This case again requires that we review a decision of the Workers’ Compensation Court of Appeals resolving which of several employers is required to pay compensation awarded to an insulation worker disabled by asbestosis. A further question is whether the amount of employee’s benefits is to be determined by the law in effect at the time of his last substantial causative exposure to asbestos or by the law in effect on the date of his disablement. Having concluded that the compensation judge’s imposition of liability was based on a finding having substantial evidentiary support in view of the entire record and that he correctly refused to apply the bright line rule adopted by this court in
Flowers v. Consolidated Container Corp.,
Employee, who was exposed to asbestos in the course of his work between 1948 and June 10, 1981, and suffered disablement requiring him to stop working on June 11, 1981, brought this proceeding against six employers and their nine insurers to obtain compensation. In July 1982 this court had held that when an employee is disabled by an occupational disease, liability cannot be imposed on the last of multiple employers unless the last employment was a substantial contributing cause of the employee’s disability.
Busse v. Quality Insulation Company,
Based on employee’s unrefuted testimony, the compensation judge found that during the 1971-1974 period employee had substantial exposure to harmful asbestos fiber dust while doing tear outs of old insulation and also had some exposure to asbestos when applying new insulation. The compensation judge found also that this exposure had been a substantial contributing cause of employee’s disablement and disability, and that his subsequent occupational exposure, both with E & S and with Hippier, had not been. These findings resolved conflicting medical opinions on the effect of employee’s asbestos exposure.
Dr. Thomas Arnold, an internist, was uncertain that employee has asbestosis and expressed the opinion that he suffers from a chronic mild obstructive lung disease and mild pulmonary fibrosis caused by smoking cigarettes for many years. This opinion was not accepted by the compensation judge. Dr. Charles Drage agreed that employee has chronic obstructive lung disease, but also agreed with the other medical witness, Dr. Suresh Lagalwar, that employee has asbestosis which has resulted in total disability and a 50 percent permanent partial disability of the body as a whole.
Dr. Drage, a professor at the University of Minnesota and the director of the pulmonary function laboratory at the Ramsey Medical Center, said that there is a lag time between exposure to asbestos and the progression of the disease to the point at which it can be diagnosed. After reviewing X-rays of employee’s lungs, the witness said that a 1965 X-ray did not reveal the disease, but a 1973 film did, indicating that abnormal X-ray changes had occurred more than 17 years after employee’s first exposure to asbestos in 1948 and at most 25 years after that time. Dr. Drage felt that all of employee’s employment exposure in the period from 1948 to 1973 had been very heavy and had been a substantial contributing cause of the disease, but he also said that the exposure during the 3-year period of employment with E & S between October 1971 and October 1974 “could very well have been a significant factor” and that, based on the time lag characteristic of the disease, employee’s exposure during his subsequent employment was not a substantial contributing cause of his disease and disability because exposure within two to five years prior to his disablement had thus far contributed very little, if at all, to his condition.
Dr. Lagalwar, employee’s treating physician since May 1981, disagreed. He expressed the view that employee’s exposure during the period with Hippier between March 1980 and June 10, 1981, was a substantial aggravating cause of his disablement and disease. Dr. Lagalwar said that the disease process is a cumulative one and that the body’s ability to defend itself decreases as the process continues.
The compensation judge’s memorandum contains a thoughtful analysis of the conflicting medical testimony. The judge noted that Dr. Drage ruled out exposure after *41 1976 as a substantial causative factor in employee’s disablement on June 11, 1981, that employee had no exposure to asbestos from October 1974 until December 1976, and that Dr. Drage had viewed the period from October 1971 to October 1974 as a substantial contributing factor in employee’s disablement. The judge did not accept Dr. Lagalwar’s opinion that the last exposure had been a substantial aggravating factor because on cross-examination that witness had contradicted this opinion when he said that he did not know whether employee’s condition by 1982 would have been the same if he had had no further exposure to asbestos after 1975 and that a recent decrease in employee’s pulmonary function capacity as shown by a pulmonary function stress test would have been the same if employee had not had asbestos exposure after 1975. The compensation judge noted also that Dr. Lagalwar had given no testimony in this case about the time lag concept, but in another one had indicated that any time over 2 years after exposure “is a very significant period to cause increased symptoms.” On the basis of Dr. Drage’s consistent opinion, the compensation judge found the 1971-1974 employment period was the last one in which employee’s asbestos exposure had contributed substantially to cause or aggravate his disease. He determined also that employee has been temporarily totally disabled since June 11, 1981, and has a 50 percent permanent partial disability of the body as a whole due to lung impairment. He awarded compensation for permanent partial disability and accrued temporary total disability amounting to $35,080 and continuing temporary total disability benefits of $100 a week, the maximum rate in 1974. 1
Less than 2 weeks before the compensation judge’s decision was issued, this court had held in
Flowers
that when an employee suffers disablement from an occupational disease in the course of a single employment, a “bright line rule” should be applied to impose liability on the insurer on the risk when the disease results in disability.
Flowers,
On appeals taken by employee and by E & S and North River, a WCCA panel set aside the finding and determination, substituting a finding that employee sustained a personal injury in the nature of asbestosis as a substantial result of the effects of his exposure to asbestos during his last period of employment with Hippier. Accordingly, the panel imposed liability for the benefits awarded employee on Hippier and Western, but did not increase the amount of the award made by the compensation judge. The panel wrote separate opinions. Judge Wallraff urged that the bright line rule should be extended to those cases in which an employee who has been exposed to asbestos in many employments contracts asbestosis and ultimately suffers disablement. Judge Gard agreed, arguing that the bright line rule was a reasonable if not entirely equitable means of assessing liability in multiple-employment situations. He also concluded, as did Judge Rieke, that employee’s exposure during his work with Hippier had been “significant.”
Two weeks later the WCCA amended its decision to determine that employee was entitled to an award of $85,595, representing compensation for permanent partial disability based on the maximum weekly rate of $244 in effect on June 11, 1981, and for accrued temporary total disability at that rate with the adjustments required by Minn.Stat. § 176.645 (1982), and also was entitled to receive continuing temporary total disability benefits at the weekly rate of $244 subject to applicable provisions of the Workers’ Compensation Act.
*42
In this court Hippier and Western seek reversal of the WCCA’s decision, contending first that the panel exceeded its powers of review in substituting the finding that employee had suffered disablement as a substantial result of the effects of his occupational exposure during the period from March 1, 1980, through June 10, 1981, while employed by Hippier. It is apparent that the panel did not consider the scope of their review of the compensation judge’s decision. We recently addressed that issue in
Hengemuhle v. Long Prairie Jaycees,
We conclude that the WCCA exceeded its powers of review in substituting its finding that employee’s disablement was a substantial result of his asbestos exposure between March 1980 and June 10, 1981. The compensation judge’s finding was clearly supported by evidence that a reasonable mind could accept as adequate to support the conclusions that the exposure to asbestos in the 1971-1974 period was a substantial contributing cause of the progression of employee’s disease and of his ultimate disablement and that the occupational exposure following 1976 did not contribute substantially to his disablement. Consequently, the compensation judge’s findings must be reinstated.
E & S and North River nevertheless urge that because employee did have some asbestos exposure during his last period of employment, liability for the compensation awarded him should have been imposed on the last employer-insurer. However, the compensation judge correctly determined that the rule adopted in
Flowers
was applicable only to single-employment situations. In that case we justified adoption of the rule imposing liability on the insurer on the risk at the time of disability on the ground that when an employee has worked for a single employer during the development of his disease, “requisite causation” exists to impose liability on that insurer.
The other issue, the amount of benefits to be awarded employee, requires little discussion. The law in effect on the date an employee sustains a compensable injury governs the amount of compensation to which he is entitled.
Abram v. Art Goebel Ford,
Reversed in part, affirmed in part, and remanded for reinstatement of the findings of the compensation judge and an award of compensation as directed herein against E & S and North River.
The decision of the WCCA is reversed, and the matter is remanded for reinstate *43 ment of the decision of the compensation judge.
Notes
. The parties stipulated that employee's wages entitled him to compensation at the maximum rates in effect throughout his various periods of employment.