Wiki Why add a modifier 51 to CPT 36478?

[Whmsally@aol.com]

I see where a coder is applying a 51 modifier to cpt 36478. This is when it is billed with 37765 or 37766.
I cannot find any info on this. The 51 cuts the WRVUs to 50% so I am curious as if the 51 is necessary.
It might be a coding change that I have missed a long the way,
Any info on this would be greatly appreciated.

Best,
Annette

 

[CodingKing]

Multiple surgery reduction rules have been in effect for many years. Primary procedure pays 100%, second and additional procedures pay 50 or 25%. depending on payer
Most payers don't want the -51 to be applied (CMS for example), they will append the -51 themselves to lower value procedures to apply the reduction