nx_fin_audit.nx

nx_fin_audit.nx -- R5 of THE NISHI FINANCIAL ECOSYSTEM: medical-bill OVERBILLING / anomaly audit. Dogfooded on the operator's multi-year cancer medical-overbilling crisis. Built on nx_money (exact no-float cents). DATA-DRIVEN BY CONSTRUCTION (#6/#11/#25): the engine has ZERO hardcoded CPT codes, thresholds, or multipliers -- every rule is a PACK passed in as data (the packs are grounded on the fetched NCCI/MUE/Medicare corpus and, in R6, loaded from a sovereign rule-pack store). Each check is a distinct LENS; a line can flag under more than one (reported per-check, never silently summed into one number that double-counts). Every overcharge is exact integer cents. CHECKS (each returns a flag count, writes flagged line indices to out_idx[], total overcharge to out_oc[0]): aud_duplicates -- same (code, date) billed more than once -> the repeat is the overcharge aud_unbundle -- a comprehensive code billed WITH a component code that NCCI bundles into it -> the component's charge is the overcharge (pack = ordered (comprehensive, component) pairs) aud_mue -- units billed exceed a code's Medically-Unlikely-Edit max -> the excess-units charge aud_fairprice -- billed exceeds (Medicare allowed * multiplier%) -> the amount above the fair ceiling No hardware writes; pure analysis over caller arrays (never mutates input). license_tier: ORIGINAL