An interventional Radiologist performs an Ankle Brachial Index which is abnormal. I would choose ICD10 code R94.30, Abnormal result of other cardiovascular function study to indicate the result. The Physician would then go on to order additional testing. Under this ICD10 code there are 3 specific tests that would qualify and the ABI does not fit into any of these 3. Does this prevent me from using this code for an abnormal cardio test such as the ABI?