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December 2016 Texas Medicaid Provider Procedures Manual

Radiology and Laboratory Services Handbook : 3 Radiological and physiological laboratory services : 3.2 Services, Benefits, Limitations, and Prior Authorization : 3.2.2 Computed Tomography and Magnetic Resonance Imaging : Authorization Requirements and Flexibility
Authorization is required for CT, CTA, MRI, fMRI, and MRA procedures.
Refer to:
If the ordering physician or radiologist determines that a CT, CTA, MRI, fMRI, or MRA procedure that is different from the authorized procedure is required or that additional procedures are required, the following will apply:
The procedure performed is less complex than the procedure authorized but of the same modality (e.g., an MRI with contrast is prior authorized and the actual procedure performed is an MRI without contrast). Full reimbursement is allowed for the billed procedure.
The authorized procedure is performed and an additional higher-level procedure of the same modality is deemed medically necessary within the same authorization period. A separate authorization is required. The additional procedure must be prior authorized separately and submitted on a separate claim.
The procedure billed is more complex than the procedure authorized but of the same modality. No authorization update will result in reimbursement according to the rate of the lesser authorized code. For full reimbursement of the more complex procedure, the authorization requires an update.
The following table includes the recognized relationships for authorization flexibility:

Texas Medicaid & Healthcare Partnership
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