37 Fla. Stat. §627.613(2)

(2) Health insurers shall reimburse all claims or any portion of any claim from an insured or an insured’s assignees, for payment under a health insurance policy, within 45 days after receipt of the claim by the health insurer. If a claim or a portion of a claim is contested by the health insurer, the insured or the insured’s assignees shall be notified, in writing, that the claim is contested or denied, within 45 days after receipt of the claim by the health insurer. The notice that a claim is contested shall identify the contested portion of the claim and the reasons for contesting the claim.