ability and replaced it -with provisions for benefits now termed “permanent medical impairment.” See Colo.Sess.Laws 1991, ch. 219, § 8-42-107 at 1306. For all non-scheduled injuries, permanent impairment must now be determined based on the American Medical Association Guides to the Evaluation of Permanent Impairment, Revised Third Edition (AMA Guides). Section 8-42-101(3)(a)(I), C.R.S. (1994 Cum.Supp.).
The worker’s authorized treating physician determines the impairment rating as a percentage of the whole person. If either party disputes the rating, an independent medical examiner may be selected by mutual agreement of the parties, or, if they are unable to agree, an IME physician will be appointed by the Director from a list of accredited physicians maintained by the division. The impairment rating of an agreed-upon IME physician is binding upon both parties and the Director. The rating of a division-appointed IME physician is also binding unless either party is able to overcome the rating by “clear and convincing” evidence. Section 8^2-107(8)(e), C.R.S. (1994 Cum.Supp.); see Salmon & Salazar, *1991 Update on Workers’ Compensation Law,* 20 Colo.Law. 2223 (November 1991).
II. Facts
Here, the claimant was treated for his work injury by Dr. Andrew Plotkin, the employer’s authorized treating physician. After four weeks of total temporary disability, Dr. Plotkin determined that claimant had reached maximum medical improvement, and he released him to return to work with no work restrictions. In addition, Dr. Plotkin stated in his final report to the division that claimant had not sustained any permanent impairment. However, according to the claimant, Dr. Plotkin verbally advised him that he should not return to his former work as a furniture mover.
At the request of the Division of Labor, claimant was evaluated for vocational rehabilitation by Dr. Donald Harder. Dr. Harder concluded that claimant had sustained a permanent injury which prevented him from lifting more than 25 pounds or working in prolonged stooped positions.
Because Drs. Plotkin and Harder had differing opinions as to his condition, claimant requested that Dr. Harder perform an independent medical exam under § 8-42-107(8)(c) to determine his permanent impairment, if any. The respondents, however, refused to accept Dr. Harder as the mutually approved medical examiner. The division therefore appointed Dr. Neil Rosenberg to conduct the IME.
Dr. Rosenberg submitted a report finding that the claimant had “0% whole person impairment.” Although Dr. Rosenberg noted that the claimant had ongoing “mild chronic low back pain,” he said he could find “no abnormalities on neurologic examination to suggest a specific disorder,” and he thus concluded that claimant had suffered no permanent impairment.
The claimant disputed Dr. Rosenberg’s rating and requested a hearing on the matter. At the hearing, he called Dr. Harder to testify on his behalf. Dr. Harder was qualified as an expert in orthopedic medicine, physical medicine, and rehabilitation. Like Dr. Rosenberg, he is a level II accredited physician under § 8 — 42—101(3.6)(a)(II), C.R.S. (1994 Cum.Supp.).
Dr. Harder testified that the claimant has a 9% whole person impairment according to the AMA Guides. He explained that 5% of the impairment is based on a minimum of six months’ medically documented pain and rigidity of the lumbar spine, and the remaining 4% impairment is due to a loss of flexion.
Dr. Harder also opined that Dr. Rosenberg’s impairment rating did not comply with the AMA Guides. He testified that Dr. Rosenberg deviated from the Guides by not utilizing an applicable table, and by not specifying whether he had used an inclinometer when measuring the claimant’s lumbar range of motion, as recommended by the Guides. In addition, Dr. Harder noted that Dr. Rosenberg had crossed out his original numerical measurements of claimant’s lumbar flexion on the measurement chart and had substituted a second measurement. Dr. Harder stated that the substituted figure was the number 60, which “happens to be the very number that is normal.”