Wiki Pudendal Nerve Block Injections?

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This may be a bit vague as I didn't get much info on this... Has anyone heard or know of Doc's doing pudendal nerve block injections for the purpose of sphincter control? I have been told we are considering doing this in the office but are unsure if it will get paid? From what I have read Medicare will not cover it even for therapeutic reasons... So any input would be greatly appreciated.