initial hospital care vs subsequent

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My provider was on call and spent 2 dates going back to the ICU to check on a patient. The first visit was on Saturday, 99221-99223 coding, and then every 12 hours, Sunday. Would I use a initial and then a subsequent and that is it? I know I cannot bill the 2 visits separate that were done on Sunday. Is there a modifier I am missing? The only modifier I found is a 24 but that has specifics of post operative. Thanks.
 

SharonCollachi

True Blue
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You can bill for extended time if the time on Sunday exceeded the total time for 99233 (35 minutes).

Look at 99356-99357. The first hour starts at 31 minutes past the typical time, so if he spent more than 65 minutes, you're good for these codes.
 
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