Dr. Abaya is board certified in internal medicine and nephrology. Graduating as Medical Class Valedictorian at the University of the Philippines in 1984, Dr. Abaya began his medical career as an intern and resident at Cook County Hospital in Chicago, Illinois. He was honored for his outstanding clinical performance at Cook County Hospital from 1988 to 1989.
In 1989, he came to Houston, Texas as a fellow in the Baylor College of Medicine Nephrology Program. He received an award as president of the Texas Association of Philippine Physicians in 1998. To better accommodate his patients, Dr. Abaya founded his private practice on Dorrington Street in 2006. Dr. Abaya continues to serve his patients at various hospitals and dialysis centers around Houston, but most specifically at Houston Methodist Hospital and at his private practice clinic.