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B12 is a water-soluble vitamin with a key role in the normal functioning of the brain and nervous system, and for the formation of blood

Common side effects may include: Redness or irritation at the injection site Fatigue Nausea If you experience severe side effects or allergic reactions, seek medical attention immediately

No side effects were reported, and some patients felt better within just 2 weeks

To protect your revenue cycle from automated denials in 2026, billing teams must strictly separate these therapeutic injections from immunizations, which require code CPT 90471, and chemotherapy or complex biologics, which require 96401 code CPT