Voicemail sounded like a scam, but it turned out to be an Aetna robo call to remind you about children's vaccinations.  

That number left a message saying they were from AETNA, an insurance carrier.

left a voice message and a number to call back. Just remind to for the children's vaccines.

Got a call from this number, asking for the parent/guardian of a patient, and that if I wasn't them, to take a message. It called my personal cell that is not on anyone's emergency contact list. Also gave another number to have the guardians call. Can't tell if the patient was a real patient or not.

Repeated calls from this number - the message claims to be from a healthcare provider (which it's not). It also was able to repeat non-public information from the provider (e.g. the name of dependents on the plan). Data breach???