Wiki AI modifier with Critical Care?

Correct Use of AI modifier:

Append to initial/subsequent E/M codes only
99221 ? 99223 (Hospital-Initial)
99231 ? 99233 (Hospital-Subsequent)
99291 (Critical Care)
99304 ? 99306 (SNF-Initial)
99307 ? 99310 (SNF-Subsequent)

Only principal physician of record appends to E/M code
 
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