Denial patterns, documentation standards, and appeal workflows built around how each specialty actually gets paid.
Every guide is grounded in primary sources: CMS manuals and transmittals, the Federal Register, the Medicare Coverage Database, AMA CPT, and the X12 CARC list. Where something could not be verified against a primary source, the guide says so rather than sounding confident.
The parity argument most practices never make, the authorization workflow that prevents CARC 197 before it happens, and how to file an external appeal that does not get dismissed on procedure.
Where the cosmetic line actually gets decided, modifier 25 documentation that stands up on its own, and the biopsy, excision, and destruction code families behind most bundling denials.
The 8-minute rule as CMS actually writes it, including the remainder unit rule that is mandatory rather than optional, the plan of care certification exception that changed in January 2025, and the CY 2026 KX threshold at $2,480.
Implant billing (pass-through versus packaged), POS 24 versus 22 and what a wrong POS actually does, the multiple procedure reduction, and the 560 procedures CMS added to the covered procedures list for CY 2026.
Intravitreal injection laterality with the current J-code and biosimilar list, cataract global period modifiers, premium IOL billing (V2787 and V2788, and why no ABN is required), and NCCI Chapter 8 bundling.
Global period modifiers 24, 57, 58, 78, and 79 and which ones restart the clock, joint injections 20610 and 20611, the three fracture care paths rather than two, and the assistant surgeon indicators most references state backward.
Generalist billing treats a denial as a clerical error to rework and resubmit. Specialty billing treats it as a signal about which rule was missed.
A down-coded 90837 is usually a documentation gap, not a coding mistake. An ASC implant denial is usually a pass-through classification that rotated and nobody updated the charge master. An assistant surgeon denial on a spine case is usually a payment policy indicator that was knowable before the case was booked.
The specialty determines the playbook, and most of the playbook is knowable in advance. That is the part worth building around.
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