Group endpoint, historical data for new patients

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Lightbeam Development

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Sep 11, 2025, 4:19:48 PMSep 11
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Hello,

I have a question about how the group endpoint works using the _since parameter.  We are pulling data weekly using _since and passing in the last date we pulled as _since.  How does this work with new patients added to the ACO?  I would expect to get the historical data for new ACO patients even when using _since, but this isn't what we are seeing.  If this is the case, how should I handle making sure I get the historical data for newly attributed patients?

Thanks!
Lb

Beneficiary Claims Data API (BCDA) Community

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Sep 18, 2025, 5:20:31 PMSep 18
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Hi Lb,

You are correct in that you should be receiving historical data for all enrollees attributed after your _since date if you are using the Group endpoint. More information about how the _since parameter works with our Group and Patient endpoints is available on our website. BCDA receives updated attribution information each month. Use the /attribution_status endpoint to check the last time BCDA received an update for your model entity.

Are you receiving recent claims for those new enrollees? Depending on how the timing of your _since request aligned with the updated attribution, it is possible those enrollees were deemed "new" before your _since cutoff.

If the anticipated new enrollees were not present at all at the time this was sent, please let us know if this is still true after your next request.

Thank you,
The BCDA team
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