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Home About Contact Information More A Letter of Medical Necessity LOMN is required before we can reimburse certain claims. Common examples include massage therapy vitamins and supplements and weight loss programsall of which are often used to benefit general wellbeing. An LOMN confirms when these types of services products and programs are necessary to treat a diagnosed medical condition. An LOMN is like a prescription but with more detail explaining why the patient needs a specific treatment product or service.