Oklahoma Code § 85A-65

Title 85A. Workers' Compensation: Occupational disease
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A.  If an employee suffers from an occupational disease as
defined in this section and is disabled or dies as a result of the
disease, the employee, or, in case of death, his or her dependents,
shall be entitled to compensation as if the disability or death were
caused by injury arising out of work activities within the scope of
employment, except as otherwise provided in this section.
B.  No compensation shall be payable for an occupational disease
if the employee, at the time of entering into the employment of the
employer by whom the compensation would otherwise be payable,
falsely represented himself or herself in writing as not having
previously been disabled, laid off, or compensated in damages or
otherwise, because of the disease.
C.  1.  If an occupational disease is aggravated by any other
disease or infirmity, not itself compensable, or if disability or

death from any other cause, not itself compensable, is aggravated,
prolonged, accelerated, or in any way contributed to by an
occupational disease, the compensation payable shall be reduced and
limited to the proportion only of the compensation that would be
payable if the occupational disease were the major cause of the
disability or death as the occupational disease, as a causative
factor, bears to all the causes of the disability or death.
2.  The reduction in compensation is to be effected by reducing
the number of weekly or monthly payments or the amounts of the
payments, as under the circumstances of the particular case may be
for the best interest of the claimant.
D.  1.  "Occupational disease", as used in this act, unless the
context otherwise requires, means any disease that results in
disability or death and arises out of and in the course of the
occupation or employment of the employee or naturally follows or
unavoidably results from an injury as that term is defined in this
act.  A causal connection between the occupation or employment and
the occupational disease shall be established by a preponderance of
the evidence.
2.  No compensation shall be payable for any contagious or
infectious disease unless contracted in the course and scope of
employment.
3.  No compensation shall be payable for any ordinary disease of
life to which the general public is exposed.
E.  1.  When compensation is payable for an occupational
disease, the employer in whose employment the employee was last
injuriously exposed to the hazards of the disease and the carrier,
if any, on the risk when the employee was last injuriously exposed
under the employer shall be liable.
2.  The amount of the compensation shall be based on the average
weekly wage of the employee when last injuriously exposed under the
employer, and the notice of injury and claim for compensation shall
be given and made to that employer.
F.  1.  An employer shall not be liable for any compensation for
an occupational disease unless:
a. the disease is due to the nature of an employment in
which the hazards of the disease actually exist and is
actually incurred in the course and scope of his or
her employment.  This includes any disease due to or
attributable to exposure to or contact with any
radioactive material by an employee in the course and
scope of his or her employment,
b. disablement or death results within three (3) years in
case of silicosis or asbestosis, or one (1) year in
case of any other occupational disease, except a
diseased condition caused by exposure to X-rays,
radioactive substances, or ionizing radiation, after

the last injurious exposure to the disease in the
employment, or
c. in case of death, death follows continuous disability
from the disease, commencing within the period, for
which compensation has been paid or awarded or timely
claim made as provided in subparagraph b of this
paragraph and results within seven (7) years after the
last exposure.
2.  However, in case of a diseased condition caused by exposure
to X-rays, radioactive substances, or ionizing radiation only, the
limitations expressed do not apply.

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