The grievance system shall require an initial response within seven (7) days after a grievance is filed with the Plan. A grievance shall be resolved or finally determined by the Plan within ninety (90) days after the grievance is filed. This period may be extended if the Plan encounters a delay in obtaining the documents or records necessary to reach a decision on the grievance. The ninety (90) day time frame may be extended also by written agreement between the Plan and the person filing the grievance.
Okla. Admin. Code § 310:657-11-3