Ken Matsuo, MD
Internal Medicine Physician · Waterbury, CT
Ken Matsuo, MD is an internal medicine physician with a practice address in Waterbury, Connecticut, and NPI 1053600429, issued on Apr 6, 2011. Check the license (Connecticut 53316, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ken Matsuo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 53316 CT
Self-reported in NPPES; status is on the state search - Practice location
- 56 Franklin St, Waterbury, CT 06706
- Phone
- (203) 709-8820
- Enumerated
- Apr 6, 2011
- Record last updated
- Aug 18, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (203) 709-3679
- Medicare enrollment
- Enrolled (PECOS I20141014000345); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 56 Franklin St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ken Matsuo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 53316Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
85 Medicare Part D claims for 35 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $190.51
9 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Galen Inpatient Physicians PCWaterbury, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ken Matsuo among 2,623 internal medicine physician records in Connecticut
Ken Matsuo, MD is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 64% of them.
- NPI issued2011 · 64% of these records are older, 33% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2011 · median 2004 among the 1,646 with a school on file
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
119 internal medicine physician records list a practice address in Waterbury
They are 119 of the 3,148 NPPES records with a practice address in Waterbury, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Waterbury → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Shawnette Alston, MDWaterbury, CT 067061568495604
- Sondra Bogursky, MDWaterbury, CT 067061790711059
- Ann Conti-Kelly, M.D.Waterbury, CT 067061730283110
- Leslie Coopersmith, MDWaterbury, CT 067061801844147
- Melisha CumberlandWaterbury, CT 067061073704813
- Samer Ein Alshaeba, M.D.Waterbury, CT 067061477591097
- Franco Galasso, MDWaterbury, CT 067061174573539
- Chalmers Hamill, MDWaterbury, CT 067061578589370
Common questions
What is Ken Matsuo, MD's NPI number?
Ken Matsuo, MD's National Provider Identifier (NPI) is 1053600429, issued on Apr 6, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Ken Matsuo, MD located?
The NPPES record lists a practice address at 56 Franklin St, Waterbury, CT, 06706. Phone: (203) 709-8820. Providers update this record themselves, so call before visiting.
How can I verify Ken Matsuo, MD's license?
NPPES lists Connecticut license number 53316, 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.
How much does Ken Matsuo, MD prescribe under Medicare Part D?
In 2024, Ken Matsuo, MD had 85 Medicare Part D claims for 35 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.