It would appear so....
http://www.dol.gov/ebsa/faqs/faq_consumer_hipaa.html
and
http://www.cms.hhs.gov/CreditableCov....asp#TopOfPage
Although may not be eligible for medicare, many US rules are made that apply to medicare, and then insurers generally follow suit.
But, you probably want evidence of your health coverage in Switzerland, probably an official document from your insurer (e.g., written on letterhead), and of course in English. Evidence of payment for your health insurance might be a good thing to have as well. And, you might have to push a bit if you get push back from people at your US insurer who are reluctant to look at foreign forms - in fact, I'd follow what the insurer is doing pretty closely.