California Subscriber
Answer: CPT makes it pretty clear that delivery services include admission to the hospital and the admission history and physical exam.
If the patient is in labor and the ob-gyn admitted her for delivery and she delivers, you should not report the services the ob-gyn provided within the 24 hours prior to delivery separately whether that involves the hospital admission services or labor management. These services are included in the delivery code you will be billing. ACOG agrees that even the "delivery only" codes would include hospital admission.
If she delivers more than 24 hours after admission and the ob-gyn did not admit her for delivery, but then the patient goes on to deliver, you could appropriately report for the admission separately. However, you'll probably have some difficulty getting reimbursed - especially if the patient is term with no complications other than a very long labor.