64640 & 64450

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I was wondering guidelines for billing 64450, 64640 & 77002. If the patient is having knee pain after a knee replacement the provider would like to offer radiofrequency ablation and then possibly a subsequent spinal cord stimulator trial if needed.
Coding billed out: 64450 (X how many blocks they preform), plus 77002 for fluoroscopy and then RFA by itself (64640)?
Thank you in advance!
 
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