From the transcript

The next item that will take effect will begin on January 1st, and these are changes to retroactive coverage for the Medicaid program. Currently, Medicaid provides 90-day retroactive coverage, which means that if an individual is determined eligible December 1st, providers can submit bills for reimbursement for Medicaid for healthcare costs— eligible healthcare costs were incurred in the 90 days leading up to December 1st. So, September, October, November. Beginning January 1st, HR1 changes the retroactive eligibility period and shortens it to 60 days for most adults who are covered through Medicaid and kids, and then 30 days for adults who are in the Medicaid expansion population. So what this means is that providers will have a more limited timeframe for which they can be reimbursed for services that were provided to individuals who are determined to be eligible for Medicaid beyond that 30 or 60-day window.