Definition of Concurrent Medically Directed Anesthesia Procedures with time calculation example

Concurrency is defined with regard to the maximum number of procedures that the physician is medically directing within the context of a single procedure and whether these other procedures overlap each other. Concurrency is not dependent on each of the cases involving a Medicare patient. For example, if an anesthesiologist directs three concurrent procedures, two of which involve non-Medicare patients and the remaining a Medicare patient, this represents three concurrent cases. The following example illustrates this concept and guides physicians in determining how many procedures they are directing.

EXAMPLE

Procedures A through E are medically directed procedures involving CRNAs and furnished between January 1, 1992 and December 31, 1997 (1998 concurrent instructions can be found in subsection C.) The starting and ending times for each procedure represent the periods during which anesthesia time is counted. Assume that none of the procedures were cataract or iridectomy anesthesia.

Procedure A begins at 8:00 a.m. and lasts until 8:20 a.m.
Procedure B begins at 8:10 a.m. and lasts until 8:45 a.m.
Procedure C begins at 8:30 a.m. and lasts until 9:15 a.m.
Procedure D begins at 9:00 a.m. and lasts until 12:00 noon.
Procedure E begins at 9:10 a.m. and lasts until 9:55 a.m.

Procedure  Number of Concurrent Medically Directed Procedures  Base Unit Reduction Percentage

A 2  10%
B 2 10%
C 3 25%
D 3 25%
E 3 25%

From 8:00 a.m. to 8:20 a.m., the length of procedure A, the anesthesiologist medically directed two concurrent procedures, A and B.


From 8:10 a.m. to 8:45 a.m., the length of procedure B, the anesthesiologist medically directed two concurrent procedures. From 8:10 to 8:20 a.m., the anesthesiologist medically directed procedures A and B. From 8:20 to 8:30 a.m., the anesthesiologist medically directed only procedure B. From 8:30 to 8:45 a.m., the anesthesiologist medically directed procedures B and C. Thus, during procedure B, the anesthesiologist medically directed, at most, two concurrent procedures.
From 8:30 a.m. to 9:15 a.m., the length of procedure C, the anesthesiologist medically directed three concurrent procedures. From 8:30 to 8:45 a.m., the anesthesiologist

medically directed procedures B and C. From 8:45 to 9:00 a.m., the anesthesiologist medically directed procedure C. From 9:00 to 9:10 a.m., the anesthesiologist medically directed procedures C and D. From 9:10 to 9:15 a.m., the anesthesiologist medically directed procedures C, D and E. Thus, during procedure C, the anesthesiologist medically directed, at most, three concurrent procedures.

The same analysis shows that during procedure D or E, the anesthesiologist medically directed, at most, three concurrent procedures.