],
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "application/fhir+json": {
                "schema": {
                  "$ref": "#/components/schemas/FHIR-JSON-RESOURCE"
                }
              },
              "application/fhir+xml": {
                "schema": {
                  "$ref": "#/components/schemas/FHIR-XML-RESOURCE"
                }
              }
            }
          },
          "400": {
            "$ref": "#/components/responses/BadRequest"
          },
          "401": {
            "$ref": "#/components/responses/Unauthorized"
          },
          "403": {
            "$ref": "#/components/responses/Forbidden"
          },
          "404": {
            "$ref": "#/components/responses/NotFound"
          },
          "422": {
            "$ref": "#/components/responses/UnprocessableEntity"
          },
          "429": {
            "$ref": "#/components/responses/TooManyRequests"
          },
          "500": {
            "$ref": "#/components/responses/ServerError"
          }
        }
      }
    }
  },
  "security": [
    {
      "BearerAuth": [],
      "ApiKeyAuth": []
    }
  ],
  "components": {
    "schemas": {
      "FHIR-JSON-RESOURCE": {
        "type": "object",
        "description": "A FHIR resource"
      },
      "FHIR-XML-RESOURCE": {
        "type": "object",
        "description": "A FHIR resource"
      }
    },
    "securitySchemes": {
      "BearerAuth": {
        "type": "http",
        "scheme": "bearer",
        "bearerFormat": "JWT",
        "description": "OAuth2 access token (JWT). Obtain it via the legacy `password` grant or the new `client_credentials` flow (see the **Authentication** guide), then send as `Authorization: Bearer <token>`.",
        "x-default": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJhN2NiZmYwZWUxYjk0ODkwOWMxZmQzYzk3ODhlZjc1NCIsImlzcyI6Im1vZG1lZCIsInN1YiI6ImZoaXJfUWZMbG8iLCJ1cmxQcmVmaXgiOiJhcGlwb3J0YWwiLCJ0b2tlblR5cGUiOiJhY2Nlc3MiLCJ2ZW5kb3IiOiJmaGlyX1FmTGxvQGFwaXBvcnRhbCIsInBvbCI6ImNoYW5nZW1lIn0.f0VcA3R56IuAvdbPhInqUbhmEwk-tiOIeELVpTZCUZ8"
      },
      "ApiKeyAuth": {
        "type": "apiKey",
        "in": "header",
        "name": "x-api-key",
        "description": "Shared **sandbox** API key (public sandbox only). Send as the `x-api-key` header.\n\n`Zt9tXPIgz17uxEU6gkZPWa3ZAFhZOqm04oEDHC1f`",
        "x-default": "Zt9tXPIgz17uxEU6gkZPWa3ZAFhZOqm04oEDHC1f"
      }
    },
    "responses": {
      "BadRequest": {
        "description": "BAD REQUEST - The request was bad, often due to a missing required parameter"
      },
      "Unauthorized": {
        "description": "NOT AUTHORIZED - Authentication error; this token is not allowed access to the API"
      },
      "Forbidden": {
        "description": "FORBIDDEN"
      },
      "NotFound": {
        "description": "NOT FOUND"
      },
      "UnprocessableEntity": {
        "description": "UNPROCESSABLE ENTITY - Request could not be processed; typically a validation error"
      },
      "TooManyRequests": {
        "description": "TOO MANY REQUESTS - Request was rate limited (1000 calls/min default); please retry"
      },
      "ServerError": {
        "description": "SERVER ERROR - Internal Server Error"
      }
    }
  }
}
```