Summary

Dr. Catherine Alonzo is a board-certified urologist who specializes in comprehensive urological care. She earned her medical degree from Drexel University College of Medicine and completed her residency at New York Medical College. With 23 years of experience in urology, Dr. Alonzo has developed expertise in treating a wide range of urological conditions affecting both men and women. She provides care in both English and Spanish, helping her connect with diverse patient populations throughout the Greenwich community.

Dr. Alonzo practices at Greenwich Hospital and Greenwich Urological Associates in Greenwich, Connecticut. She treats patients experiencing acute urinary retention and other urinary complications, providing both diagnostic and therapeutic solutions. Her practice includes performing abdominal imaging studies to help diagnose urological conditions. Patients have rated Dr. Alonzo 4.3 out of 5 stars, reflecting their confidence in her clinical expertise and patient care approach.
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Overview based on verified provider data

Quick Facts

  • 4.3
  • 23 years of experience
  • speaks English, Spanish
  • New York Medical College
  • 3 written reviews
  • 1 specialty
  • 10 areas of expertise
  • 1 board certification
  • 1 hospital affiliation
  • 2 office locations
  • Female

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Catherine Michels Alonzo has 2 locations

Greenwich Urological Associates Pc

49 Lake AveGreenwich, CT 06830
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

Greenwich Hospital

5 Perryridge RdGreenwich, CT 06830

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Dr. Catherine Michels Alonzo, MD
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Dr. Catherine Michels Alonzo, MDDr. David A. Green, MDDr. Neal Arvind Patel, MDDr. David Martin Weiner, MD
UrologyUrologyUrologyUrology
Accepts New Patients
4.3 
4.7 
23 Years of Experience 21 Years of Experience 12 Years of Experience 32 Years of Experience
No Virtual Visit Option Virtual Visit Available No Virtual Visit Option Virtual Visit Available
Speaks English, Spanish Speaks English Speaks English
Greenwich , CTFresh Meadows , NYFresh Meadows , NYNew York , NY
Med School: Drexel University College Of Medicine Med School: Mount Sinai School of Medicine Med School: George Washington University School Of Medicine & Health Sciences Med School: Rutgers New Jersey Medical School
Current Profile
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Insurance Plans Accepted by Dr. Catherine Michels Alonzo

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. Catherine Michels Alonzo has the following specialty

Specialty Expertise

Dr. Catherine Michels Alonzo has the following 10 areas of expertise

  • Bladder Issues
  • Erectile Dysfunction (ED)
  • Kidney Stones
  • Lithotripsy
  • Overactive Urinary Bladder
  • Prostate Cancer
  • Prostatitis
  • Urinary Bladder Cancer
  • Urinary Incontinence
  • Urologic Emergencies

Certifications, License, & Education

23 Years Experience

Dr. Catherine Michels Alonzo holds an expired medical license in the state of Connecticut.

Medical License

Medical Doctor with an expired medical license in the state of Connecticut that expired in 2026.

Education & Training

Residency

Completed their residency at New York Medical College.

Medical School

Graduated from Drexel University College Of Medicine in 2003.

NPI Number

Dr. Alonzo's NPI number is 1770802357.

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Frequently Asked Questions

Where is Dr. Catherine Alonzo's office located?
Dr. Catherine Alonzo's office is located at 49 Lake Ave, Greenwich, CT, 06830.
Does Dr. Catherine Alonzo accept virtual/telehealth appointments?
Dr. Catherine Alonzo has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Which hospitals is Dr. Catherine Alonzo affiliated with?
Dr. Catherine Alonzo is affiliated with Greenwich Hospital.
Does Dr. Catherine Alonzo accept my insurance?
You can see the insurance plans that Dr. Catherine Alonzo accepts on their Vitals profile.
How can I make an appointment with Dr. Catherine Alonzo?
You can find contact information for Dr. Catherine Alonzo here on Vitals.

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