Mark Shannon, M.D.
Internal Medicine Physician · Barrington, RI
Mark Shannon, M.D. is an internal medicine physician with a practice address in Barrington, Rhode Island, and NPI 1508941089, issued on Oct 25, 2006. Check the license (Rhode Island MD7250, as entered in NPPES) on the Rhode Island Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Mark Shannon
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD7250 RI
Self-reported in NPPES; status is on the state search - Practice location
- 42 Lincoln Ave, Barrington, RI 02806
- Phone
- (401) 246-0389
- Enumerated
- Oct 25, 2006
- Record last updated
- Jun 12, 2026
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,033 in Rhode Island → Look up another NPI →
Verify Mark Shannon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersRhode Island Board of Medical Licensure and Discipline
Search for license MD7250Check 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
107 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims.
Most prescribed
- Eliquis27 claims
- Furosemide25 claims
- Spironolactone14 claims
- Finasteride13 claims
- Atorvastatin Calcium12 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.
Mark Shannon among 1,033 internal medicine physician records in Rhode Island
Mark Shannon, M.D. is one of 1,033 internal medicine physician records with a practice address in Rhode Island. 80% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 62% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2026 · 48% 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 Rhode Island practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Barrington
They are 3 of the 244 NPPES records with a practice address in Barrington, and 1,033 internal medicine physician records in Rhode Island.
All 1,033 in Rhode Island → Every provider in Barrington → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Frank Capizzo, MD.Barrington, RI 028061992812093
- Allen Dennison, M.D.Barrington, RI 028061356342323
- Paul Agatiello, M.D.Bristol, RI 028091407961196
- Michael Baaklini, MDBristol, RI 028091922119411
- Cassandra Constantino, MDBristol, RI 028091598766537
- Bruce Fischer, MDBristol, RI 028091598766552
- Margaret Furtado, MDBristol, RI 028091831141498
- Geoffrey Hamilton, MDBristol, RI 028091467453431
Common questions
What is Mark Shannon, M.D.'s NPI number?
Mark Shannon, M.D.'s National Provider Identifier (NPI) is 1508941089, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Shannon, M.D. located?
The NPPES record lists a practice address at 42 Lincoln Ave, Barrington, RI, 02806. Phone: (401) 246-0389. Providers update this record themselves, so call before visiting.
How can I verify Mark Shannon, M.D.'s license?
NPPES lists Rhode Island license number MD7250, as entered by the provider. Search the Rhode Island Board of Medical Licensure and Discipline at https://healthri.mylicense.com/Verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Shannon, M.D. prescribe under Medicare Part D?
In 2024, Mark Shannon, M.D. had 107 Medicare Part D claims; 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.