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The rules say that plans must pay for a medical service or item if regular Medicare would pay for it in this case. You can find this rule at 42 Code of Federal Regulations (CFR) Section 422.101.
The rules say Ambulance Service - For purposes of this section "hospital inpatient" means a beneficiary who has been formally admitted it does not include a beneficiary who is in the process of being transferred from one hospital to another. Where the patient is transferred from one hospital to another, and is admitted as an inpatient to the second, the ambulance service is payable under only Part B. If transportation is by a hospital owned and operated ambulance, the hospital bills separately using the ASC X12 837 institutional claim format or on Form CMS-1450 as appropriate. Similarly, if the hospital arranges for the ambulance transportation with an ambulance operator, including paying the ambulance operator, it bills separately. However, if the hospital does not assume any financial responsibility, the billing is to the A/B MAC (B) by the ambulance operator or beneficiary, as appropriate, if an ambulance is used for the transportation of a hospital inpatient to another facility for diagnostic tests or special treatment the ambulance trip is considered part of the DRG, and not separately billable, if the resident hospital is under PPS. Hospital bundling rules exclude payment to independent suppliers of ambulance services for beneficiaries in a hospital inpatient stay. The Common Working File (CWF) performs reject edits to incoming claims from independent suppliers of ambulance services. The CWF searches paid claim history and compares the line item service date on an ambulance claim to the admission and discharge dates on a hospital inpatient stay. The CWF rejects the line item when the ambulance line item service date falls within the admission and discharge dates on a hospital inpatient claim. Based on CWF rejects, the A/B MAC (B) must deny line items for ambulance services billed by independent suppliers that should be bundled to the hospital. Upon receipt of a hospital inpatient claim, CWF searches paid claim history and compares the period between the hospital inpatient admission and discharge dates to the line item service date on an ambulance claim billed by an independent supplier. The CWF shall generate an unsolicited response when the line item service date falls within the admission and discharge dates of the hospital inpatient claim. Upon receipt of the unsolicited response, the A/B MAC (B) shall adjust the ambulance claim and recoup the payment. Ambulance services with a date of service that is the same as the admission or discharge date on an inpatient claim are separately payable and not subject to the bundling rules. The CWF performs an additional edit before determining if the ambulance line item should be rejected when the beneficiary is an inpatient of a long term care facility (LTCH), inpatient psychiatric facility (IPF) or inpatient rehabilitation facility (IRF) and is transported via ambulance to an acute care hospital to receive specialized services. The CWF edits the claim for the presence of occurrence span code 74 (non-covered level of care) and the associated occurrence span code from and through dates. The CWF bypasses the reject edit when the ambulance line item service date falls within the occurrence span code 74 from and through dates plus one day. In this case, the ambulance line item is separately payable. The CWF rejects the ambulance line item when the service date falls outside the occurrence span code 74 from and through dates plus one day. You can find this information in the Medicare Claims Processing Manual; Chapter 3 - Inpatient Hospital Billing; 10.4 - Payment of Nonphysician Services for Inpatient and 10.5 - Hospital Inpatient Bundling.
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com.