Interrupted-service modifiers work great with some codes – but wipe out with others
It may not be the high overall denial rates that best explain why the two interrupted-service modifiers, 52 (Reduced services) and 53 (Discontinued procedure), are so tricky; it could have something to do with the mix of codes that seldom, if ever, get denied with the modifiers, and those that get rejected most or all of the time.
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