38 U.S.C. § 7422 : US Code - Section 7422: Collective bargaining

      (a) Except as otherwise specifically provided in this title, the
    authority of the Secretary to prescribe regulations under section
    7421 of this title is subject to the right of Federal employees to
    engage in collective bargaining with respect to conditions of
    employment through representatives chosen by them in accordance
    with chapter 71 of title 5 (relating to labor-management
    relations).
      (b) Such collective bargaining (and any grievance procedures
    provided under a collective bargaining agreement) in the case of
    employees described in section 7421(b) of this title may not cover,
    or have any applicability to, any matter or question concerning or
    arising out of (1) professional conduct or competence, (2) peer
    review, or (3) the establishment, determination, or adjustment of
    employee compensation under this title.
      (c) For purposes of this section, the term "professional conduct
    or competence" means any of the following:
        (1) Direct patient care.
        (2) Clinical competence.

      (d) An issue of whether a matter or question concerns or arises
    out of (1) professional conduct or competence, (2) peer review, or
    (3) the establishment, determination, or adjustment of employee
    compensation under this title shall be decided by the Secretary and
    is not itself subject to collective bargaining and may not be
    reviewed by any other agency.
      (e) A petition for judicial review or petition for enforcement
    under section 7123 of title 5 in any case involving employees
    described in section 7421(b) of this title or arising out of the
    applicability of chapter 71 of title 5 to employees in those
    positions, shall be taken only in the United States Court of
    Appeals for the District of Columbia Circuit.