Matthew Dalton Simson, M.D.
Internal Medicine Physician · Rochester, NY
Matthew Dalton Simson, M.D. is an internal medicine physician with a practice address in Rochester, New York, and NPI 1245812403, issued on Apr 26, 2021. Check the license (New York 337874, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Matthew Dalton Simson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 337874 NY
Self-reported in NPPES; status is on the state search - Practice location
- 601 Elmwood Avenue, Rochester, NY 14642
- Phone
- (585) 275-4290
- Enumerated
- Apr 26, 2021
- Record last updated
- Aug 7, 2026
- Fax
- (585) 473-1573
- Medicare enrollment
- Enrolled (PECOS I20260506002455); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 601 Elmwood Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Matthew Dalton Simson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 337874Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
403 Medicare Part D claims for 71 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium43 claims
- Gabapentin35 claims
- Eliquis20 claims
- Metoprolol Succinate16 claims
- Rosuvastatin Calcium16 claims
- Amlodipine Besylate15 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.
Matthew Dalton Simson among 12,067 internal medicine physician records in New York
Matthew Dalton Simson, M.D. is one of 12,067 internal medicine physician records with a practice address in New York. 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 2021, is newer than 91% of them.
- NPI issued2021 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2021 · median 2002 among the 7,221 with a school on file
- Record last updated2026 · 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
504 internal medicine physician records list a practice address in Rochester
They are 504 of the 20,520 NPPES records with a practice address in Rochester, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Rochester → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Clayton Baker, MDRochester, NY 146421780613216
- Marc Berliant, MDRochester, NY 146421154324317
- Donald Bordley, MDRochester, NY 146421740205095
- Nancy Clark, M.D.Rochester, NY 146421538198866
- Elizabeth Edwardsen, M.D.Rochester, NY 146421306862644
- Aniko Fellegi, M.D.Rochester, NY 146421457343667
- John Grable, MDRochester, NY 146421427090026
- Catherine Gracey, MDRochester, NY 146421336185917
Common questions
What is Matthew Dalton Simson, M.D.'s NPI number?
Matthew Dalton Simson, M.D.'s National Provider Identifier (NPI) is 1245812403, issued on Apr 26, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Dalton Simson, M.D. located?
The NPPES record lists a practice address at 601 Elmwood Avenue, Rochester, NY, 14642. Phone: (585) 275-4290. Providers update this record themselves, so call before visiting.
How can I verify Matthew Dalton Simson, M.D.'s license?
NPPES lists New York license number 337874, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Matthew Dalton Simson, M.D. prescribe under Medicare Part D?
In 2024, Matthew Dalton Simson, M.D. had 403 Medicare Part D claims for 71 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.