MPM_Admin One of the easiest changes is to code positive pregnancy test visits as [Z34.90] Encounter for Supervision of Pregnancy, Unspecified, instead of [Z32.01] Encounter for pregnancy test, result positive or [Z33.1] Pregnant state, incidental, which do not count for HEDIS. The documentation required to use [Z34.90] is minimal and probably less than what a prudent clinician would do anyway.