Tennessee's grand divisions behave like three markets, and a claim written in Memphis does not always land the way the same claim written in Kingsport does. Nashville, Franklin, and Brentwood practices carry dense Medicare Advantage and commercial volume, each plan holding its own authorization list and its own read on medical necessity. Around Jackson, Johnson City, and the Cumberland Plateau towns, an hour in the car for a skin check is ordinary, and a correction that requires a second visit costs an appointment the schedule cannot refill quickly.
Clean is not an absolute in this business. The same excision, coded the same way, can pass one payer's edits and trip another's, so we maintain requirements carrier by carrier instead of applying a single house standard to everything. Biologics for psoriasis and atopic dermatitis, photodynamic therapy, and certain lesion procedures carry plan-specific conditions, and what a Chattanooga Medicare Advantage plan approves is not always what a Knoxville employer group's commercial plan will approve.
Underneath the payer variation, dermatology claims fail in a short list of places: an E/M billed the same day as a biopsy without support for modifier 25, separate-site work missing modifier 59, excisions sized after the margins are taken, Mohs stages documented one block short. Most of that can be settled in the chart at the time of service, and settling it there costs less than appealing it later. Working across 42 states, we tend to watch a carrier tighten an edit somewhere else first, then push the correction into our scrub rules, which is what keeps average A/R at 23 days.