One of the greatest challenges in black lung claims is establishing that a miner’s lung problems are attributable to coal mining, particularly where the miner doesn’t qualify for the presumption of causation. To establish medical causation for a federal Black Lung benefits claim, a claimant must prove that their disabling respiratory impairment arose out of, or was substantially contributed to by, coal mine employment. To avoid liability, most coal mining companies will argue that the miner does not suffer a disability or that the miner’s respiratory illnesses resulted from other exposures rather than coal mine dust. These companies often bring in experts who try to dispute the miner’s illness, disability, and its relation to coal mining.
Elements of proof
Unless a coal miner meets the requirements of the Black Lung Act causation presumption, the miner must prove four elements in his or her claim by a preponderance of the evidence:
- The miner suffers from pneumoconiosis
- The pneumoconiosis arose out of coal mine employment
- The miner suffers from a totally disabling respiratory impairment
- His or her total disability is due to pneumoconiosis.
In cases involving a survivor claim, the claimant must provide evidence to show that:
- The miner suffered from pneumoconiosis
- The pneumoconiosis arose out of coal mine employment
- Coal workers’ pneumoconiosis caused, or contributed to, the miner’s death
Interpretation of medical evidence
Miners and their survivors are only awarded benefits under the Black Lung Benefits Act if it is demonstrated through a preponderance of the medical evidence, or by operation of a presumption, that pneumoconiosis arose from coal dust exposure. An Administrative Law Judge (ALJ) may draw reasonable inferences from the evidence a claimant presents. However, when a case involves highly complex, rare, or contradictory medical evidence, the ALJ often involves a medical expert. The independent medical expert serves as an impartial educator for the court, providing an understanding of the medical evidence submitted in black lung claims, including explanations of chest x-rays, the use of the ILO form, pulmonary function (ventilatory) studies, and blood gas studies. ALJ is not empowered to substitute its judgment for that of the medical expert.
Chest x-ray study
A chest x-ray may indicate the presence or absence of pneumoconiosis and its etiology/causation. Category 1 is the minimum interpretation that qualifies as positive for pneumoconiosis. An interpretation of Category 1 means that the physician has diagnosed simple clinical pneumoconiosis. The term “pneumoconiosis” means “a chronic dust disease of the lungs.” If the X-ray evidence demonstrates the presence of clinical pneumoconiosis (Category 1, 2, or 3, and/or A, B, or C), then the ALJ must determine the cause of the opacities observed and whether it relates to coal dust exposure as a coal miner.
Chest x-ray evidence is used only to determine whether the miner is totally disabled, where complicated pneumoconiosis is indicated. Complicated pneumoconiosis is the most advanced form of pneumoconiosis. For complicated pneumoconiosis, the miner has one or more opacities in his or her lungs. An A, B, or C designation involves a mass that is greater than one centimeter in diameter.
If a chest x-ray is positive for either simple or complicated clinical pneumoconiosis, the report should indicate the size, type, and quantity of opacities in the lungs. Larger and/or more opacities indicate that the disease is progressing. An X-ray interpretation can be in narrative form (as in treatment records) or embedded in a medical report. An X-ray interpretation does not necessarily have to be on the official ILO form. It must, however, comply with the quality standards, the physician must be qualified, and the interpreting physician must specify Category 1, 2, or 3 simple pneumoconiosis, or size A, B, or C complicated pneumoconiosis.
The pulmonary function (ventilatory) study
The pulmonary function study, also referred to as a ventilatory study or spirometry. It measures the presence of obstruction and/or restriction in the lungs. Evidence of deteriorating lung function can be deduced from increased airflow resistance or increased scarring of lung tissue. A pulmonary function study does not establish the presence of pneumoconiosis; rather, it is used to measure the degree of the miner’s disability. In some cases, medical experts may cite pulmonary function test results to support their views on whether the miner’s lung disease is due to coal dust exposure. The ALJ may resolve such conflicting medical opinions through a medical expert.
During a pulmonary function study, the miner is required to blow hard into a mouthpiece connected to a flowmeter. A spirometer records the amount of air expired through the flowmeter over time on a tracing. The ventilatory study is conducted three times to assess whether the miner exerted optimal effort among trials. The FEV1 values, as well as MVV or FVC, must be recorded, and the highest values from each category across trials are used to determine the level of the miner’s disability. If the miner has a pulmonary or respiratory impairment, undergoing this test may be very difficult, and the miner may be unable to complete it due to coughing or shortness of breath.
A bronchodilator may be administered before conducting a pulmonary function study to clear the miner’s airways. If the results are higher or non-disabling with the use of a bronchodilator, this will often indicate the presence of asthma or another reversible condition, as opposed to pneumoconiosis.
The blood gas studies
A blood gas study measures the lungs’ ability to oxygenate blood. The initial indication of a miner’s impairment may manifest as alveolar clogging rather than airway obstruction, thereby making the blood gas study a valuable tool in assessing disability. A lower oxygen level relative to carbon dioxide in the blood indicates a deficiency in gas transfer across the alveoli, which will leave the miner disabled.
When performing the study, a blood sample is taken from the miner at rest and after exercise. However, the requirement to exercise may be difficult, and the miner may not complete the test due to shortness of breath and coughing. A blood sample taken during exercise helps in the diagnosis because exercise requires the body to oxygenate blood more quickly. The blood sample is analyzed for the percentages of oxygen (PO2) and carbon dioxide (PCO2).
Pulmonary function studies and blood gas studies measure different types of impairment. Therefore, one set of studies may yield qualifying results and demonstrate a totally disabling respiratory impairment, whereas another set of studies may not be qualifying. A miner may be found totally disabled based on blood gas testing, notwithstanding negative X-ray evidence and non-qualifying pulmonary function testing. For example, an impairment in the transfer of oxygen from the alveolar air spaces to the cellular level can exist in an individual even though his chest X-ray or ventilatory function tests are normal.
Pulmonary function studies measure a distinct aspect of pulmonary function from blood gas studies. Pulmonary function studies only measure the lungs’ ability to take in and expire air. A blood gas study is a more detailed test that measures gas exchange between the alveoli and the blood, reflecting the lungs’ ability to extract oxygen from the air and deliver it to the bloodstream in a usable form. Results from these two tests may consistently not correlate since coal workers’ pneumoconiosis may manifest itself in different types of impairment.
A Well-Reasoned Physician’s Opinion
A claimant must also provide a well-reasoned, documented medical opinion from a qualified physician detailing the physician’s conclusions regarding the miner’s illness. The physician must explicitly state how and why coal mine dust exposure caused or aggravated the impairment, drawing direct lines between the miner’s specific work environment and their current medical metrics.
The DOL defines a “reasoned” opinion as one where the doctor’s conclusions are logically supported by the facts. The report cannot simply state a diagnosis; it must explain the mechanisms. The physician must explicitly acknowledge the miner’s total years of coal mine employment, their specific job duties, and other facts such as the exact history of tobacco use (in pack-years). The doctor must explain how the objective medical tests (Spirometry/PFS, Arterial Blood Gases, and X-rays) directly point to an occupational lung disease. If the miner has legal pneumoconiosis (such as severe COPD or emphysema), the physician must provide a detailed medical rationale explaining how coal mine dust substantially contributed to or aggravated the disease, rather than citing general medical concepts.
To establish that a miner is totally disabled, the physician’s report must identify the heavy physical demands of the miner’s usual coal mine employment, evaluate the miner’s current physiological limitations based on pulmonary testing, and opine whether the respiratory impairment prevents the miner from performing those specific tasks.
One of the fiercest conflicts in a black lung claim medical opinions is “dual causation,” where a miner has a history of both coal mine work and tobacco smoking. Coal mine operators frequently attempt to blame a miner’s COPD or emphysema entirely on smoking. To win a claim in this scenario, the medical evidence does not need to show that coal dust was the only cause of the respiratory disability. Instead, the physician’s report must conclusively show that coal dust exposure was a “substantially contributing cause” or that it “significantly aggravated” the respiratory illness alongside the smoking.
A claimant’s medical opinion from a qualified physician is the most heavily scrutinized piece of evidence. Coal operators employ aggressive legal teams that specifically scan claimant medical reports for weaknesses. Also, the Administrative Law Judges (ALJs) frequently look past medical reports to focus on how a physician explains the relationship between the miner’s history and their disease.
Conclusion
Coal miners face several challenges in pursuing federal black lung claims, especially in developing sound medical evidence to support them. These challenges are attributed to the miners’ lack of resources, the low probability of success, and the high litigation costs for their cases. For the same reasons, miners also have difficulty finding legal representatives. According to reports by DOL administrative law judges, medical evidence prepared by DOL-approved doctors for claimants does not always provide sound or thorough evidentiary support for their claims. The representation of a qualified attorney improves the chances of winning a black lung claim. Hugh Stephens represents eligible black lung claimants who intend to file black lung claims. Contact black lung attorney Mr. Stephens on his cell phone at (716) 208- 3525 for help filing a black lung claim. He will help you gather the necessary evidence to prove your claim.