Cliff M. O'Callahan, MD, PhD

Chair, Department of Pediatrics
Middlesex Health Family Medicine - Middletown
Primary Specialty: Pediatrics
  • Accepting New Patients
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Cliff M. O'Callahan, MD, PhD

About Me

Specialties/Areas of Care


Inpatient Pediatric Infant Care

LGBTQ+ Health

Primary Care

Family Medicine

Special Training

Breastfeeding Support

LGBTQ+ Health

Languages Spoken



Cliff M. O'Callahan, MD, PhD is a pediatrician at Middlesex Health Family Medicine. He also serves as the Director of Nurseries and Chair of the Department of Pediatrics at Middlesex Health.

Training & Expertise

Dr. O'Callahan is certified by the American Board of Pediatrics. He completed his residency at the University of Washington Affiliated Hospitals/Children's Hospital Medical Center, after earning his medical degree at the University of Health Sciences/Chicago Medical School. Dr. O'Callahan also holds a PhD in biochemistry from the University of Health Sciences/Chicago Medical School.

Dr. O'Callahan offers complete primary care for children from infancy through adolescence. He partners with each patient and their guardian(s) to provide exceptional clinical care while also supporting the well-being of the entire family.

More About Dr. O'Callahan

In addition to his clinical practice, Dr. O'Callahan serves as the leader of the Global & Community Health Track at the Middlesex Health Family Medicine Residency Program. He has provided pediatric care all over the world, including in Guatemala and Rwanda.

Dr. O'Callahan is an associate professor at the Frank H. Netter School of Medicine at Quinnipiac University at the University of Connecticut School of Medicine.

Outside of his practice, Dr. O'Callahan enjoys hiking, sailing, mountain biking, reading and traveling.

Special Interests

Behavior Issues
Early Childhood Development
Injury Prevention
LGBTQ+ Health


Education & Training

Internship/Residency University of Washington/Children's Hospital Medical Center, Seattle, WA
Medical School University of Health Sciences/Chicago Medical School, North Chicago, IL
Doctoral Program University of Health Sciences/Chicago Medical School, North Chicago, IL

Board Certification

American Board of Pediatrics - Pediatrics

Locations & Appointments

1 Office Location

1Middlesex Health Family Medicine - Middletown

90 South Main Street
Middletown, CT 06457
Office Hours
7:30 AM - 5:00 PM
9:00 AM - 7:30 PM
9:00 AM - 5:00 PM
9:00 AM - 7:30 PM
9:00 AM - 5:00 PM
9:00 AM - 12:00 PM
Middlesex Health Family Medicine - Middletown

Insurance Accepted

Middlesex Health treats patients in their emergency departments regardless of their ability to pay.

  • Multiplan
  • ConnectiCare
  • Centivo
  • Harvard Pilgrim Health Care
  • United Healthcare
  • United Healthcare (including Golden Rule, UMR, United Behavioral Health, United Integrated Resources)
  • Aetna
  • Oxford Healthplans
  • Medicare
  • Connecticut State Medicaid (Husky) A, B, C, D, Charter Oak
  • Northeast Health Direct
  • Healthcare Value Management
  • CarePartners of Connecticut
  • Champus/Tricare
  • Value Options (Behavioral Health services only)
  • MHN (Behavioral Health services only)
  • Blue Cross & Blue Shield
  • Private Health Systems (PHCS)
  • Cigna
  • Cigna (including Starbridge and Great West)
  • HMC

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