How long after death can medical bills be presented to an executor?

This depends on the circumstances of the estate.  If no estate has been established (i.e., no petition for administration has been filed in Probate court), Florida applies a 2 year statute of limitations.  After 2 years, creditors may not file a claim.  If the Probate Court has opened administration of the estate and issued Letters of Authority to a Personal Representative, creditors generally have 90 days from first publication of the Notice of Administration or 30 days from receiving a Notice to Creditors, whichever is later, to file a claim.  However, the Personal Representative is charged with responsibility to identify possible creditors and send them a Notice to Creditors.  If the Personal Representative fulfills his or her responsibility, the 90 day claim period will hold.

I hope this answers your question.