HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / CA

AILEEN GRACE GUILLEN, MD

EMERGENCY MEDICINE

Graduated: 2023

NPI: 1427753946

Practice Locations (2)

12727 BRIAN CT

CERRITOS, CA 907031117

335 E AVE I

Lancaster, CA 935351916

Source: CMS National Downloadable File, September 2026.