Code of Federal Regulations Title 20. Employees' Benefits § 20.718.304 Irrebuttable presumption of total disability or death due to pneumoconiosis

(a) When diagnosed by chest X–ray (see § 718.202 concerning the standards for X–rays and the effect of interpretations of X–rays by physicians) yields one or more large opacities (greater than one centimeter in diameter) and would be classified in Category A, B, or C in accordance with the classification system established in Guidelines for the Use of the ILO International Classification of Radiographs of Pneumoconioses as provided in § 718.102(d);  or

(b) When diagnosed by biopsy or autopsy, yields massive lesions in the lung;  or

(c) When diagnosed by means other than those specified in paragraphs (a) and (b) of this section, would be a condition which could reasonably be expected to yield the results described in paragraph (a) or (b) of this section had diagnosis been made as therein described:  Provided, however, that any diagnosis made under this paragraph must accord with acceptable medical procedures.