Can I have 2 medical insurances (one being PPO, other being HDHP with HSA)?

I currently have a PPO insurance with United Healthcare through my university. Since I am interning at a company, they are offering me a HDHP insurance (with 0 premium) with a HSA account where the company would be contributing to the HSA account. I want to know whether I can get the HDHP (with HSA account) plan from my company or is it not allowed if we already have a PPO insurance.

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I googled, came across articles saying a person can't have one non-HDHP and one HDHP insurance together. I also called the Unitedhealthcare customer service, they said you can have the second insurance, the only thing is that you need to tell us (UnitedHealthcare) about the second insurance's details so that the 2 insurance companies can decide who is primary and secondary by themselves.

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PS: I am a international student here in the USA so not sure how that affects this situation. I planning for the second insurance as I don't want to miss out on the HSA contributions from my company.

Thank You!

submitted by /u/Da_Mann_ist_Great
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