FISS Reason Code Overview

FISS reason codes are five-digit codes that direct the outcome of a claim edit or process; they are the “traffic cops” of the system. The following chart outlines the various positions of the FISS reason code.

If Position 1 =	Then Edit Type =	And Positions 2–5 Can Be =
1	Consistency edits	0125–999
3	FISS	0000–9799
4	File maintenance	Alpha 001–Alpha 899
5	Medical review	0001–999
7	Site specific (non-medical)	0001–999
A–Z	CWF (except W)	Current CWF four-digit error codes
W	IOCE/MCE and Grouper	0001–999

Revised 4/28/2016