MM/DD/YY date plus qualifier (commonly 431 for Onset, 484 for LMP) — required when Box 16 names an accident qualifier or a medical-necessity narrative is on the claim.
Box 14 is blank while Box 16 has an accident qualifier, so the claim fails the required-with-16 rule. A future date is keyed. The payer-required qualifier code (431 vs 484) is omitted.