j code for b12 injection CPT 96372 Guide – Coding Tips How to Give a B12

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But those trials were small (approximately 300 subjects total across phases), short (up to 24 weeks), and used a route of administration that likely delivered minimal systemic exposure

For patients on established B12 injection therapy, monitoring is based primarily on clinical response and haematological parameters rather than routine serum B12 measurements, which may remain very high without indicating harm or overtreatment