Welcome to MedStar Family Choice Interoperability
API Gateway Developer Portal!

Enabling APIs to leverage access to a patient’s clinical and administrative data.

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Data APIs available

APIs for interoperability comprised of USCDI clinical data, CARIN administrative data, Da Vinci Formulary Drug data and Da Vinci Provider Directory data

How Do I Start?

The APIs of MedStar Family Choice Connected Interoperability Solution provide the basis for building healthcare applications, such as mobile, that deliver HL7® FHIR® data to members and providers on demand.  Some example applications use cases could be to view test results, check on medications, and review recent office visits.  

Our APIs allow access to clinical, administrative and formulary drug plan information about a patient, as well as provide detailed provider directory information.  Applications will securely interact with this data on behalf of the patient in order to deliver patients real-time access to their healthcare data. 

Key third party resources and links:

Our APIs


APIs that will connect a patient to their administrative data such as claim, explanation of benefits, member and coverage information that supports the Carin Consumer Directed Payer Data Exchange implementation guide

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APIs that will connect a patient to their clinical data, such as lab/diagnostic results, medications and more that support the USCDI implementation guide.

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Provider Directory

APIs that will give detailed information about a payer’s network of physicians and facilities with the goal of connecting patients to care providers that supports the Da Vinci Payer Data Exchange Plan Net Directory implementation guide.

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Drug Formulary

APIs that will allow a patient to explore their drug plan and understand drug tiers and cost sharing information that support the Da Vinci Payer Data Exchange US Drug Formulary implementation guide

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As an example, you can obtain member profile data based on tenant enrollment ID, subscriber ID and profile group by making an API call to

On the API page, you can test-execute this operation by clicking the “Try it” link and following the instructions.  In this case, you’ll receive an example set of member profile data in the returned response.

GET /member/{tenantenrollmentid}
"type": "object",
"properties": {
"tenantEnrollmentId": {
"type": "string",
"description": "Unique ID assigned."
"subscriberId": {
"type": "string",
"description": "The subscriber's ID."
"profileGroups": {
"$ref": "#/definitions/profileGroups"


MedStar Family Choice is a provider-sponsored Managed Care Organization servicing the Medicaid programs in the state of Maryland and Washington, D.C., In the District of Columbia, the Medicaid Managed Care Program is administered by the Department of Healthcare Finance (DHCF). In Maryland, the HealthChoice Program and the Maryland Children's Health Program are operated by the Maryland Department of Health (MDH).

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HL7® and FHIR® are the registered trademarks of Health Level Seven International and the use does not constitute endorsement by HL7.

*HL7 Da Vinci Project: Da Vinci is a private sector initiative that addresses the needs of the Value Based Care Community by leveraging the HL7 FHIR platform.

**The CARIN alliance:  https://www.carinalliance.com/about-us/