of the one hundred four weeks to determine the degree of
impairment due to the compensable injury, if any. The degree of
impairment shall be determined based upon an evaluation by a
physician who is licensed in this Commonwealth, who is certified
by an American Board of Medical Specialties approved board or
its osteopathic equivalent and who is active in clinical
practice for at least twenty hours per week, chosen by agreement
of the parties, or as designated by the department, pursuant to
the most recent edition of the American Medical Association
"Guides to the Evaluation of Permanent Impairment."
(2) If such determination results in an impairment rating
that meets a threshold impairment rating that is equal to or
greater than fifty per centum impairment under the most recent
edition of the American Medical Association "Guides to the
Evaluation of Permanent Impairment," the employe shall be
presumed to be totally disabled and shall continue to receive
total disability compensation benefits under clause (a). If such
determination results in an impairment rating less than fifty
per centum impairment under the most recent edition of the
American Medical Association "Guides to the Evaluation of
Permanent Impairment," the employe shall then receive partial
disability benefits under clause (b): Provided, however, That no
reduction shall be made until sixty days' notice of modification
is given.
(3) Unless otherwise adjudicated or agreed to based upon a
determination of earning power under clause (b)(2), the amount
of compensation shall not be affected as a result of the change
in disability status and shall remain the same. An insurer or
employe may, at any time prior to or during the five hundred-
week period of partial disability, show that the employe's
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