Joint count errors are the #1 audit flag in facet injection billing because CMS requires billing by the number of facet joints injected \u2014 not the number of nerves blocked \u2014 and high-volume interventional pain groups routinely misapply this distinction at scale, triggering Targeted Probe and Educate reviews that cost multi-provider practices an average of $340K in retroactive repayment demands.<\/p>\r\n
This isn’t a coder training problem. It’s a revenue cycle infrastructure failure \u2014 and for interventional pain groups running 500+ facet procedures annually, it compounds silently across MAC jurisdictions until a pre-payment review hold freezes the entire procedure line.<\/p>\r\n
CMS Article A57826 is unambiguous:<\/strong> when determining a billable level for CPT codes 64490\u201364495, providers must count the number of facet joints injected \u2014 not the number of medial branch nerves blocked. Each lumbar facet joint is innervated by two to three medial branch nerves.<\/p>\r\n Each cervical or thoracic facet joint is innervated by two nerves. Injecting multiple nerves at the same joint level remains one billable unit, regardless of needle count or drug volume.<\/p>\r\n The error pattern that generates OIG flags:<\/strong> a physician blocks three medial branch nerves targeting two lumbar facet joints. The claim is submitted for three levels \u2014 64493, 64494, and 64495 \u2014 rather than two. That single documentation-to-billing disconnect constitutes overbilling under Medicare’s own coding standard.<\/p>\r\n The Office of Inspector General audited Noridian’s facet injection payments and identified $4.2M in improper payments within a single MAC jurisdiction across a two-year audit period (OIG Report, February 2021).<\/p>\r\n For multi-state interventional pain groups operating across Noridian, Palmetto GBA, CGS Administrators, and Novitas jurisdictions simultaneously, the aggregate exposure from this single error pattern scales into seven figures.<\/p>\r\n