The dress code is business casual Monday-Thursday and jeans on Friday, and the code specifically enumerates what jeans wear is acceptable for Friday. Basically, one needs to demonstrate professionalism in their appearance and dress regardless of what day of the week, but unfortunately, the dress code is subjective to many, so you will occasionally find dress code offenders on any given day. In my experience, it isn't surprising to find a dress code offender in any workplace.
As for the type of people at the company, I believe the atmosphere in which you work is dependent on the personality of your coworkers. Fortunately, I work in a department of people who enjoy the occasional happy hour; "work hard, play hard" are words by which we live.
Amerigroup is one of the best-managed companies, and there are many sharp, innovative, and hard-working individuals here. Needless to say, this is a fast-paced, busy, and challenging workplace with the aim of providing quality healthcare to its members while helping states spend tax dollars wisely. Bottom line...the purpose that this company serves is a good one. It's a company worth considering applying for.