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PRINCIPAL DIAGNOSIS CODE – DN521 . Definition: Code indicating principal diagnosis. Revised: 09/26/98 . Business Need: Utilization review; monitor medical outcomes. Source: UB92 Field 67 . Format: ANSI A/N 1/30 IAIABC ID 6 . Values: See Appendix – A131 . Imp Note: Used when Code List Qualifier ANSI DE 1270 = BK. Decimal point required. ................
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