DEITS, P. J.
Employer seeks review of an order of the Workers’ Compensation Board that determined the extent of claimant’s impairment. Employer argues that the Board erred in refusing to admit Exhibit 46, a “supplemental” medical arbiters’ report prepared at the request of employer, and Exhibit 47, a document entitled Guide to the Evaluation of Permanent Impairment. We affirm.
Claimant suffered a compensable low back strain in 1992. Employer initially accepted the claim as a nondisabling low back strain. In September 1992, employer reclassified the claim as disabling and accepted the central and left-side L5/S1 disc herniation. Claimant had surgery in September 1992. In January 1993, employer issued a notice of closure in which it granted claimant an award of compensation of 28.80 degrees for 9 percent unscheduled low back permanent partial disability (PPD). Claimant sought reconsideration of this award and, pursuant to OKS 656.268(7)(b), employer requested a three-member medical arbiters panel. The panel issued a report in August 1993, and, based on the findings of the panel, the Department of Consumer and Business Services issued an order on reconsideration granting claimant an award of 89.60 degrees for 28 percent unscheduled low back PPD.
In September 1993, employer requested a hearing on the order on reconsideration. On October 7, 1993, after employer’s request for hearing was filed, Dr. Dinneen, one of the three medical arbiters, signed off on a letter from employer’s attorney that purportedly clarified the initial medical arbiters’ report. At the hearing before the administrative law judge (ALJ), employer sought to introduce the letter as Exhibit 46. In addition, employer offered as evidence a publication by the American Medical Association, entitled Guide to the Evaluation of Permanent Disability.1 The ALJ denied [76]*76the admission of Exhibit 46 on the ground that it was subsequent medical evidence and was not admissible pursuant to ORS 656.268(7). The AU also denied the admission of Exhibit 47 on the ground that there was no evidence identifying where the Guide came from and no evidence demonstrating that it was any different from the information that the Department had given to the panel of arbiters to determine impairment. The Board agreed with the ALJ as to Exhibit 46, concluding that the statutes do not allow a “supplemental” or “clarifying” medical arbiter report, generated after the initial arbiter’s report and the order on reconsideration. The Board also concluded that the ALJ did not abuse his discretion in denying the admission of Exhibit 47.
Employer assigns error to the Board’s refusal to admit these two exhibits. The pertinent statutes are ORS 656.268(6)(e) and ORS 656.268(7)(g). ORS 656.268(6)(e)2 provides:
“Any medical arbiter report may be received as evidence at a hearing even if the report is not prepared in time for use in the reconsideration proceeding.”
ORS 656.268(7)(g) states:
“After reconsideration, no subsequent medical evidence of the worker’s impairment is admissible before the Department, the Workers’ Compensation Board or the courts for purposes of making findings of impairment on the claim closure.”3
[77]*77Employer relies on what it characterizes as the plain language of ORS 656.268(6)(e) to support its argument that Exhibit 46 is admissible. It contends that the reference to “any medical arbiter report” contemplates that there may be more than one report and that a later supplementation or clarification of the initial report clearly would come within those terms. In considering this argument, the Board concluded that it was unclear from the language of the statutes whether a “clarifying” or “supplemental” report from a medical arbiter or panel of arbiters, prepared after the initial report or after the order on reconsideration would be admissible. The Board then took into consideration the legislative history. After reviewing that history, the Board concluded that the legislature did not intend that such reports would be admissible.
We also conclude that the terms of the statute are ambiguous and that it is necessary to examine the legislative history of the statutes. See PGE v. Bureau of Labor and Industries, 317 Or 606, 859 P2d 1143 (1993). As explained in the Board’s opinion, the terms “any medical arbiter report” were added to the statute in 1991. The purpose of these changes, as evident from the legislative history, was to ensure that a medical arbiter’s report that was not prepared in time to be used in the reconsideration process could be considered in later proceedings reviewing the reconsideration order.4 The Board explained:
“[W]hen viewed in light of the purpose behind the amendment, it is apparent that the provision was added to permit admission of an initial medical arbiter report that was requested, yet not completed, before the statutory time-limit for reconsideration.
“The phrase ‘was not prepared in time for use at the reconsideration proceeding’ is consistent with such an interpretation. The statutory amendment further confirms that the provision is intended to permit admission of evidence at hearing of a medical arbiter report that is designed for use by the Appellate Unit during the reconsideration [78]*78process, but was not prepared in time for consideration prior to the issuance of the reconsideration order (whether actually or ‘deemed’ issued).
“Such an interpretation is likewise consistent with the intentions expressed regarding the medical arbiter and reconsideration process. In other, words, while the parties can no longer request opinions from their respective medical experts, permitting them to solicit supplemental opinions from the medical arbiter would tend to further the very same ‘dueling doctors’ and litigious system the legislature was attempting to avoid. Moreover, allowance of such a practice would undermine the objectivity of the arbiter and raise a question with regard to whether the arbiter had become a witness for one party or the other.
“Finally, to interpret ORS 656.268(6)(a) as allowing the admission of supplemental or clarifying medical arbiter reports would ignore the context in which the statute was amended. When both provisions are considered in light of the legislative history, we conclude neither provision allows the admission of a ‘supplemental’ or ‘clarifying’ medical arbiter’s report which was prepared at the request of either party. Therefore, we agree with the Referee that Exhibit 46 is not admissible.”5 (Footnotes omitted.)
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DEITS, P. J.
Employer seeks review of an order of the Workers’ Compensation Board that determined the extent of claimant’s impairment. Employer argues that the Board erred in refusing to admit Exhibit 46, a “supplemental” medical arbiters’ report prepared at the request of employer, and Exhibit 47, a document entitled Guide to the Evaluation of Permanent Impairment. We affirm.
Claimant suffered a compensable low back strain in 1992. Employer initially accepted the claim as a nondisabling low back strain. In September 1992, employer reclassified the claim as disabling and accepted the central and left-side L5/S1 disc herniation. Claimant had surgery in September 1992. In January 1993, employer issued a notice of closure in which it granted claimant an award of compensation of 28.80 degrees for 9 percent unscheduled low back permanent partial disability (PPD). Claimant sought reconsideration of this award and, pursuant to OKS 656.268(7)(b), employer requested a three-member medical arbiters panel. The panel issued a report in August 1993, and, based on the findings of the panel, the Department of Consumer and Business Services issued an order on reconsideration granting claimant an award of 89.60 degrees for 28 percent unscheduled low back PPD.
In September 1993, employer requested a hearing on the order on reconsideration. On October 7, 1993, after employer’s request for hearing was filed, Dr. Dinneen, one of the three medical arbiters, signed off on a letter from employer’s attorney that purportedly clarified the initial medical arbiters’ report. At the hearing before the administrative law judge (ALJ), employer sought to introduce the letter as Exhibit 46. In addition, employer offered as evidence a publication by the American Medical Association, entitled Guide to the Evaluation of Permanent Disability.1 The ALJ denied [76]*76the admission of Exhibit 46 on the ground that it was subsequent medical evidence and was not admissible pursuant to ORS 656.268(7). The AU also denied the admission of Exhibit 47 on the ground that there was no evidence identifying where the Guide came from and no evidence demonstrating that it was any different from the information that the Department had given to the panel of arbiters to determine impairment. The Board agreed with the ALJ as to Exhibit 46, concluding that the statutes do not allow a “supplemental” or “clarifying” medical arbiter report, generated after the initial arbiter’s report and the order on reconsideration. The Board also concluded that the ALJ did not abuse his discretion in denying the admission of Exhibit 47.
Employer assigns error to the Board’s refusal to admit these two exhibits. The pertinent statutes are ORS 656.268(6)(e) and ORS 656.268(7)(g). ORS 656.268(6)(e)2 provides:
“Any medical arbiter report may be received as evidence at a hearing even if the report is not prepared in time for use in the reconsideration proceeding.”
ORS 656.268(7)(g) states:
“After reconsideration, no subsequent medical evidence of the worker’s impairment is admissible before the Department, the Workers’ Compensation Board or the courts for purposes of making findings of impairment on the claim closure.”3
[77]*77Employer relies on what it characterizes as the plain language of ORS 656.268(6)(e) to support its argument that Exhibit 46 is admissible. It contends that the reference to “any medical arbiter report” contemplates that there may be more than one report and that a later supplementation or clarification of the initial report clearly would come within those terms. In considering this argument, the Board concluded that it was unclear from the language of the statutes whether a “clarifying” or “supplemental” report from a medical arbiter or panel of arbiters, prepared after the initial report or after the order on reconsideration would be admissible. The Board then took into consideration the legislative history. After reviewing that history, the Board concluded that the legislature did not intend that such reports would be admissible.
We also conclude that the terms of the statute are ambiguous and that it is necessary to examine the legislative history of the statutes. See PGE v. Bureau of Labor and Industries, 317 Or 606, 859 P2d 1143 (1993). As explained in the Board’s opinion, the terms “any medical arbiter report” were added to the statute in 1991. The purpose of these changes, as evident from the legislative history, was to ensure that a medical arbiter’s report that was not prepared in time to be used in the reconsideration process could be considered in later proceedings reviewing the reconsideration order.4 The Board explained:
“[W]hen viewed in light of the purpose behind the amendment, it is apparent that the provision was added to permit admission of an initial medical arbiter report that was requested, yet not completed, before the statutory time-limit for reconsideration.
“The phrase ‘was not prepared in time for use at the reconsideration proceeding’ is consistent with such an interpretation. The statutory amendment further confirms that the provision is intended to permit admission of evidence at hearing of a medical arbiter report that is designed for use by the Appellate Unit during the reconsideration [78]*78process, but was not prepared in time for consideration prior to the issuance of the reconsideration order (whether actually or ‘deemed’ issued).
“Such an interpretation is likewise consistent with the intentions expressed regarding the medical arbiter and reconsideration process. In other, words, while the parties can no longer request opinions from their respective medical experts, permitting them to solicit supplemental opinions from the medical arbiter would tend to further the very same ‘dueling doctors’ and litigious system the legislature was attempting to avoid. Moreover, allowance of such a practice would undermine the objectivity of the arbiter and raise a question with regard to whether the arbiter had become a witness for one party or the other.
“Finally, to interpret ORS 656.268(6)(a) as allowing the admission of supplemental or clarifying medical arbiter reports would ignore the context in which the statute was amended. When both provisions are considered in light of the legislative history, we conclude neither provision allows the admission of a ‘supplemental’ or ‘clarifying’ medical arbiter’s report which was prepared at the request of either party. Therefore, we agree with the Referee that Exhibit 46 is not admissible.”5 (Footnotes omitted.)
We agree with the Board’s reasoning and conclusions and, accordingly, hold that the Board did not err in upholding the denial of the admission of Exhibit 46.6 We also conclude that the Board did not err in denying the admission of Exhibit 47.
Affirmed.