Wiki 76942 vs 20610

20610 is for the injection WITHOUT ultrasound guidance. 20611 is for the injection WITH ultrasound guidance. There is a parenthetical note below them both that states "do not report...in conjunction with 27369, 76942." That's because those codes contain the part about WITH or WITHOUT ultrasound. And 76942 is for Ultrasound guidance only. It could be for doing various things: biopsy, aspiration, injection, etc...
(Just a note: these are CPT codes and you asked the question in the ICD-10 forum.)
 
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