Section 287.220.1 reads, in part:
If the previous disability or disabilities . . .and the last injury together result in total and permanent disability, . . . the employer at the time of the last injury shall be liable only for the disability resulting from the last injury considered alone and of itself. . .
Section 287.220.4 explains the timing of SIF payments in the event of successive work-related permanent disabilities:
If more than one injury in the same employment causes concurrent and consecutive permanent partial disability, compensation payments for each subsequent disability shall not begin until the end of the compensation period of the prior disability.
There is no dispute that employee suffered more than one injury in the same employment and that he thereby suffered concurrent and consecutive permanent disabilities. The question before us is did employee's third injury cause a permanent partial disability? If so, § 287.220.4 applies.
The SIF argues that the phrase, "causes concurrent and consecutive permanent partial disability" refers to the extent of disability resulting from the last injury alone. Employee does not directly address this argument. Rather, the employee argues that the reasoning of the SIF leads to a credit or offset not authorized by the Workers' Compensation Law. We accept the SIF argument.
The basis for our conclusion is found in the Missouri Supreme Court's opinion in Stewart v. Johnson, 398 S.W.2d 850 (Mo. banc 1966). The employee in Stewart suffered a work injury that combined with preexisting disabilities to render him permanently and totally disabled. The Stewart court explained the proper application of § 287.220.1 RSMo for apportioning liability between employer and the SIF. The court ruled it must "first consider only the disability resulting from the last injury; otherwise the words 'considered alone and of itself' are meaningless." Id., at 854 (emphasis added). Applying this rule, the court found that "the disability resulting from the last injury alone was a permanent partial disability." Id. The court then concluded that employer's liability is calculated with reference to § 287.190 RSMo, the permanent partial disability statute. Then, the remainder that would be due for permanent total disability is apportioned to the SIF.
We are convinced the same reasoning applies to the interpretation of § 287.220.4. The subsection refers to the extent of disability suffered in successive individual injuries. We conclude that the plain language of $\S 287.220 .4$ requires that we consider the disability caused by each injury alone to determine if that subsection applies.
The employee in the instant case, like the employee in Stewart, suffered a work injury that combined with preexisting disabilities to render him permanently and totally disabled. The administrative law judge properly applied the rule enunciated in Stewart and found that the last injury, alone and of itself, caused a permanent partial disability of 120 weeks.
Based upon the foregoing, we conclude that employee suffered more than one injury in the same employment that caused concurrent and consecutive permanent partial disability. Therefore, § 287.220.4 applies to determine the timing of the compensation payments in this case.