ER billing by a Consulting or On Call Physician.

When a consulting oncall Physician sees a patient in the ER, how do I bill it? Should it be POS 23 outpatient with 99212-99215 or inpatient 99223-99233?

were they admitted?

If yes, then inpatient codes; if sent home, you can use the ER visit codes

Category of service

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http://codapedia.com/article_517_Category-of-Code-Selection.cfm

for help with category of code selection.