Yes. On a group plan, an exclusion can never apply to pregnancy, regardless of whether the woman had previous coverage (or the size of the group plan). In addition a pre-existing condition exclusion cannot apply to a newborn or child placed in the home for adoption under age 18 as long as the child became covered within 30 days of birth or placement for adoption, and provided the child does not incur a subsequent 63 day or longer break in coverage (Note: states may vary with the number of days a break in coverage is permitted before the exclusion applies).
Important: With regard to Individual Coverage, pregnancy can be considered a pre-existing condition if the member had a lapse in Individual, not Group, coverage of more than 31 days.