Mario F. Flores, MD
Internal Medicine Physician · Southborough, MA
Mario F. Flores, MD is an internal medicine physician with a practice address in Southborough, Massachusetts, and NPI 1437103439, issued on May 22, 2006. Check the license (Massachusetts 151100, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mario F. Flores
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 151100 MA
Self-reported in NPPES; status is on the state search - Practice location
- 24 Newton St, Southborough, MA 01772
- Phone
- (508) 481-5500
- Enumerated
- May 22, 2006
- Record last updated
- Feb 4, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicaid ID
- 3161064 MA
- Medicare enrollment
- Enrolled (PECOS I20050318000133); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 24 Newton St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sarah Bechta, M.D.Pediatrics Physician1932124427
Verify Mario F. Flores in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 151100Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% more Medicare Part D claims than the average internal medicine physician in 2024
3,636 Medicare Part D claims for 228 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 61 claims were for opioids.
Most prescribed
- Atorvastatin Calcium283 claims
- Levothyroxine Sodium124 claims
- Losartan Potassium123 claims
- Amlodipine Besylate109 claims
- Lisinopril108 claims
- Rosuvastatin Calcium102 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: $87.47
4 payments; by number, the most common kind was food and beverage; the largest payer was Otsuka America Pharmaceutical, 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
- Charles River Medical Associates, PCWestborough, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mario F. Flores among 6,825 internal medicine physician records in Massachusetts
Mario F. Flores, MD is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1992 · median 2004 among the 4,103 with a school on file
- Record last updated2014 · 64% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 internal medicine physician records list a practice address in Southborough
They are 12 of the 481 NPPES records with a practice address in Southborough, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Southborough → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hassna Atlassi, MDSouthborough, MA 017721326107541
- Matthew Bean, M.D.Southborough, MA 017721730107244
- Frank Chau, M.D.Southborough, MA 017721003840315
- Justin Dorfman, D.O.Southborough, MA 017721053339432
- Deidre Hein, DOSouthborough, MA 017721184023103
- James Howe, M.D.Southboro, MA 017721467499129
- Robert Jandl, M.D.Southborough, MA 017721770572315
- Javeria Kouser, M.DSouthborough, MA 017721801062104
Common questions
What is Mario F. Flores, MD's NPI number?
Mario F. Flores, MD's National Provider Identifier (NPI) is 1437103439, issued on May 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mario F. Flores, MD located?
The NPPES record lists a practice address at 24 Newton St, Southborough, MA, 01772. Phone: (508) 481-5500. Providers update this record themselves, so call before visiting.
How can I verify Mario F. Flores, MD's license?
NPPES lists Massachusetts license number 151100, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mario F. Flores, MD prescribe under Medicare Part D?
In 2024, Mario F. Flores, MD had 3,636 Medicare Part D claims for 228 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.