Field 1 (5 char) CODE1 -- CPT or HCPCS code
Field 2 (5 char) CODE2 -- CPT or HCPCS code that cannot be billed with code1
Field 3 (7 char) EFFDATE (4-digit year plus 3-digit day numbered from the start of the year) -- effective date
Field 4 (2 char) REASON -- CC for comprehensive component and ME for mutually exclusive
Field 5 (1 char) MODFLAG* -- modifier flag


* About the modifier flag: An appropriate modifier must be used with a code for which a modifier is appropriate. This code may be a column one or column two code.

The definition of a modifier according to the CPT-4 manual is as follows:
- A modifier provides the means by which the reporting position (or provider) can indicate that a service or procedure that has been performed has been altered by some specific circumstance but not changed in its definition or code.
The correct coding file formats have been expanded to include a modifier indicator for both the Mutually Exclusive Code and the Comprehensive Component Code tables. These indicators provide information regarding whether or not the use of a modifier should be added to report a service, since the meaning attached to the modifier adds specificity about the services being billed which helps to differentiate between the services represented by the different codes. Assuming the modifier is used correctly and appropriately, this specificity provides the basis upon which separate payment for the services billed may be considered justifiable. Generally, the modifiers which are most likely to add specificity, or further information to the billed codes, are: E1-E4, FA, F1-F9, TA, T1-T9, LT, RT, LC, LD, RC, 58, 59, 78 and 79.
The CCE modifier indicators are (0), (1), or (9). A (0) indicates that there are no circumstances in which a modifier would be appropriate. The services represented by the code combination will not be paid separately. A (1) indicates that a modifier is allowed in order to differentiate between the services provided. A (9) indicator is used for all code pairs whose deletion date is the same as their effective date.


CODE1	CODE2	EFFDATE	REASON	MODFLAG
00100	01996	2009182	CC	1
00100	31505	1996001	CC	1
00100	31515	1996001	CC	1
00100	31527	1996001	CC	1
00100	31622	1996001	CC	1
00100	31645	1996001	CC	1
00100	36000	1996001	CC	1
00100	36010	1996001	CC	0
00100	36011	1996001	CC	1
00100	36012	1996001	CC	1
.....
10061	20005	1996001	ME	1
10160	10061	1996001	ME	1
10160	10140	1996001	ME	1
11000	11010	1997274	ME	1
11000	11011	1997274	ME	1
11000	11012	1997274	ME	1
11000	11056	1998091	ME	1
11000	11057	1998091	ME	1