Good news! No tricky rules to memorize!
HSAs aren’t subject to coordination of benefit rules, since they’re not considered an insured Plan.
So, if you do happen to have a traditional benefits Plan plus your HSA, you can definitely submit claims through that Plan first, then any remaining balance through your HSA to get the most bang for your buck!
Alternatively, you can completely bypass your other Plan and submit claims directly through your HSA.
A great benefit of an HSA is the flexibility to use your funds towards eligible expenses however works best for you!