First, CPT for prolonged physician services can not be used alone. Prolonged services are add on codes. Providing physician must go over the original service's expected time by at least 30 minutes, again you can only use prolonged service codes with a CPT code that has time as part of its definition.
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You could not use prolonged services codes if you report surgery or global maternity care or a delivery. You can, however, use these codes when you report an E/M service.
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In the OB situation in which the CNM manages the labor and the ob-gyn ends up doing a cesarean, the CNM may bill for her time by coding a hospital admission and subsequent care up to the point that the physician took over, because the CNM cannot bill for the global care for cesarean delivery. In this case you need to make sure CNM was admitting provider and not the physician. If the CNM is the admitting, once you determine the level of E/M service, the CNM may also bill for prolonged inpatient service if the total time with the patient adds up to 30 minutes more than the typical time listed in the hospital care code.*
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For example, if the CNM reported 99222 for the hospital admission, she must spend at least 80 minutes with the patient face to face before reporting the prolonged service code as well. Her claim must include the normal documentation that carriers require for the inpatient admission code, plus a description of services that required her constant attention, plus the documented time with the patient.
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For Vaginal delivers which CNM are allowed to do, carriers might not reimburse prolonged services when labor progresses normally. The ob-gyn would step in when the baby gets stuck (perhaps needing vacuum extraction by the ob-gyn). In that case, and if the CNM does most of the delivery, you would not be able to report an E/M service for the labor management.