20 C.F.R. § 220.63
All implications of possible conflict of interest between Board medical consultants and their medical practices will be avoided. Board review physicians or psychologists will not perform consultative examinations for the Board's disability programs without prior approval. In addition, they will not acquire or maintain, directly or indirectly, including any member of their families, any financial interest in a medical partnership or similar relationship in which consultative examinations are provided. Sometimes one of the Board's review physicians or psychologists will have prior knowledge of a case (e.g., the claimant was a patient). Where this is so, the physician or psychologist will not participate in the review or determination of the case. This does not preclude the physician or psychologist from submitting medical evidence based on prior treatment or examination of the claimant.
20 C.F.R. § 220.63