Using Z12.11 for both polyp removals for colonoscopies

Duluth, MN
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Has anyone seen if there's been a coding change regarding colonoscopies? When a patient has a screening colonoscopy, I of course use Z12.11 as the primary code, followed by polyp codes (if found). I've had a couple remits come back where they paid for 45385, but are putting 45384 towards their deductible. When I was trained for this position many years ago, I was told to only use the Z12.11 for the main procedure code. But it's making me wonder if they're wanting the Z12.11 used for both procedure codes now? It seems to me it's an error on their end of processing, but thought I'd see if anyone was aware of a change that I missed.