Payment for treatment on the Sabbath
PAYMENT FOR TREATMENT ON THE SABBATH
150. Payment due to a doctor or hospital for services rendered on the Sabbath must be made after the Sabbath. If immediate payment is demanded, a suitable object may be offered as a pledge. If this is neither available nor acceptable, a cash payment may be made, without accepting change or asking for a receipt.
 Shemirat Shabbat Kehilchata 40:12.