COFFEY, Circuit Judge.
Petitioner Fred Newell was denied benefits under the Black Lung Benefits Act, 30 U.S.C. §§ 901-945 (1982), after the ALJ held a hearing on his claim. The ALJ’s denial was affirmed on direct appeal to the Benefits Review Board and again on rehearing. Newell now appeals to this court, contending that the AU applied an inappropriate standard of causation to his claim.
I.
Newell first applied for black lung benefits on June 30, 1980.
After an initial hearing and remand not relevant here, a hearing was held on July 9, 1987. At that time, Newell was 69 years old and suffered from a number of physical ailments, including asthma, bronchitis, obesity, and intermittent congestive heart failure.
To qualify for black lung benefits, a miner must show that he or she is “totally disabled due to pneumoconiosis.” 20 C.F.R. § 718.204(a). This question is analyzed in the following steps: (1) Does the miner suffer from pneumoconiosis? (2) Did the pneumoconiosis arise out of coal mine employment? (3) Is the miner totally disabled? and finally, (4) Is the miner’s total disability “due to” pneumoconiosis?
See Hawkins v. Director, OWCP,
907 F.2d 697, 699 (7th Cir.1990). In this case, the AU held that Newell met the first three steps of the benefits analysis,
but not the fourth.
The issue on appeal, therefore, is whether Newell proved that his total disability was
due to
pneumoconiosis. To the extent that the answer relies on findings of fact, we defer to the AU and affirm his decision if it was based on substantial evidence.
See, e.g., Strike v. Director, OWCP,
817 F.2d 395, 406 (7th Cir.1987). Issues of law, however, are reviewed
de novo. Hawkins,
907 F.2d at 700.
In holding that Newell failed to establish causation, the AU concluded that the only medical evidence linking Newell’s pneumo-coniosis with his total disability was equivocal and insufficient to carry Newell’s burden of proof. Newell’s treating physician, Dr. Thompson, wrote Newell’s counsel a letter in which he summarized his treatment of Newell over the years. In the letter, Dr. Thompson concluded:
In summary, this patient is certainly disabled with chronic lung disease, some part asthma, some part restrictive lung disease,
which could be from the pneu-moconiosis
from being exposed to the rock dust and coal in the coal mine, and some COPD which is chronic obstructive lung disease from previous history of smoking many, many years ago. However, after 10 years of not smoking and this patient has not smoked for 25 years, it is highly unlikely that the cigarette smoking that he previously had done is
contributing to this problem at the present time.
(emphasis added). The AU concluded that this evidence was insufficient to prove that Newell’s pneumoconiosis was “by itself, totally disabling.”
It should be noted that in addition to this “equivocal” evidence linking Newell’s total disability with pneumoconiosis, the record included a medical report from Dr. Campbell who concluded that Newell’s breathing disorder was caused by cigarette smoking,
not pneumoconiosis. Dr. Campbell’s diagnosis was based on his finding that New-ell’s pulmonary disability was of an obstructive, rather than restrictive, nature; cigarette smoking is closely associated with obstructive impairments, while pneumoco-niosis leads to restrictive impairments.
On appeal to the Benefits Review Board, Newell argued that the AU erred in applying the “by itself, totally disabling” standard to his benefits claim.
Newell suggested that the appropriate standard was contributing cause, but the Board, citing
Wilburn v. Director, OWCP,
11 Black Lung Rep. 1-135 (1988), rejected this argument and affirmed the AU’s decision. Newell filed a petition for rehearing, arguing that several federal appellate courts had rejected
Wilburn’s
“in and of itself totally disabling” standard. The Board concluded, however, that the Seventh Circuit had not yet spoken on the issue, and that the Board would therefore not disturb the standard of causation the AU had earlier applied.
II.
Newell correctly notes that in the interim between the Board’s reconsideration of his claim and the filing of appellate briefs here, this court has followed the other circuits in rejecting
Wilburn. See Shelton v. Director, OWCP,
899 F.2d 690 (7th Cir.1990);
Hawkins,
907 F.2d 697. He argues that the case must be remanded to the AU because Dr. Thompson’s medical report meets the “necessary cause” standard announced in
Shelton
and therefore the AU will award benefits. The Director, however, contends that remand is unnecessary because even under the
Shelton
standard, Newell could not prevail.
Although the AU applied a causation standard that we have recently rejected, this error may be harmless if it is clear that Newell could not prove that his total disability was attributable to pneumoconio-sis. While the regulations do not specifically provide us with grounds to hold an AU’s error harmless, we have not been reluctant to rely on harmless error when a remand would be futile (and costly).
See, e.g., Collins v. Old Ben Coal Co.,
861 F.2d 481, 489 (7th Cir.1988) (failure to provide specific analysis was harmless error given lack of medical evidence to support claim);
Knudtson v. Benefits Review Bd.,
782 F.2d 97, 101 (7th Cir.1986) (assuming AU erred, error was harmless in light of respondent’s rebuttal evidence). All of the members of this panel agree that the harmless error standard may be employed in this case, but we differ on the results of its application.
In my view, the evidence in this case is equivocal at best. Dr. Thompson, Newell’s treating physician, concluded in his letter that Newell’s total disability
could be due to
pneumoconiosis. This case therefore differs significantly from both
Shelton
and
Hawkins
in which there existed affirmative, unequivocal evidence supporting a
finding of causation. The record in
Shelton
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COFFEY, Circuit Judge.
Petitioner Fred Newell was denied benefits under the Black Lung Benefits Act, 30 U.S.C. §§ 901-945 (1982), after the ALJ held a hearing on his claim. The ALJ’s denial was affirmed on direct appeal to the Benefits Review Board and again on rehearing. Newell now appeals to this court, contending that the AU applied an inappropriate standard of causation to his claim.
I.
Newell first applied for black lung benefits on June 30, 1980.
After an initial hearing and remand not relevant here, a hearing was held on July 9, 1987. At that time, Newell was 69 years old and suffered from a number of physical ailments, including asthma, bronchitis, obesity, and intermittent congestive heart failure.
To qualify for black lung benefits, a miner must show that he or she is “totally disabled due to pneumoconiosis.” 20 C.F.R. § 718.204(a). This question is analyzed in the following steps: (1) Does the miner suffer from pneumoconiosis? (2) Did the pneumoconiosis arise out of coal mine employment? (3) Is the miner totally disabled? and finally, (4) Is the miner’s total disability “due to” pneumoconiosis?
See Hawkins v. Director, OWCP,
907 F.2d 697, 699 (7th Cir.1990). In this case, the AU held that Newell met the first three steps of the benefits analysis,
but not the fourth.
The issue on appeal, therefore, is whether Newell proved that his total disability was
due to
pneumoconiosis. To the extent that the answer relies on findings of fact, we defer to the AU and affirm his decision if it was based on substantial evidence.
See, e.g., Strike v. Director, OWCP,
817 F.2d 395, 406 (7th Cir.1987). Issues of law, however, are reviewed
de novo. Hawkins,
907 F.2d at 700.
In holding that Newell failed to establish causation, the AU concluded that the only medical evidence linking Newell’s pneumo-coniosis with his total disability was equivocal and insufficient to carry Newell’s burden of proof. Newell’s treating physician, Dr. Thompson, wrote Newell’s counsel a letter in which he summarized his treatment of Newell over the years. In the letter, Dr. Thompson concluded:
In summary, this patient is certainly disabled with chronic lung disease, some part asthma, some part restrictive lung disease,
which could be from the pneu-moconiosis
from being exposed to the rock dust and coal in the coal mine, and some COPD which is chronic obstructive lung disease from previous history of smoking many, many years ago. However, after 10 years of not smoking and this patient has not smoked for 25 years, it is highly unlikely that the cigarette smoking that he previously had done is
contributing to this problem at the present time.
(emphasis added). The AU concluded that this evidence was insufficient to prove that Newell’s pneumoconiosis was “by itself, totally disabling.”
It should be noted that in addition to this “equivocal” evidence linking Newell’s total disability with pneumoconiosis, the record included a medical report from Dr. Campbell who concluded that Newell’s breathing disorder was caused by cigarette smoking,
not pneumoconiosis. Dr. Campbell’s diagnosis was based on his finding that New-ell’s pulmonary disability was of an obstructive, rather than restrictive, nature; cigarette smoking is closely associated with obstructive impairments, while pneumoco-niosis leads to restrictive impairments.
On appeal to the Benefits Review Board, Newell argued that the AU erred in applying the “by itself, totally disabling” standard to his benefits claim.
Newell suggested that the appropriate standard was contributing cause, but the Board, citing
Wilburn v. Director, OWCP,
11 Black Lung Rep. 1-135 (1988), rejected this argument and affirmed the AU’s decision. Newell filed a petition for rehearing, arguing that several federal appellate courts had rejected
Wilburn’s
“in and of itself totally disabling” standard. The Board concluded, however, that the Seventh Circuit had not yet spoken on the issue, and that the Board would therefore not disturb the standard of causation the AU had earlier applied.
II.
Newell correctly notes that in the interim between the Board’s reconsideration of his claim and the filing of appellate briefs here, this court has followed the other circuits in rejecting
Wilburn. See Shelton v. Director, OWCP,
899 F.2d 690 (7th Cir.1990);
Hawkins,
907 F.2d 697. He argues that the case must be remanded to the AU because Dr. Thompson’s medical report meets the “necessary cause” standard announced in
Shelton
and therefore the AU will award benefits. The Director, however, contends that remand is unnecessary because even under the
Shelton
standard, Newell could not prevail.
Although the AU applied a causation standard that we have recently rejected, this error may be harmless if it is clear that Newell could not prove that his total disability was attributable to pneumoconio-sis. While the regulations do not specifically provide us with grounds to hold an AU’s error harmless, we have not been reluctant to rely on harmless error when a remand would be futile (and costly).
See, e.g., Collins v. Old Ben Coal Co.,
861 F.2d 481, 489 (7th Cir.1988) (failure to provide specific analysis was harmless error given lack of medical evidence to support claim);
Knudtson v. Benefits Review Bd.,
782 F.2d 97, 101 (7th Cir.1986) (assuming AU erred, error was harmless in light of respondent’s rebuttal evidence). All of the members of this panel agree that the harmless error standard may be employed in this case, but we differ on the results of its application.
In my view, the evidence in this case is equivocal at best. Dr. Thompson, Newell’s treating physician, concluded in his letter that Newell’s total disability
could be due to
pneumoconiosis. This case therefore differs significantly from both
Shelton
and
Hawkins
in which there existed affirmative, unequivocal evidence supporting a
finding of causation. The record in
Shelton
included a report from a doctor who concluded that the miner’s totally disabling respiratory disease was “related to” coal dust exposure.
Shelton,
899 F.2d at 691. In
Hawkins,
the record contained a medical report from a physician who concluded that the miner’s pulmonary disease was “attributable to” coal mine work.
Hawkins,
907 F.2d at 706-07.
In addition to its equivocal nature, Dr. Thompson’s comment was the sole evidence in the record addressing causation. Thus the only evidence linking Newell’s total disability to pneumoconiosis was Dr. Thompson’s statement that Newell’s “restrictive lung disease ...
could be
from the pneu-moconiosis.” As the ALJ noted, Dr. Campbell, who examined Newell at the employer’s request, concluded that cigarette smoking was the cause of Newell’s breathing disorder, while Dr. Fozard, who examined Newell at the Department of Labor’s request, found that Newell’s condition was caused by cigarette smoking and obesity, not pneumoconiosis. Despite these weaknesses in Newell’s evidence, a majority of the panel concludes that a remand to the AU would be the more prudent course. In my opinion, the paltry evidence in this case clearly demonstrates the futility of a remand and I would hold that the inappropriate application of the
Wilburn
“in and of itself” standard was harmless error. My colleagues, however, are not convinced, and we therefore remand the case to allow the AU to apply the appropriate causation standard to this case.
For the foregoing reasons, the decision of the Benefits Review Board affirming the AU’s denial of benefits is Reversed, and the case is Remanded to the AU for further proceedings consistent with this opinion.
RIPPLE, Circuit Judge.
I concur in the result.