Okla. Stat. tit. 85A, § 85A-86

A. 1. Each employer desiring to controvert an employee's right

to compensation may file with the Workers' Compensation Commission

on or before the fifteenth day following notice of the alleged

injury or death a statement on a form prescribed by the Commission

Oklahoma Statutes - Title 85A. Workers' Compensation Page 110

that the right to compensation is controverted and the grounds for

the controversion, the names of the claimant, employer, and carrier,

if any, and the date and place of the alleged injury or death.

2. Failure to file the statement of controversion shall not

preclude the employer's ability to controvert the claim or cause it

to waive any defenses. The employer can make additional defenses

not included in the initial notice at any time.

B. If an employer is unable to obtain sufficient medical

information as to the alleged injury or death within fifteen (15)

days following receipt of notice, although the employer has acted in

good faith and with all due diligence, the employer may apply in

writing for an extension of time for making payment of the first

installment or controverting the claim. This written application is

to be postmarked within the fifteen-day period. The Commission may,

in its discretion, grant the extension and fix the additional time

to be allowed. Filing of application for an extension shall not be

deemed to be a controversion of the claim.

C. The provisions in subsection B of this section shall not

apply in cases where the physician is an employee of, on retainer

with, or has a written contract to provide medical services for the

employer.