Catherine Michels Alonzo, M.D.
Urology Physician · Greenwich, CT
Catherine Michels Alonzo, M.D. is a urology physician with a practice address in Greenwich, Connecticut, and NPI 1770802357, issued on May 22, 2010. Check the license (Connecticut 49084, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Catherine Michels Alonzo
- Credential
- M.D.
- Primary taxonomy
- Urology Physician 208800000X
- License numbers
- 49084 CT
241260 NY
Self-reported in NPPES; status is on the state search - Practice location
- 49 Lake Ave, Greenwich, CT 06830
- Phone
- (203) 869-1285
- Enumerated
- May 22, 2010
- Record last updated
- Sep 12, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (203) 737-8035
- Entity
- Type 1 · individual
8 nearest urology physician records → All 185 in Connecticut → Look up another NPI →
Also registered at 49 Lake Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- James Borges, MDSpecialist1073506705
- Steven Bramwit, MDOtolaryngology Physician1730183146
- Richard Brauer, M.D.Otolaryngology Physician1841335163
- Richard Danehower, MDSpecialist1750496683
Verify Catherine Michels Alonzo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 49084Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Catherine Michels Alonzo among 185 urology physician records in Connecticut
Catherine Michels Alonzo, M.D. is one of 185 urology physician records with a practice address in Connecticut. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 65% of them.
- NPI issued2010 · 65% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2019 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in Connecticut
There are 185 urology physician records in Connecticut.
All 185 in Connecticut → Every provider in Greenwich → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Christopher Bednarz, MDGreenwich, CT 068301467010595
- Nicholas Stroumbakis, M.D.Greenwich, CT 068301871597641
- Brittany Berk, MDFairfield, CT 068241467912816
- Steven Kardos, M.D.Fairfield, CT 068241356668669
- Kenneth Kingsly, MDFairfield, CT 068241932112547
- Lawrence Muldoon, M.D.Fairfield, CT 068241598861528
- Matthew Wosnitzer, M.D.Fairfield, CT 068241619134269
- Edward Beck, MDDanbury, CT 068101245235449
Common questions
What is Catherine Michels Alonzo, M.D.'s NPI number?
Catherine Michels Alonzo, M.D.'s National Provider Identifier (NPI) is 1770802357, issued on May 22, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Michels Alonzo, M.D. located?
The NPPES record lists a practice address at 49 Lake Ave, Greenwich, CT, 06830. Phone: (203) 869-1285. Providers update this record themselves, so call before visiting.
How can I verify Catherine Michels Alonzo, M.D.'s license?
NPPES lists Connecticut license number 49084, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Catherine Michels Alonzo, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.