The prevalence of B12 deficiency after Roux en Y gastric bypass surgery is about 20%. Serum B12 levels <400 pg mL are considered suboptimal because 5 10% of patients w neurologic symptoms related to B12 insufficiency Medicare Part B Drug Requirements & Coverage Step Therapy Does Your Medicare Plan Cover B12 Shots? What is the recommended frequency for checking vitamin B12 levels in patients with varying risk factors, such as the elderly, those with a history of gastrointestinal surgery, or individuals with conditions like Does Medicare Cover Anemia? Medigap.com
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