Section 23: amended, on 22 January 1996, by section 3(3) of the Health and Disability Services Amendment Act 1995 (1995 No 84).
Section 23(a): amended, on 26 July 1988, pursuant to section 2(4) of the Health Amendment Act 1988 (1988 No 99).
Section 23(d): amended, on 23 March 1987, by section 7(2) of the Health Amendment Act 1987 (1987 No 10).
Section 23(e): amended, on 22 January 1996, by section 3(3) of the Health and Disability Services Amendment Act 1995 (1995 No 84).
Section 23(f): replaced, on 22 January 1996, by section 3(3) of the Health and Disability Services Amendment Act 1995 (1995 No 84).
Section 23(f): amended, on 15 November 2021, by section 206(1) of the Water Services Act 2021 (2021 No 36).