I have it and I'd like to do some checkup... used to visit UMMC pediatrics for this, but then cause overseas so never follow up anymore. Should I go back to UMMC (same department?)

Anyone with the VSD (ventricular septal defect) condition here can advise?

Public hospital / private clinic also OK.

Round up whatever documentation, referral letter, medical reports you have. In theory, any klinik with a doctor with a stethoscope who's adept at listening heart sounds can start to know whether your VSD is noticeable.

But since an echocardiogram is the standard in imaging and assessment, you'll need that done by anyplace that has a cardiology facility. I'm going to assume your VSD is asymptomatic growing up now, so the most convenient would be to go for a private hospital to avail a cardio consult for an echo. Public hospital would put you as a low priority if asymptomatic ever since.