Andrew J. Day, MD
Accepting New Patients

Andrew J. Day, MD

  • Endocrinology
Average rating: 5.0
 
Santa Clarita Primary & Specialty Care |

About

Dr. Andrew Day is an endocrinologist who practices at UCLA Health's Santa Clarita clinic.

Dr. Day received his medical degree from the Temple University School of Medicine. He completed his internship and residency in internal medicine at the University of Wisconsin, Madison. He moved to the University of California, Los Angeles to complete a fellowship in endocrinology, diabetes, and metabolism. He received his undergraduate degree from the University of Chicago, where he graduated with honors.

Prior to pursuing a career in medicine, Dr. Day participated in research that studied the associations between sleep and metabolic health. Dr. Day has an interest in medical education and is involved with the David Geffen School of Medicine at UCLA.

Dr. Day was born and raised in Wisconsin. Outside of medicine, his interests include travel, reading, baseball, camping, hiking, kayaking, and enjoying the arts.

Patient Stories

Great UCLA Doctor

Languages

English

Education

Medical Board Certifications

Endocrinology, Diabetes and Metabolism, American Board of Internal Medicine, 2018
Internal Medicine, American Board of Internal Medicine, 2016

Fellowship

Endocrinology Diabetes & Metabolism, UCLA School of Medicine, 2018

Residency

Internal Medicine, University of Wisconsin Hospitals and Clinics, 2016

Degree

MD, Temple University School of Medicine, 2013

Recognitions

  • Super Doctors® Southern California Rising Stars 2021-2025

Hospital Affiliations

Ronald Reagan UCLA Medical Center

Medical Services

Research

Publications

  1. Day A, Yeh M, Livhits M. Surgery for Hyperthyroidism Lowers Cardiovascular Mortality Compared with Radioactive Iodine. Clinical Thyroidology. Jan 2018; 30: 15-17.
  2. Grock S, Day A, Bhat S. Two cases of impaired sensitivity to thyroid hormone with wild-type THRβ gene. Clinical Thyroidology. Aug 2017; 29: 318-321.
  3. Broussard J, Kilkus J, Delebecque F, Abraham V, Day A, Whitmore H, Tasali E. Elevated ghrelin predicts food intake during experimental sleep restriction. Obesity. Jan 2016; 24(1):132-8.
  4. Broussard J, Chapotot F, Abraham V, Day A, Delebecque F, Whitmore H, Tasali E. Sleep restriction increases free fatty acids in healthy men. Diabetologia. Apr 2015; 58(4):791-8.
  5. Pamidi S, Wroblewski K, Broussard J, Day A, Hanlon E, Abraham V, Tasali E. Obstructive sleep apnea in young lean men: impact on insulin sensitivity and secretion. Diabetes Care. Nov 2012; 35(11):2384-9.

Insurance

  • Aetna
  • Anthem Blue Cross
  • Blue Shield of California
  • Centivo
  • Cigna
  • First Health
  • Health Net of California
  • Interplan (part of HealthSmart)
  • Medicare Advantage
  • MultiPlan
  • UFCM Health System
  • Prime Health Services
  • Private Healthcare Systems (PHCS)
  • TRICARE
  • UnitedHealthcare

The list of health care plans above may not be comprehensive and could change. 
Please contact your benefits coordinator or health insurance company directly to verify coverage.

Visit our health insurance information page for more details.

Recognitions

  • Super Doctors® Southern California Rising Stars 2021-2025

Reviews

Overall Rating:
5.0
326 total ratings | 108 reviews
5.0
July 31, 2025
Dr. Day explains test results throughly. He also has a wonderful reassuring manner.
5.0
July 30, 2025
Great Dr
5.0
July 30, 2025
Dr Day is very supportive and informative, always very positive and encouraging Very much appreciated, I am certainly grateful for having him as my endocrinologist Thank you Dr Day
5.0
July 30, 2025
Dr. Day is very caring and attentive. He addressed my lab values and explained everything in clear terms. He offered helpful suggestions in a very positive manner.
5.0
July 29, 2025
He is always great responding questions and taking his time to listen to my concerns