When to Use Medicare XE, XP, XS & XU Modifiers

Effective January 1, 2015, CMS will officially roll out four new HCPCS modifiers, XE, XP XS and XU, that can be used when billing Medicare claims. Dubbed the –X{EPSU} subset, they may or may not be used instead of modifier 59. Not very clear, right? Unfortunately, there hasn’t been much clarification from CMS about the

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