Wiki Port access charge

[pastryrose2.0@gmail.com]

I am trying to figure out the proper charge codes for an outpatient port access. The patient in question requires infusion therapy on a frequent basis and has recently been implanted with a venous access device so she can administer her drugs at home. When she needs therapy she comes into the hospital for an outpatient service to have the port accessed and the Huber needle installed. I am not sure how to code this. Does it get coded as 96523 for an irrigation of implanted venous access as irrigation is a part of this process? This doesn't seem correct but neither does the HCPCS code set for home infusion therapy. Would a supply code be more appropriate with a charge for a nurse only encounter? Any help on this is appreciated.
Thank you!