Hi D.,
Oh I wish it were so... I too wanted to return part time. The short answer is NO. They do not have to give you part time. They can, as my employer did, insist that you return to work full time with NO flexibility whatsoever, or nothing. (And then when I did that, I literally had no work to do, and even now I often sit at my desk idol, surfing the web 3 months into my return.) In my case the decision was left to my manager (oddly enough, I work in the HR department) whether I was allowed a flexible work arrangement to return to. So that is worst case.
The longer answer is that FMLA and insurance are seperate things except in that FMLA requires the employer to mantain insurance coverage during leave for you, with you still responsible for your normal contribution, until you return. BUT then company policy can kick in, and if you do not return, or you return in a different capacity (part time with no benefits, lower benefits, or increased premiums) they can force you to pay them back the money for your benefits during leave. This is company policy, not insurance policy - no matter what they tell you. You will need to ask about this for your company.
Here is the pertinent paragraph from the FMLA:
JOB RESTORATION
Upon return from FMLA leave, an employee must be restored to the employee’s original job, or to an equivalent job with equivalent pay, benefits, and other terms and conditions of employment. An employee’s use of FMLA leave cannot result in the loss of any employment benefit that the employee earned or was entitled to before using FMLA leave, nor be counted against the employee under a “no fault” attendance policy. If a bonus or other payment, however, is based on the achievement of a specified goal such as hours worked, products sold, or perfect attendance, and the employee has not met the goal due to FMLA leave, payment may be denied unless it is paid to an employee on equivalent leave status for a reason that does not qualify as FMLA leave.
An employee has no greater right to restoration or to other benefits and conditions of employment than if the employee had been continuously employed.
This is the only FMLA you should read: http://www.dol.gov/esa/whd/fmla/
The above comes from that website "Fact Sheet 28".
Here is my advice: Assess the previous flexibility of your employer - have they made flexible return to work arrangments for others in a similar capacity to yours? Ask what the policies are if you did decide you wanted to return with a flexible schedule - who is the decision maker? I would not tell them you have a specific plan - I would only ask "just in case" and as though you don't know for sure what you are going to do. No conversation with HR is ever off the record, so I would be very careful if you aren't sure that they will support this (because you may end up with a whopping insurance premium bill if you don't return on their terms). In my case, I could quit and not suffer any financial penalty, so that is also possible. Just gather information, and take your leave. Then, what I recommend, and what I did was a month before I returned, I called a meeting with my manger (and brought the baby in for a visit) and explained to my manager that I would like to return and part time. She said she would think about it. During that meeting, I outlined my date of return, and any expecttions I had, and asked about any changes in my absence. This way, everyone is ready, and it gives them some time to make arrangements for you (a room to pump or someone to job share with, whatever that might be). It was at that time that I actually asked about any insurance implications I might have if I decided not to return.
I wish you the best of luck. In my case, I tried for a month - kept asking higher levels of people, kept going at it from different angles (my husband was on paternal leave during this time) and just kept asking... finally, I decided to resign, and the last day of my 2 week notice they told me I could work from home 2 days a week. This was my minimum to stay with my employer, so I took it to try it out. Working from home is ablessing if you can do it, especially when the baby is still young and you are breastfeeding. (that may be another option for you) I am still continuing to try to go part time. They still won't allow that, but I am hopeful that I can get it worked out in a few months time. Meanwhile I am taking it day by day. I am in a unique situation where I could not work at this employer again if I left, in all likliood, and my employer is a very unique place. I don't want to lose my job overall because of that, so I am trying to make it work and hoping I either geta new manager sometime soon, or find another opportunity within the organization that allows me part time work.
GOOD LUCK!!!