If I was served a notice a motion for partial summary judgement, how should I proceed?

Question Details: I was served this notice regarding a debt assigned to a collection agency from their attorney. The amount being sued for is $644 for a unpaid medical bill. This notice also contains a hearing date for the 23rd. I was wondering how I should defend myself at this hearing. The motion contained a affidavid from the original creditor stating the amount being owed. However no actual breakdown of charges owed just $644. Could I use that as a defense perhaps? What about HIPPA laws as the collection agency is limited to what they have access too.

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