When resubmitting an online claim through SimplePractice, we automatically include the resubmission reference code. If the reference code isn't auto-populated, this is because the code from the previous claim has been deleted.
In this case, you can try submitting the claim as a new claim so the resubmission code isn’t required. Many payers accept this. You can indicate the claim is a new claim by adjusting box 22 on the CMS form.
If you need to find the reference code for a previously filed claim, you can manually look it up by going to the Insights section and clicking on the Electronic Insurance Claims report.
You can find the initial claim and the reference code for resubmission here: