Infusion services can be an important aid -- not only in the treatment of multiple sclerosis (MS, 340, Multiple sclerosis) but also in a variety of other neuromuscular disorders. These services can also provide you with a steady stream of reimbursement. Here's a quick list of the top infusion codes you-re likely to encounter: - 358.00 -- Myasthenia gravis without (acute) exacerbation - 333.91-- Stiff-man syndrome - 357.89 -- Other inflammatory and toxicneuro- pathy - 357.81 -- Chronic inflammatory demyelinating polyneuritis