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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
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Title 42
Chapter I
Part 81
Subpart E - Subpart E—Guidelines To Estimate Probability of Causation
§ 81.20 - Required use of NIOSH-IREP.
§ 81.21 - Cancers requiring the use of NIOSH-IREP.
§ 81.22 - General guidelines for use of NIOSH-IREP.
§ 81.23 - Guidelines for cancers for which primary site is unknown.
§ 81.24 - Guidelines for leukemia.
§ 81.25 - Guidelines for claims including two or more primary cancers.
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