Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Catherine Michels Alonzo, MD

Individual provider Urology Physician · NPI 1770802357

Catherine Michels Alonzo, MD is an Urology Physician in Greenwich, Connecticut. Licensed in Connecticut and New York. Registered with an NPI since 2010.

Licensed in
CT, NY
In the registry since
2010
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

49 Lake Ave Ste 201
Greenwich, CT 06830-4501
Phone: (203) 869-1285
Fax: (203) 737-8035
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Urology Physician (primary) Taxonomy 208800000X · Licence 49084 (CT)
Urology Physician Taxonomy 208800000X · Licence 241260 (NY)

Record details

NPI number1770802357
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 22, 2010
Last updated in NPPESSeptember 12, 2019

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