Wiki BCBS denying 99213 because of invalid diagnosis codes. Why? Can anyone give me insight.

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I am getting from denials from BCBS because of invalid diagnosis codes. The CPT code is 99213 and the diagnosis codes are M47.817, M54.41, M46.1 and M51.16. I don't understand why they keep doing this. Is one of the codes wrong or am I using one incorrectly. I work for a pain management specialist. They only started doing it this year (2021). Last year they paid.
 
The only issue I see is for M54.41, with an excludes note for M51.1___.
M54.41 Lumbago with sciatica, right side
Parent Code Notes: M54.4
Excludes1: lumbago with sciatica due to intervertebral disc disorder (M51.1-)
 
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