Are you having chest pressure/angina symptoms? Also, are you short of breath when exercising to the point of affecting your quality of life?
These are important questions when evaluating treatment.
Apparently, the RCA has a natural bypass of collateral vessels that provide blood/oxygen to the area formerly served by the RCA. If so, you shouldn't need any intervention.
Lesions less than 70% occlusion do not require intervention according to the guidelines of the AAC/AHA unless there are associated symptoms uncontrolled with medication