Unexpected Historical Data Returned

[imran zulfiqar]

Hi Team,

I ran a job for two clients to retrieve the latest data and set the 'since' parameter with the last downloaded date (18-08-2025). However, instead of only new records, it returned both new and historical data for both ACO. Please advise. I’ve shared the job ID below for 1.
{https://api.bcda.cms.gov/api/v2/jobs/141427}

Best Regards,
Imran Zulfiqar | Data Engineer

[Beneficiary Claims Data API (BCDA) Community]

Hi Imran,

It looks like job 141427 was started using the /Group endpoint. Requests to the /Group endpoint using the _since parameter will return resources updated after the date provided for existing enrollees and all resources for newly attributed enrollees. Try using the /Patient endpoint if you wish to limit resources for all enrollees with the _since parameter.

Visit our recently updated documentation to learn more about the _since parameter and the differences between the /Group  and /Patient endpoints. Please let us know if you have any additional questions.

Thanks,

The BCDA Team