Funds provided under section
1443 of this title may not be used to satisfy a financial commitment for services that would have been paid for from another public or private source, including any medical program administered by the Secretary of Defense, but for the enactment of this subchapter, except that whenever considered necessary to prevent a delay in the receipt of appropriate early intervention services by an infant, toddler, or family in a timely fashion, funds provided under section
1443 of this title may be used to pay the provider of services pending reimbursement from the agency that has ultimate responsibility for the payment.