OPINION
I. Introduction
In this appeal we are asked to determine whether, under the Texas Workers’ Compensation Act, a worker’s compensa *79 tion carrier is entitled, as a matter of law, to a proportionate reduction in the award of supplemental income benefits equal to the percentage of reduction of impairment income benefits for a prior compensable injury. We reverse the judgment of the trial court and render judgment that Appellant is entitled, as a matter of law, to contribution in the amount of an ll/17ths reduction of Appellee’s supplemental income benefits.
II. Factual and Procedural Background
Appellee John H. Moore filed a workers’ compensation claim for a compensable back injury suffered on June 29, 1994, while in the course and scope of his employment with General Motors. Appellant ■ Insurance Company of Pennsylvania requested that the Texas Workers’ Compensation Commission (“Commission”) determine the percentage of contribution for a prior compensable injury sustained by Ap-pellee on May 21,1991.
A benefit contested-case hearing was held to determiné the amount by which Appellant was entitled to reduce Appellee’s impairment income benefits (IIBs) and supplemental income benefits (SIBs) based upon the prior compensable injury. The hearing officer found Appellant was entitled to reduce Appellee’s IIBs by ll/17ths based upon the earlier compensable injury. However, the hearing officer did not allow Appellant to reduce Appellee’s SIBs for the prior injury.
The decision of the hearing officer was appealed to the Commission Appeals Panel. The Appeals Panel failed to act on the appeal. Consequently, the decision of the contested case hearing officer became final by operation of law. 1
Appellant filed suit in State district court challenging the Commission Appeals Panel’s determination that it was not entitled to a proportionate reduction of SIBs for the prior compensable injury. 2 The parties then filed cross motions for summary judgment, which called into question the interpretation of section 408.084 of the Texas Workers’ Compensation Act. Tex. Lab.Code Ann. § 408.084 (Vernon 1996). Appellant’s motion requested the trial court to determine that section 408.084 entitled it to a proportionate reduction of SIBs in the same proportion that was found applicable to IIBs. Appellee moved for summary judgment on the grounds that Appellant had not properly preserved the issue of the amount of contribution in its pleadings and that Appellant was not entitled to a proportionate reduction of SIBs. The trial court denied Appellant’s motion for summary judgment and granted Appellee’s motion without specifying the basis for its ruling.
III. Issues
In two issues, Appellant contends the trial court erred in granting Appellee’s motion for summary judgment and denying its motion for summary judgment because (1) as a matter of law, Appellant is entitled to an ll/17ths contribution towards SIBs and (2) that Appellant’s pleadings adequately preserved the issues presented to the Commission.
IV. Discussion
A. Preservation of Error
At the outset, we agree with Appellant that it adequately preserved for appeal the sole issue .in this case: whether Appellant is entitled, as a matter of law, to *80 a proportionate reduction of SIBs equal to the percentage of reduction awarded for IIBs for Appellee’s prior injury. This issue was raised and tried via the parties’ cross-motions for summary judgment. We reject Appellee’s contention that the amount of contribution was not preserved by Appellant’s pleadings.
B. Standard of Review—Cross-motions for Summary Judgment
When both sides move for summary judgment and the trial court grants one motion and denies the other, we review both sides’ summary judgment evidence and determine all questions presented.
FM Properties Operating Co. v. City of Austin,
The material facts in this case are not in dispute. The sole issue presented centers on the interpretation of section 408.084. Because this case involves a question of statutory interpretation, ‘ it presents a pure question of law that is a proper matter for summary judgment.
Legend Airlines, Inc. v. City of Fort Worth,
C. Impairment and Supplemental Income Benefits
An employee receives impairment income benefits according to the employee’s impairment rating, which is the percentage of the whole body’s permanent impairment.
See
Tex.Lab.Code Ann. § 401.011(24) (Vernon 1996 & Supp.2001);
Rodriguez v. Serv. Lloyds Ins. Co.,
The impairment rating may also qualify an employee for supplemental income benefits, which provide long-term disability compensation.
See
Tex. Lab. Code Ann. § 408.142;
Rodriguez,
*81 D. Section 408.084 of the Texas Labor Code
Section 408.084 of the Texas Workers’ Compensation Act sets forth the statutory basis for an insurance carrier to request the reduction of impairment income benefits and supplemental income benefits as a result of documented impairment from an earlier compensable injury. Tex. Lab.Code Ann. § 408.084. Specifically, it provides:
(a) At the request of the insurance carrier, the commission may order that impairment income benefits and supplemental income benefits be reduced in a proportion equal to the proportion of a documented impairment that resulted from earlier com-pensable injuries.
(b) The commission shall consider the cumulative impact of the compensa-ble injuries on the employee’s overall impairment in determining a reduction under this section.
Id.
E. Application
In the present case, the hearing officer’s findings of fact show that, on May 23, 1991, Appellee sustained a compensable back injury and had a two-level fusion at L4-5 and L5-S1. Appellee was awarded an 11 percent whole body impairment rating from the surgery performed as a result of the 1991 injury. Appellee returned to work following his 1991 injury and was not awarded any SIBs with regard to that injury. On June 29, 1994, Appellee sustained a new injury to his low back, which involved a 360 degree fusion at L4-5 and L5-S1. For the 1994 injury, Appellee was assigned a 17 percent whole body impairment rating by Dr. Juan Capello, M.D., a commission-designated doctor. The hearing officer further found that, after his surgery for the 1994 injury, Appellee was unable to return to work at his pre-injury wages, and that the cumulative impact of impairment from the two injuries caused Appellee to be unable to be gainfully employed at his pre-injury wages. The hearing officer determined that 11 percent of the 17 percent impairment rating for the 1994 injury was attributable to the 1991 injury. Based on this finding, the hearing officer determined that Appellant was entitled to an ll/17ths proportionate reduction of IIBs. The hearing officer further found that “the cumulative impact of impairment and [Appellee’s] subsequent employment history may mean that [Appellee] would no longer be entitled to [SIB]s from a 1991 compensable injury [and, consequently, Appellant] is not entitled to any contribution from the 1991 injury for [SIB]s.”
From these findings of fact, the hearing officer concluded, as a matter of law, that Appellant was entitled to an ll/17ths proportionate reduction of IIBs but that Appellant was not entitled to any proportionate reduction of SIBs for the prior compensable injury. Appellant contends that the trial court erred by entering judgment that sustained the hearing officer’s legal conclusion and maintains that section 408.084 requires, as a matter of law, that SIBs be reduced in the same proportion that was found applicable to IIBs.
Our only guidance in interpreting section 408.084 is provided by Commission Appeals Panel decisions which construe the statute. The construction given to a statute by the administrative agency charged with its execution
3
is entitled to
*82
serious consideration if it is reasonable, consistent with the Legislature’s intent, and does not contradict the plain language of the statute. Tex. Gov’t Code Ann. § 311.023(6) (Vernon 1998);
Tex. Water Comm’n v. Brushy Creek Mun. Util. Dist.,
Moreover, Texhs Supreme Court jurisprudence mandates that we enforce the plain meaning of an unambiguous statute.
Tune v. Tex. Dep’t of Pub. Safety,
Upon review of relevant Commission Appeals Panel decisions, including those cited by both Appellant and Appellee, we have been unable to find any decision that has upheld a hearing officer’s contribution award to an insurance carrier based on a prior compensable injury, where the officer reduced SIBs in a different proportion than IIBs. However, the Commission Appeals Panel has addressed this precise issue on at least two prior occasions and has held to the contrary. In a 1994 decision, the Commission Appeals Panel held that section 408.084 is equally applicable to IIBs and SIBs and recognized that section 408.084 specifically provides that both types of income benefits are to be reduced in “a proportion,” indicating only one proportion. Tex. Work. Comp. Comm’n, Appeal No. 94787,
Appellee contends that these cases were “reversed” by a 1999 Panel decision, citing Tex. Work. Comp. Comm’n, Appeal No. 990237,
Accordingly, we hold that section 408.084 of the Texas Labor Code requires IIBs and SIBs be reduced in one proportion for purposes of contribution for a pri- or compensable injury and that the proportion shall be equal to the proportion of the previously documented impairment resulting from that injury. We, therefore, hold that the trial court erred in granting summary judgment to Appellee to the extent that it upholds the hearing officer’s decision that contribution should only apply to IIBs and not SIBs in this case. Application of our holding requires that, for purposes of contribution, Appellant is entitled, as a matter of law, to an ll/17ths proportionate reduction of Appellee’s award of IIBs and SIBs. We sustain Appellant’s first issue.
V. Conclusion
Having sustained Appellant’s first issue, it is unnecessary to reach Appellant’s additional grounds for review. We reverse the trial court’s judgment and render judgment that Appellant is entitled, as a matter of law, to contribution in the amount of an ll/17ths reduction of Appellee’s supplemental income benefits. 4
Notes
. See Tex.Lab.Code Ann. § 410.204(c) (Vernon 1996) and Commission Rule 143.5(b) (located at www.twcc.state.tx.us).
. See Tex.Lab.Code Ann. § 410.252.
. The Texas Workers’ Compensation Commission is an administrative agency provided for proper execution of the Texas Workers’ Compensation Act.
Middleton v. Tex. Power & Light Co.,
. When considering cross-motions for summary judgment in which both parties have sought final judgment relief, a court of appeals may reverse and render the judgment that the trial court should have rendered.
CU Lloyd’s of Tex. v. Feldman,
