I could not find an exact code. I was looking at 42440 but that is for removal of the submandibular gland itself (which the Wharton or submandibular duct drains saliva from). Your documentation states cystic tissue was removed. So, the only other option that I can see is to use 42699 (unlisted procedure, salivary glands or ducts) and submit the documentation with the claim. And, also code the dilation (42650) as you already have found.
Also look at code 42665 Ligation of salivary duct, intraoral. The description for this code is: "The physician makes an intraoral incision overlying a salivary duct and dissects to the layer of the duct. The duct is ligated (tied) and incision is closed." Based on the closure that your provider performed, you may be able to use this code. You could query your provider to find out if this code would be appropriate for the procedure.
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