When submitting claims for OK BCBS the onset date is required. Please make sure this date appears on your CMS-1500. The "Date of Current Illness" (also known as the "on-set date") is entered into Box 14 to indicate the date of the first symptom/illness, accident/injury, or last menstrual period (LMP) for pregnancy.
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| CMS 1500 Professional | Box 14 | Loop 2300 DTP431 |
When submitting the UB-04, the "Occurrence Code" and associated date is entered in fields 31-36 and defines a significant event related to the claim. The occurrence code of 11 is used for onset date.
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| UB-04 Institutional | Fields 31-36 | Loop 2300 Segment HI · HI01-1 Qualifier BH · HI01-2 Occurrence Code 11 · HI01-3 Qualifier D8 · HI01-4 Date of Onset Example: HI*BH:11:D8:20100601 |