STUMBO, Justice.
On March 16, 1990, claimant injured his back at work while in the employ of Sun Glo Coal Company (Sun Glo). He was paid temporary, total disability (TTD) benefits until August 19, 1990, after which he returned to work despite continuing problems with his back. On April 9, 1991, claimant again injured his back at work while in the employ of Trojan Mining, Inc. (Trojan), the successor corporation to Sun Glo. Claimant was paid TTD benefits until July 30,1991, but has not returned to work since that time. Claimant filed claims for permanent workers’ compensation benefits for the 1990 and 1991 injuries. Prior injuries included a 1977 back injury, for which a 6% occupational disability was awarded, and a 1988 knee injury, for which a 10% occupational disability was awarded.
After reviewing the evidence, the Administrative Law Judge (ALJ) determined that the combined effects of all of his injuries had rendered claimant totally occupationally disabled but that 16% of the disability was prior, active, and noncompensable. The remaining 84% disability was attributed, equally, to the 1990 and 1991 injuries, with the ALJ observing that claimant’s return to work after the 1990 injury was on a trial basis and that he had substantial difficulties performing his duties after that time. Liability for the 1990 injury was apportioned, equally, to Sun Glo and the Special Fund and ordered payable from August 20, 1990, for so long as claimant remained disabled. Whereas, liability for the 1991 injury was apportioned, equally, to Trojan and the Special Fund and ordered payable from July 1, 1991, for so long as claimant remained disabled.
The Special Fund petitioned for reconsideration, arguing that disability caused by a subsequent injury may not enhance the extent of liability for a prior injury. Johnson v. Scotts Branch Coal Co., Ky.App., 754 S.W.2d 555 (1988). Hence, the 1991 injury should not enhance the payment period for the 1990 injury. The petition was overruled, and the Special Fund appealed.
The Workers’ Compensation Board (Board) was persuaded by the argument that Johnson prohibited treating the award for the 1990 injury as a percentage of total disability since claimant did not actually become totally disabled until 1991. Therefore, the Board reversed the award to that extent, rejecting claimant’s argument that since he was totally disabled, he was entitled to lifetime benefits for both injuries. Claimant appealed.
The Court of Appeals affirmed the decision of the Board, emphasizing that an award of lifetime benefits for the 1990 injury was inconsistent with the ALJ’s findings. Although the ALJ had found that claimant’s return to work after the 1990 injury was only on a trial basis, the ALJ had not determined that claimant was totally disabled after the injury. Furthermore, the fact that claimant had been able to return to his former job for some eight months after the injury indicated that he was not totally disabled at that time. Therefore, the Court of Appeals concluded that claimant was entitled to receive only [606]*606partial disability benefits for 425 weeks for the 1990 injury and that lifetime benefits should begin only after the 1991 injury.
In a concurring opinion, Judge Johnson noted that although Brownies Creek Collieries v. Lingar, Ky.App., 794 S.W.2d 641 (1990), was cited by the claimant, it actually supported the decision of the Board. In that case, the award of total disability did not commence until November 27, 1985, the injured worker’s last day of work. Id. at 642.
Claimant now appeals to this Court, arguing that since the claims for the 1990 and 1991 injuries were litigated together and since the two injuries rendered him totally disabled, the decision in Campbell v. Sextet Mining Co., Ky., 912 S.W.2d 25 (1995), controls these facts. Therefore, he asserts that he is entitled to have benefits for both injuries computed as a percentage of total disability, pursuant to KRS 342.730(1), and paid for life. By contrast, Sun Glo (the 1990 employer) and the Special Fund present several arguments in support of the premise that this Court’s decision in Campbell was erroneous and should be reconsidered.
First, Sun Glo emphasizes that claimant was only partially disabled after the 1990 injury and that he did not, in fact, become totally disabled until after sustaining the subsequent injury in 1991. Therefore, he was not entitled to benefits for total disability until that time. Sun Glo argues that the extent of an employer’s liability for an injury cannot be enhanced by a subsequent injury which was incurred in a subsequent employment and that the Court’s basis for distinguishing Johnson was meaningless in view of the case’s holding. Furthermore, Sun Glo argues that the Court’s reliance on Beale v. Shepherd, Ky., 809 S.W.2d 845 (1991), and on prior eases which involved combined claims for occupational disease and injury was misplaced and that those cases do not support enhancing an employer’s liability by virtue of disability resulting from a subsequent injury which was incurred in a subsequent employment. Second, Sun Glo emphasizes that the partial disability caused by the 1990 injury clearly constituted a prior, active condition at the time the 1991 injury occurred. Any attempt by Campbell to treat it otherwise is contrary to the longstanding definition of the term. Third, Sun Glo argues that Campbell results in the inconsistent treatment of workers depending upon whether successive injuries which result in total disability are litigated together or sequentially. Finally, Sun Glo argues that if the Court reaffirms the decision in Campbell, the Special Fund should be held hable under the principle of “excess disability” for the difference between a 21% permanent, partial disability award, payable for 425 weeks, pursuant to KRS 342.730(l)(b), and whatever benefits are awarded for disability attributable to the 1990 injury. See KRS 342.120(6), (7).
The Special Fund agrees with Sun Glo that the decision in Johnson provides á blanket prohibition against the consideration of any subsequent disability to enhance the duration of an award. Furthermore, the Special Fund asserts that the ALJ’s award of lifetime benefits for the 1990 injury, despite the fact that claimant continued to work thereafter, was contrary to Osborne v. Johnson, Ky., 432 S.W.2d 800 (1968), as well as to Lingar, supra, at 642. Finally, the Special Fund asserts that the decision in Campbell “muddied the law of excess disability.”
The source of the controversy in this case, as in Campbell, is the fact that, although KRS 342.730
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STUMBO, Justice.
On March 16, 1990, claimant injured his back at work while in the employ of Sun Glo Coal Company (Sun Glo). He was paid temporary, total disability (TTD) benefits until August 19, 1990, after which he returned to work despite continuing problems with his back. On April 9, 1991, claimant again injured his back at work while in the employ of Trojan Mining, Inc. (Trojan), the successor corporation to Sun Glo. Claimant was paid TTD benefits until July 30,1991, but has not returned to work since that time. Claimant filed claims for permanent workers’ compensation benefits for the 1990 and 1991 injuries. Prior injuries included a 1977 back injury, for which a 6% occupational disability was awarded, and a 1988 knee injury, for which a 10% occupational disability was awarded.
After reviewing the evidence, the Administrative Law Judge (ALJ) determined that the combined effects of all of his injuries had rendered claimant totally occupationally disabled but that 16% of the disability was prior, active, and noncompensable. The remaining 84% disability was attributed, equally, to the 1990 and 1991 injuries, with the ALJ observing that claimant’s return to work after the 1990 injury was on a trial basis and that he had substantial difficulties performing his duties after that time. Liability for the 1990 injury was apportioned, equally, to Sun Glo and the Special Fund and ordered payable from August 20, 1990, for so long as claimant remained disabled. Whereas, liability for the 1991 injury was apportioned, equally, to Trojan and the Special Fund and ordered payable from July 1, 1991, for so long as claimant remained disabled.
The Special Fund petitioned for reconsideration, arguing that disability caused by a subsequent injury may not enhance the extent of liability for a prior injury. Johnson v. Scotts Branch Coal Co., Ky.App., 754 S.W.2d 555 (1988). Hence, the 1991 injury should not enhance the payment period for the 1990 injury. The petition was overruled, and the Special Fund appealed.
The Workers’ Compensation Board (Board) was persuaded by the argument that Johnson prohibited treating the award for the 1990 injury as a percentage of total disability since claimant did not actually become totally disabled until 1991. Therefore, the Board reversed the award to that extent, rejecting claimant’s argument that since he was totally disabled, he was entitled to lifetime benefits for both injuries. Claimant appealed.
The Court of Appeals affirmed the decision of the Board, emphasizing that an award of lifetime benefits for the 1990 injury was inconsistent with the ALJ’s findings. Although the ALJ had found that claimant’s return to work after the 1990 injury was only on a trial basis, the ALJ had not determined that claimant was totally disabled after the injury. Furthermore, the fact that claimant had been able to return to his former job for some eight months after the injury indicated that he was not totally disabled at that time. Therefore, the Court of Appeals concluded that claimant was entitled to receive only [606]*606partial disability benefits for 425 weeks for the 1990 injury and that lifetime benefits should begin only after the 1991 injury.
In a concurring opinion, Judge Johnson noted that although Brownies Creek Collieries v. Lingar, Ky.App., 794 S.W.2d 641 (1990), was cited by the claimant, it actually supported the decision of the Board. In that case, the award of total disability did not commence until November 27, 1985, the injured worker’s last day of work. Id. at 642.
Claimant now appeals to this Court, arguing that since the claims for the 1990 and 1991 injuries were litigated together and since the two injuries rendered him totally disabled, the decision in Campbell v. Sextet Mining Co., Ky., 912 S.W.2d 25 (1995), controls these facts. Therefore, he asserts that he is entitled to have benefits for both injuries computed as a percentage of total disability, pursuant to KRS 342.730(1), and paid for life. By contrast, Sun Glo (the 1990 employer) and the Special Fund present several arguments in support of the premise that this Court’s decision in Campbell was erroneous and should be reconsidered.
First, Sun Glo emphasizes that claimant was only partially disabled after the 1990 injury and that he did not, in fact, become totally disabled until after sustaining the subsequent injury in 1991. Therefore, he was not entitled to benefits for total disability until that time. Sun Glo argues that the extent of an employer’s liability for an injury cannot be enhanced by a subsequent injury which was incurred in a subsequent employment and that the Court’s basis for distinguishing Johnson was meaningless in view of the case’s holding. Furthermore, Sun Glo argues that the Court’s reliance on Beale v. Shepherd, Ky., 809 S.W.2d 845 (1991), and on prior eases which involved combined claims for occupational disease and injury was misplaced and that those cases do not support enhancing an employer’s liability by virtue of disability resulting from a subsequent injury which was incurred in a subsequent employment. Second, Sun Glo emphasizes that the partial disability caused by the 1990 injury clearly constituted a prior, active condition at the time the 1991 injury occurred. Any attempt by Campbell to treat it otherwise is contrary to the longstanding definition of the term. Third, Sun Glo argues that Campbell results in the inconsistent treatment of workers depending upon whether successive injuries which result in total disability are litigated together or sequentially. Finally, Sun Glo argues that if the Court reaffirms the decision in Campbell, the Special Fund should be held hable under the principle of “excess disability” for the difference between a 21% permanent, partial disability award, payable for 425 weeks, pursuant to KRS 342.730(l)(b), and whatever benefits are awarded for disability attributable to the 1990 injury. See KRS 342.120(6), (7).
The Special Fund agrees with Sun Glo that the decision in Johnson provides á blanket prohibition against the consideration of any subsequent disability to enhance the duration of an award. Furthermore, the Special Fund asserts that the ALJ’s award of lifetime benefits for the 1990 injury, despite the fact that claimant continued to work thereafter, was contrary to Osborne v. Johnson, Ky., 432 S.W.2d 800 (1968), as well as to Lingar, supra, at 642. Finally, the Special Fund asserts that the decision in Campbell “muddied the law of excess disability.”
The source of the controversy in this case, as in Campbell, is the fact that, although KRS 342.730 provides compensation for both partial and total disabilities which are permanent, awards for partial disability are payable át a lower maximum rate and for a shorter duration than awards for total disability. Permanent, partial occupational disability is compensable for 425 weeks, at the rate of 66%% of the worker’s average weekly wage multiplied by the percent of occupational disability, and limited to 75% of the state’s average weekly wage. KRS 342.730(l)(b). Whereas, permanent, total disability is com-pensable for life (so long as the worker remains totally disabled), at the rate of 66%% of the worker’s average weekly wage, and is limited to 100% of the state’s average weekly wage. KRS 342.730(l)(a); Stovall v. Williams, Ky.App., 675 S.W.2d 6 (1984). In Teledyne-Wirz v. Willhite, Ky.App., 710 S.W.2d 858 (1986), the court determined that the whole of the worker’s disability, including any noncompensable, prior, active disability, [607]*607was to be considered when determining whether benefits for a compensable disability should be awarded pursuant to KRS 342.730(l)(a) or (b). Id. at 859. Hence, before the decision in Campbell, a worker who was receiving (or entitled to receive) benefits for a partially disabling injury at the time he was rendered totally disabled by a subsequent injury was awarded lifetime benefits pursuant to KRS 342.730(l)(a), but only for the percentage of disability directly attributable to the last injury. In Mr. Campbell’s case, despite the fact that he had become totally, occupationally disabled, the lifetime award would have been only for a 10% occupational disability. In the instant case, the lifetime award would be only for a 42% occupational disability, despite the fact that the final injury rendered claimant totally, occupationally disabled.
In deciding Campbell, we noted that we were presented “with an extremely narrow issue.” Campbell, supra at 26. That issue was whether a worker was permitted to receive lifetime benefits pursuant to KRS 342.730(l)(a) for the combined effects of work-related injuries which occurred in different years and which rendered him totally occupationally disabled. Agreeing with the arguments advanced by the injured workers in seeking benefits for total disability, we held that:
since the ALJ in both of these appeals made factual findings of total disability that are supported by the record, we should enforce the legal effect of these findings and direct the entry of an award for lifetime benefits for the entire amount of disability not excluded as a prior active condition.
Id. However, further reflection makes it apparent that, in addressing the application of the holding to the facts of the case, we strayed from our “extremely narrow” holding when we indicated that disability caused by successive injuries which combine to render the worker totally disabled should be treated as though the injuries were suffered at the same time and also when we indicated that a rationale for the decision was the fact that the claims for the two injuries were prosecuted together. Id. at 27. To that extent, we erred. Nonetheless, we remain committed to the principle embodied in the holding, that a worker who is rendered permanently and totally disabled by a work-related injury which occurs during the compensable period of a prior, work-related injury is entitled to an award of lifetime benefits, computed pursuant to KRS 342.730(l)(a), for the entire amount of disability not excluded as a prior, active condition.
Claimant asserts that Campbell stands for the proposition that he is entitled to lifetime benefits for both the 1990 and 1991 injuries. However, as asserted by Sun Glo and the Special Fund and as recognized in Lingar, a worker is not entitled to benefits for total disability until such time as he becomes totally disabled. Likewise, a defendant may not be held liable for any additional occupational effect which results from the fact that a subsequent disabling injury is superimposed upon the injury for which the defendant is liable. Johnson, supra. Hence, notwithstanding any confusion created by our opinion in Campbell, we agree that the award for the 1990 injury may extend only for 425 weeks, with benefits payable at the 1990 rate pursuant to KRS 342.730(l)(b). To that extent, we affirm the decision of the Court of Appeals.
Contrary to the assertions made by the Special Fund, we are not persuaded that the holding of Campbell does violence to the principle of “excess disability.” KRS 342.120(6) provides that where the combined effect of a worker’s previous disability and a new injury results in a greater overall degree of disability that the latest injury, alone, would have caused, the employer is liable only for the percentage of disability attributable to the latest injury. Pursuant to KRS 342.120(7), that greater disability which results from the combined effect of the latest injury superimposed upon a previous disability is apportioned to the Special Fund. Generally, the term “excess disability” refers to the extent to which the whole of a worker’s disability from the combination of prior, active disability and the subject injury exceeds the sum of any prior, active disability and the disability which the subject injury, by itself, would have caused. The method for appor[608]*608tioning liability where a subsequent injury, by itself, would not have caused the worker’s entire disabihty was set forth in Young v. Fulkerson, Ky., 463 S.W.2d 118 (1971). See also Yocom v. Spalding, Ky., 547 S.W.2d 442 (1977), and Ligon Preparation Plant Co. v. Hamilton, Ky., 482 S.W.2d 762 (1972) which addressed the concept of excess disabihty with regard to KRS 342.120(3) and (4), (now embodied in KRS 342.120(6) and (7)).
In Campbell, as in the instant ease, a subsequent work-related injury rendered the worker totally disabled during the compensa-ble period for a prior, partially disabling work-related injury. Here, the sum of claimant’s 16% noncompensable disabihty and the percentages of occupational disabihty attributed to the 1990 and 1991 injuries totals 100%. However, since the 1991 injury rendered claimant totally, occupationally disabled, the occupational effect of the injury exceeded that which would have been the case had there been no prior disabihty. The occupational effect of the 1991 injury was twofold. First, together with the arousal of ongoing degenerative back problems, it accounted for 42% of claimant’s permanent, total disabihty. Second, due to the differences in KRS 342.730(l)(a) and (b), it caused the 1990 injury, which was being compensated as only a 42% permanent, partial disabihty, to become 42% of a permanent, total disabihty. It is this second effect which the Special Fund would have us ignore but which we determined, in Campbell, should be com-pensable.1 We are aware that, in doing so and in placing liability on the Special Fund pursuant to KRS 342.120(6) and (7), we broadened the concept of “excess disabihty.”2 However, we are not persuaded that we erred in doing so.
It has long been estabhshed that disabihty which exists prior to a work-related injury is viewed as prior, active, and noncom-pensable in the context of a claim for the injury, unless the injury, by itself, would have caused the entire disabihty. See Fulkerson, supra; Wells v. Bunch, Ky., 692 S.W.2d 806 (1985). However, as we observed in Beale v. Stratton, Ky., 779 S.W.2d 201, 202 (1989), the phrase “active disabihty” represents a judicial concept which has not appeared in the statutes. In Campbell, we not only recognized the principle that prior, active disabihty is noncompensable, we also recognized the longstanding principle that a worker who is rendered totally disabled by a combination of disabilities is entitled to be compensated for the whole of his disabihty. Where a prior injury is being compensated as a percentage of permanent, partial disability at the time the worker is rendered totally disabled by a subsequent work-related injury, the question to which our holding in Campbell is properly addressed is the extent to which disabihty attributable to the prior injury must be excluded from the total dis-abihty award. The Special Fund would have us exclude it as a percentage of the award for permanent, total disabihty, as did the Court of Appeals in this case. However, since we have reaffirmed the principle of Campbell, we conclude that the correct method for excluding the percentage of prior, active dis-abihty on these facts is to permit an offset against Trojan’s and the Special Fund’s liability pursuant to the award of total disabihty to the extent that benefits paid by the defendants pursuant to the partial disabihty award overlap the compensable period of the subsequent total disabihty award. In this way, there will be no duphcate compensation for the disabihty caused by the 1990 injury, each defendant will be held hable only for the disabihty which resulted from the injury for which it is hable, and claimant will be compensated for the whole of his disabihty at each point in time.
It is not disputed that claimant became totally, occupationally disabled as a result of the 1991 injury. Therefore, when the holding of Campbell is properly apphed to the present facts, claimant is entitled to an award pursuant to KRS 342.730(l)(a), as of the date of the 1991 injury, for the entire amount of his disabihty which is not excluded as a prior, active condition. The ALJ excluded a 16% disabihty for injuries which oe-[609]*609curred before 1990 and for which claimant had been fully compensated. That exclusion is undisputed. To the extent that permanent, partial disability benefits payable pursuant to the 1990 award overlap the period of total disability, they will offset Trojan’s and the Special Fund’s liability for benefits which would otherwise be due pursuant to the total disability award.
The decision of the Court of Appeals is hereby affirmed in part, and reversed in part, and the claim is hereby remanded to the ALJ for further proceedings which are consistent with this opinion.
STEPHENS, C.J., and GRAVES, JOHNSTON, LAMBERT and WINTERSHEIMER, JJ., concur.
COOPER, J., dissents by separate opinion.