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You should not use modifier 91 for lab tests that are repeated to confirm initial results, due to equipment or specimen malfunctions, or when another one-time code is sufficient
10.3389/fcell.2021.756315 Front Cell Dev Biol
However, the use of futures methods as part of planning is still a relatively new topic, and the related case studies and theoretical literature are limited
It is commonly studied in models involving soft tissue response, gastrointestinal barrier integrity, inflammatory signaling, vascular response, and connective tissue remodeling
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