nx_medbill_recon.nx

nx_medbill_recon.nx -- M2 of the MEDICAL BILLING ladder (/compare/medbilling): parse an ITEMIZED BILL or EOB text document into structured claim lines, then RECONCILE bill-vs-EOB with exact no-float cents. A claim line = a text line carrying ALL THREE of: a date, a 5-char procedure code (CPT/HCPCS shape, >=4 digits), and at least one $-money token -- header/footer prose never qualifies (an account number alone is not a claim line). Money REQUIRES the $ prefix (a bare year is never money). EOB lines carry billed/allowed/patient columns (first/second/last money); a bill line's charge = its LAST money. RECON is a CONSUMING matcher (code+date, each EOB line matches at most once -- so a duplicate bill line has nothing left to match = NOT-ON-EOB) with flags: 1=NOT_ON_EOB (amount=charge), 2=BILLED_MISMATCH (|bill - EOB billed|), 3=ABOVE_ALLOWED (charge - allowed). It reports; it never fabricates a line and never auto-acts (findings feed the fail-safe R8 dispute letter). license_tier: ORIGINAL