OPINION OF THE COURT
Gеne Beatty appeals from two orders of the Benefits Review Board of the United States Department of Labor that denied him benefits under the Federal Coal Mine Health and Safety Act of 1969, 30 U.S.C. §§ 901-45 (as amerided), and its applicable implementing regulations. The question presented in this appeal is whether Beatty is entitled to benefits if he is able to prove a total disability due to pneumoconiosis arising out of coal mining employment in combination with other nonrespiratory or nonpulmonary impairments. The Director, Office of Workers’ *995 Compensation Programs, argues 1 that a worker must be totally disabled due to a respiratory or pulmonary condition, and not due to other nonrespiratory or nonpulmonary ailments, in order to qualify for benefits. Although this is a close question, and one on which we have received little guidance from Congress, we conclude that the Director’s position is reasonable. Accordingly, we will affirm the orders of the Benefits Review Board.
I.
Gene Beatty began working in coal mining in 1968. He ran a cutting machine and worked as a mechanic. His last job was as a beltman, where his duties included keeping the belt clean, assembling and greasing it, shoveling coal that fell off of it, and rock dusting. In each of these jobs, his lungs were continuоusly exposed to coal dust.
Beatty worked for Danri Corporation and Triangle Enterprises until June 15, 1983, at which time he suffered a stroke. ■ He has not worked in the mines, or anywhere else, since that date. Until his stroke, his attendance record at work was good.
Beatty filed an application for benefits with the Department of Labor on June 17, 1985, pursuant to the federal black lung program. A formal hearing before an Administrative Law Judge (“ALJ”) was conducted in Pittsburgh, Pennsylvania on March 9, 1988, at which all parties were afforded a full opportunity to present evidence and argument. The ALJ found that Beatty was entitled to benefits.
The employer appealed from the ALJ’s decision awarding benefits and the Benefits Review Board (“BRB”) vacated the ALJ’s decision in part. The BRB ruled that Beatty had failed to establish a total disability as required by 20 C.F.R. § 718.204(e). 2 According to the BRB, a claimant must establish that the miner’s respiratory or pulmonary impairment is totally disabling and nonrespi-ratory or nonpulmonary impairments have no bearing on establishing total disability. The BRB therefore, remanded the case to the ALJ for consideration of the.total disability issue.
On remand, the ALJ conducted a review of the evidence of total disability consistent with the BRB’s ruling. The medical evidence is summarized as follows:
Dr. Petsonk: Beatty had pneumoconio-sis and this condition was related to his coal mine employment. Beatty had no limitations in walking, climbing stairs, lifting weights, or carrying weight any distance due to a pulmonary disease. Since Beatty’s stroke, he walks with a cane and a brace.
Dr. Silverman: Beatty was obviously totally and permanently disabled .with the sequelae of his previous stroke, and it was the primary focus of his disability. Beatty did have some coal mine exposure and respiratory symptoms. In his opinion, Beatty had pneumoconiosis which occurred as a result of his exposure to coаl dust in the mines which made, “some contribution” to his overall disability.
Dr. Alpem: Beatty had black lung disease and moderate ventilatory insufficiency. Although Beatty had arteriosclerotic *996 heart disease and residuals of a cerebral vascular accident with left hemiparesis, Beatty was totally disabled from his black lung disease.
Dr. Sachs: Beatty was totally and permanently disabled on' the basis of his stroke and, perhaps, his ■ arteriosclerotic heart disease. Beatty was not disabled due to a pulmonary condition. There was no evidence of pulmonary impairment due to pneumoconiosis.
ALJ Decision and Order on Remand at 2-3 (June 18, 1992).
The ALJ found the rеports of Drs. Pet--sonk and Sachs to be most credible. The ALJ reasoned that both of these physicians had conducted blood gas studies as well as vent studies to reach their Conclusions, while Drs. Silverman and Alpern did not have the benefit of blood gas results. Further, the ALJ noted that Dr. Sachs was board-certified in internal medicine as well as in pulmonary diseases, whereas Dr. Alpern was not board-certified in pulmonary diseases. Additionally, the ALJ explained that Dr. Sachs challenged the pulmonary function studies conducted by Dr. Alpern and felt that they were invalid because these studies did not meet the recommended criteria fоr such tests. The ALJ found that Dr. Sachs’ view was supported by the applicable regulations.
Based on this evidence, the ALJ found that Beatty was not entitled to benefits because Beatty was not disabled due to a respiratory or pulmonary condition, but rather due to other conditions including his stroke. On' appeal, the BRB affirmed the ALJ’s decision and denied Beatty benefits. This appeal followed.
II.
The Benefits Review Board had jurisdiction in this matter by virtue of 30 U.S.C. § 932(a), incorporating 33 U.S.C. § 921(b)(3). This Court has jurisdiction over Beatty’s appeal pursuant to 30 U.S.C. § 932(a), incorporating 33 U.S.C. § 921(c). Beatty appeals from a final order of the BRB dated Mаrch 25, 1994, and an interlocutory order dated November 20, 1991, which is now ripe for appeal.
III.
The federal black lung program, first enacted as Title IV of the Federal Coal Mine Health and Safety Act of 1969, Pub.L. No. 91-173, 83 Stat. 742 (1969), provides benefits to miners who have pneumoconiosis, a disease arising from exposure to coal dust during coal mine employment. Judge Mansmann’s scholarly opinion in
Bonessa v. United States Steel Corp.,
Beatty’s claim on appeal is that the ALJ and the BRB applied an incorrect legal standard in evaluating his claim for black lung benefits. A miner who is “totally disabled due to pneumoconiosis” may receive black lung benefits. 30 U.S.C. § 901(a); 20 C.F.R. § 718.204(a). According to Beatty, the Act and its implementing regulations require a fact finder to assess whether the miner is totally disabled by reference to the miner’s pneumoconiosis, his other respiratory or. pulmonary conditions, and his other non-respiratory or nonpulmonary impairments, not merely by reference to the miner’s respiratory or pulmonary impairments. Beatty calls his position a “full contribution” standard. The Director, Office of.Workers’ Compensation Programs, argues that a worker must be totally disabled due to pneumoconiosis and any other respiratory or pulmonary impairments, not due to other nonrespiratory or nonpulmonary ailments, in order to qualify for benefits. Beatty has dubbed this standard a “limited contribution” standard, and *997 we adopt this nomenclature as a useful shorthand. 3
In
Bonessa,
we determined that it wаs error for the BRB to require a claimant to prove that his total disability was due
solely
to pneumoconiosis.
Bonessa,
• Because Beatty’s claim involves an interpretation of a statute by an agency which administers it, to the extent that the statute is ambiguous, the question for the Court is whether the agency’s interpretation is based on a permissible construction of the statute.
Chevron, U.S.A., Inc. v. Natural Resources Defense Council, Inc.,
For purposes of Beatty’s claim, the Act provides that the term “total disability” has the meaning given it by the regulations of the Secretary of Labor provided the Secretary complies with certain enumerated restrictions. 30 U.S.C. § 902(f)(1) (1988). Beatty raises three arguments based on the Act, and two arguments based on the regulations, to supрort his position that a full contribution standard is appropriate. In addition, Beatty argues that the Director’s position is not entitled to deference. We will discuss each of these arguments seriatim.
A. The Act
1. ' 30 U.S.C. § 902(f)(1)(C)
Among the restrictions with which the Secretary must comply in promulgating regulations under the Act is that “such regulations shall not provide more restrictive criteria than those applicable under section 423(d) of Title 42.” 30 U.S.C. § 902(f)(1)(C). According to Beatty, the statutory command of *998 § 902(f)(1)(C) compels the conclusion that in assessing a claim for benefits under the Act an ALJ must look to all of a miner’s physical impairments in order to determine whether the minеr is totally disabled. Beatty points to 42.U.S.C. § 423(d)(2)(B) in support of his position.
Section 423(d)(2)(B), a section of the Social Security Act, states:
In determining whether an individual’s physical or mental impairment or impairments are of a sufficient medical severity that such impairment or impairments could be the basis of eligibility under this section, the Secretary shall consider the combined effect of all of the individual’s impairments without regard to whether any such impairment, if considered separately, would be of such severity. If the Secretary does find a medically severe combination of impairments, the combined impact of the impairments shall be considered throughout the disability determination process.
42 U.S.C. § 423(d)(2)(B) (1988) (emphasis' added). Beatty asserts that this statutory language prevents the Secretary, from promulgating regulations which determine total disability only by reference to respiratory or pulmonary impairments, and not by reference to-the totality of a miner’s impairments.
The Director’s position is that the Act was not intended to be a universal workers’ compensation program, but rather a compensation program that focuses on the miner’s respiratory or pulmonary conditions caused by the unique problems of coal mining. In support of this position, the Director' provides an alternative reading of the applicable statutory provisions. According to the Director, the “no more restrictive criteria” phrase in § 902(f)(1)(C) refers to 42 U.S.C. § 423(d)(2)(A) which states that:
An individual shall be determined to be under a disability only if his physical or mental impairment or impairments are of such severity that he is not only unable to do his previous work but cannot, considering his age, education, and work experience, engage in any other kind of substantial gainful work which exists in the national economy-
The Director asserts that in using the phrase “no more restrictive criteriа” Congress was simply concerned that the total disability standard take into account such factors as age, education, and work experience.
The Director’s position is borne out by the legislative . history concerning the 1972 amendments to the Act. The section of the Senaté report entitled “Definition of Total Disability” contains a statement of the Committee on Labor and Public Welfare’s intent in changing the definition of total disability:
By providing that criteria established under this definition shall not be more restrictive than those applicable under Section 223(d) of the Social Security Act, this section assures that due weight shall be given to such factors as age, education and previous work experience in the application of the revised definition of total disability, in order to insure as broad coverage as possible.
S.Rep. No. 743, 92nd Cong., 2d Sess. 16-17 (1972), reprinted in 1972 U.S.C.C.A.N. 2305, 2321. Accordingly, we cannot agree that § 902(f)(1)(C) decisively answers this question in favor of Beatty.
2. 30 U.S.C. § 931(b)(2)(C)
Beatty’s next argument is that § 931(b)(2)(C) of the Act supports his full contribution standard. The Act provides that after a certain period, claims for benefits would be shifted to state workers’ compensation programs approved as adequate under statutory standards. 30 U.S.C. § 931(a). Beatty notes that § 931(b)(2)(C) provides that a statе program can be approved if its standards are “substantially equivalent” to the federal standards. Beatty asserts that state workers’ compensation statutes have traditionally adhered to a full contribution standard. Accordingly, Beatty argues that § 931(b)(2)(C) evidences Congress’ expectation that the regulations implementing 30 U.S.C. § 902(f) would incorporate a fall contribution standard.
We believe that Beatty’s interpretation of this section is unwarranted. One of the reasons that. the. black lung benefits program was enacted was because few states provided *999 for such benefits. 30 U.S.C. § 901(a). Accordingly, it defies logic to argue that Congress intended to incorporate specific state causation standards into its Act. Further, despite Beatty's arguments to the contrary, 5 we can see no obvious flaw in the position espoused by the Director that the federal program merely provides minimum standards for the states to meet. As the Director points out, if the states wanted to be more generous in awarding benefits, they could be. Additionally, as the Director notes, the Department of Labor regulations make clear that the federal program provides only minimum standards for the states to meet. 20 C.F.R. § 722.146. Thus, we are unable to conclude that § 931(b)(2)(C) dictates the result Beatty desires in this case.
3. 30 U.S.C. § 902(f)(1)(A)
Beatty’s final statutory argument is based on § 902(f)(1)(A) of the Act which' provides that “a minér shall be considered totally disabled when ’pneumoconiosis prevents him or her from engaging in gainful employment requiring the skills and abilities comparable to [his or her past coal mine work].” (emphasis added). To support his argument, Beatty refers to the dictionary definition of the word “prevent,” which he states as “to stop, keep, or hinder [a person or other agent] from- doing something.” (citing The Oxford English .Dictionary (2d ed. 1989)). According to Beatty, the dictionary definition of “prevent” indicates that if a number of factors contribute to “preventing” a particular result — for example, if pneumoconiosis and various nonrespiratory and nonpulmo-nary impairments “prevent” a miner from working — then any one of the factors may be said to “prevent” the result. .
We find that this linguistic argument is of no avail to Beatty. Indeed, it merely begs the question of how to construe the phrase “when pneumoconiosis prevents.” The phrase “when pneumoconiosis prevents” is ambiguous because it does not state the precise role pneumoconiosis must play in disabling the miner. One possible interpretation is that pneumoconiosis must be the solе cause of the miner’s inability to engage in his past work. ■ We rejected this notion in
Bonessa,
B. The Regulations
Beatty’s next. claim is that the relevant regulations implementing the Act require a full contribution standard. He advances two arguments to support his contention. First, he asserts that the history of the successive regulations, particularly the interim regulations governing the black lung program, die-, tate a full contribution standard. Second, Beatty asserts that the relevant regulations parallel the language of the statute itself and dictate a full contribution standard. We are unpersuaded by Beatty’s arguments.
The Black Lung Benefits Reform Act of 1977 (BLBRA) granted the Secretary of Labor authority to establish total disability regulations for certain classes of cases. Pending issuance of the new permanent regulations,. the BLBRA provided for interim regulations applying standards different from (and more generous than) the regulations that had previously been in effect.
6
Pittston Coal Group v. Sebben,
Whether or not the Director has accurately portrayed Congress’ intent in authorizing the interim regulations, we find that'the interim regulations have little relevance to the issue here. The issue befоre the Court is the proper interpretation of the Secretary of Labor’s permanent regulations. Accordingly, we find Beatty’s first argument to be of little value.
Beatty’s second argument, that the relevant regulations parallel the language of the Act itself and dictate a contribution standard, is simply belied by the text of the regulations. The relevant Department of Labor regulation states that “total disability may ... be found if a physician exercising reasoned medical judgment ... concludes that a miner’s respiratory or pulmonary condition prevents or prevented the miner from engaging in employment_” 20 C.F.R. § 718.204(c)(4). Further, the regulations state that proof that a miner suffers from a totally disabling respiratory or pulmonary impairment is “not, by itself sufficient to establish that the miner’s impairment is or was due to pneumoconiosis.” 20 C.F.R. § 718.204(c)(5). Accordingly, the regulations require the miner to establish that.he has pneumoconiosis, and also that he is totally disabled. The Act, by contrast, simply states that a miner is totally disabled if “pneumoco-niosis prevents him or her from engaging in gainful employment_” 30 U.S.C. § 902(f)(1)(A). The Act does not further define how to analyze the phrase when “pneu-moconiosis prevents.” Thus, the regulations set out a more specific formula for resоlving these claims than does the Act, a formula that allows a claimant to include all respiratory or pulmonary impairments in establishing total disability. The regulations do not contemplate inclusion of nonrespiratory or nonpulmonary impairments as Beatty asserts.
To bolster his second argument, Beatty asserts that only his construction of the Part 718 regulations (a full contribution construction) makes them consistent with the statute. Beatty notes that regulations must be construed, if at all possible, to be consistent with the governing statute.
See Public Employees Retirement System v. Betts,
At best, Beatty’s statutory and regulatory arguments disclose another possible construction of the Act and its implementing regulations. Beatty has not demonstrated that the Act unambiguously dictates a full contribution standard. Similarly, Beatty has not demonstrated that the Director’s interpretation of the applicable regulations is “plainly erroneous” or “inconsistent” with those regulations. Accordingly, we are inclined to uphold the Director’s position.
G. Whether Deference is Appropriate
Beatty’s final contention is that the Director’s position is not entitled to deference. To support this position, Beatty advances four arguments. First, Beatty argues that because the Director is merely a delegatee of
*1001
the Secretary, the Secretary’s interpretation must prevail over the Director’s if the two are in conflict. He cites
Elliot Coal Mining Co. v. Director, Office of Workers’ Compensation Program,
Unfortunately for Beatty, he fails to demonstrate any conflict between the Dirеctor’s position and that of the Secretary.' Beatty argues that the Part 718 regulations (i.e., the Secretary’s regulations), embody a full contribution standard and therefore the Director’s interpretation of these regulations is in conflict with the Secretary’s interpretation. As we have explained, however, Beatty has not demonstrated that the Part 718 regulations embody a full contribution standard. Accordingly, Beatty’s first argument against according the Director deference is fatally flawed.
Beatty’s next argument is that deference to an administrative agency’s construction of a statute is inappropriate if a court, employing traditional tools of statutory construction, is able to discern Congress’ intent in enacting the measure. For this proposition, Beatty cites
Immigration and Naturalization Service v. Cardoza Fonseca,
Once again, however, Beatty’s argument is fatally flawed. As we have previously determined, the text of the Act does not unambiguously embrace a full contribution standard. We are not able to discern Congress’ precise intent from the language presented to us in the Act. Accordingly, Beatty’s argument cannot succeed.
Beatty’s third argumеnt is that the Senate Committee report accompanying the 1977 Reform Act, in discussing its understanding of “total disability” under the Act, expressed the “expectation that the Secretary of Labor will promulgate standards which give the benefit of any doubt to the coal miner.” S.Rep. No. 209, 95th Cong., 1st Sess. 13 (1977). Further, Beatty argues that the agency itself assumed this obligation by incorporating this expectation into its regulations at 20 C.F.R. § 718.3(c) (1993).
Both the full contribution standard urged by Beatty and the limited contribution standard urged by the Director allow impairments other than pneumoconiosis or its se-quelae to be counted toward the definition of total disability. Admittedly, Beatty’s position is more generous toward miners than that of the Director. We do not think, however, that the Director runs afoul of his duty of establishing regulations which give the benefit of the doubt to the claimants by promulgating and implementing regulations that place some limits on the kinds of impairments that a claimant can count. towards establishing a total disability. Accordingly, we are unpersuaded by Beatty’s argument.
Beatty’s final argument is that the Director’s current reading of the statute and the Part 718 regulations is inconsistent with her prior constructions and is merely expressed in a litigating position. Beatty argues that under such circumstanсes it is inappropriate to accord the Director deference. Beatty cites
Bowen v. Georgetown University Hospital,
Beatty has not demonstrated any inconsistency in the position taken by the Director concerning the current Department of Labor regulations. At best, Beatty can demonstrate some inconsistency between the interpretation of DOL’s permanent regulations and its interim regulations. As previously discussed, however, the interim regulations do not concern us here. Accordingly, we are unpersuaded by Beatty’s argument that the Director’s position is not entitled to deference.
IV.
In addition to Beatty’s inability to provide a persuasive reason not to defer to the Director’s position, we must point out that adhering to Beatty’s view would produce.undesirable consequences. Under Beatty’s view, a miner who has pneumoconiosis, but whose total disability is only 10% attributable •to this disease, would be able to recover benefits if his completely unrelated physical problems (such as a stroke) created 90% of *1002 his total disability. While a persuasive argument can be made (and is made by the Director) that the state of current medical science makes it difficult to distinguish between pneumoconiosis and other respiratory or pulmonary diseases, it is untenable that physical impairments that affect other parts of the. body (such as a stroke) would often be indistinguishable from pneumoconiosis. 8 While neither the Director’s view nor Beatty’s view will likely lead to a perfect test for compensation, we find the Director’s view to be reasonable. Accordingly, we reject Beatty’s claim on appeal that a miner is entitled to benefits if he or she is able to prove a total disability due to pneumoconiosis arising out of coal mining employment in combination with other unrelated nonrespiratory or non-pulmonary impairmеnts. 9
In announcing the position that we set forth today, we align ourselves with a recent decision of the Court of the Appeals for the Fourth Circuit which decided this very question. In that case,
Jewell Smokeless Coal Corporation v. Junior Street,
For the foregoing reasons, we will affirm the orders of the Benefits Review Board.
Notes
. Danri Corporation and Triangle Enterprises advance the same argument as the Director. For expediency purposes we will simply refer to their collective position as that of the Director. With respect to any deference arguments made throughout the opinion concerning the Director, however, we obviously do not mean to suggest that Danri Corporation and Triangle Enterprises should be accorded any deference.
Additionally, counsel for Danri Corporation and Triangle Enterprises informed this Court at oral argument that it is Triangle Enterprises who is the relevant employer for purposes of this appeal. Since this assertion was unchallenged by Beatty, we accept it as accurate.
. Section 718.204(c)(4), the section under scrutiny in this case, states:
Where total disability cannot be established under paragraphs (c)(1), (c)(2) or (c)(3) of this section, or where pulmonary function tests and/or blood-gas studies are medically contraindicated, total disability may nevertheless be found if a physician exercising reasoned medical judgment, based on medically acceptable clinical and laboratory diagnostic techniques, concludes that a miner’s respiratory or pulmonary condition prevents or prevented the miner from engaging in employment as described in paragraph (b) of this section[.]
20 C.F.R. § 718.204(c)(4) (1993).
. The standard is one of "limited contribution” because it allows impairments other than pneu-moconiosis to “contribute” towards proving a total disability (i.e., other respiratory and pulmonary impairments), but is "limited” because it does not allow nonrespiratory or nonpulmonary impairments to be counted unless they are caused by pneumoconiosis.
We wish to make perfectly clear that the Director does not dispute that nonrespiratory and nonpulmonary impairments which are caused by pneumoconiosis count toward the definition of total disability. Indeed, the definition of pneu-moconiosis was expanded in 1978 to include its “sequelae.” 30 U.S.C. § 902(b). A "sequela" is "any lesion [loss of function] or affection [affliction] following or caused by an attack of disease." Dorland’s Illustrated Medical Dictionary 1509 (27th ed. 1988). Accordingly, impairments caused by pneumoconiosis, respiratory or not, count towards the definition of total disability. The Director takes issue with counting nonrespi-ratory and nonpulmonary impairments that are unrelated to pneumoconiosis.
. Congress has delegated rule-making powers under the Act to the Secretary of Labor. The Secretary of Labor has redelegated all of his powers under the Act to the Director. Because the Director is the Secretary's delegate with respect to the Act, we owe deference to the Director’s interpretation.
Bethlehem Mines,
. Beatty makes the textual argument that because Congress used the phrase “substantially equivalent to” instead of “no more restrictive , .than” in § 931(b)(2)(C), it could not have contemplated approving more generous state standards. We do not believe Congress intended to place a ceiling on state benefits by using' the “substantially equivalent” phraseology.
. The regulations previously in effect were the permanent regulations established by the Secretary of the Department of Health, Education and Welfare.
. Beatty also argues that
Bonessa
resolves this dispute by declining to construe total disability "due to” pneumoconiosis, 20 C.F.R. § 718.204(a), to mean that pneumoconiosis must be the sole cause of a miner’s total disability. As we noted previоusly, the
Bonessa
decision focused on the proper standard of causation (whether sole cause or substantial contributing cause was the correct standard). The
Bonessa
court did not decide the question of the range of other impairments pneumoconiosis could combine with to create a total disability. Further, in its opinion, the
Bonessa
court hinted at the proper resolution of the case before us when it commented that "[w]ithout a doubt, a miner seeking benefits must show that he is totally disabled not merely by a respiratory or pulmonary condition but by pneumoconiosis."
Bonessa,
. Beatty argues that some nonrespiratory and nonpulmonary impairments are difficult to distinguish from pneumoconiosis. While this may be the case in some instances, we do not .believe these instances to be dispositive.
. Because we reject Beatty’s claim that the Board applied an inappropriate legal standard, we need not reach his other argument that the evidence of record, if scrutinized under Beatty's standard, obliges a judgment from this Court directing an outright award of benefits.