To get a good answer you still need to provide us with the denial reason/s and whether one or both was denied.
Leg pain (by itself) is not considered a medically necessary reason to perform a vascular ultrasound. And carotid duplex scans have frequency limitations.
Check your LCD - as an example,
"Peripheral artery studies may not be considered medically necessary if only the following signs and symptoms are present:
• Continuous burning of the feet (considered to be a neurologic symptom);
• Leg pain, nonspecific (729.5) and pain in limb (729.5) as single diagnoses are too general to warrant further investigation unless they can be related to other signs and symptoms;
• Edema rarely occurs with arterial occlusive disease unless it is in the immediate postoperative period, in association with another inflammatory process or in association with rest pain; and/or
• Absence of pulses in minor arteries, e.g., dorsalis pedis or posterior tibial, in the absence of symptoms. The absence of pulses is not an indication to proceed beyond the physical examination unless it is related to other signs and/or symptoms.
And "Guidelines for follow-up cerebrovascular arterial studies include:
•Stenosis of 20-49% (diameter reduction), an annual study;
•Stenosis of 50-79%, every six months;
•Stenosis of 80-99%, every 6 months if surgery not performed; and/or
•After carotid endarterectomy, repeat ipsilateral/unilateral examinations are allowable at six weeks, six months, and one year. During the first year, follow-up studies should be on the ipsilateral side unless signs and symptoms or previously identified disease in the contralateral carotid artery provide indications for a bilateral procedure.