Dennis S. O'Brien, MD
Internal Medicine Physician · Ticonderoga, NY
Dennis S. O'Brien, MD is an internal medicine physician with a practice address in Ticonderoga, New York, and NPI 1952449829, issued on Feb 2, 2007. Check the license (New York 154766, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Dennis S. O'Brien
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 154766 NY
Self-reported in NPPES; status is on the state search - Practice location
- 102 Race Track RD Ste 1, Ticonderoga, NY 12883
- Phone
- (518) 585-6708
- Enumerated
- Feb 2, 2007
- Record last updated
- Nov 9, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (518) 585-3260
- Medicaid ID
- 00774992 NY
- Entity
- Type 1 · individual
Verify Dennis S. O'Brien 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 154766Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average internal medicine physician in 2024
637 Medicare Part D claims for 128 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate56 claims
- Atorvastatin Calcium42 claims
- Losartan Potassium35 claims
- Simvastatin23 claims
- Rosuvastatin Calcium19 claims
- Metoprolol Succinate17 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: $89.43
5 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. 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.
1 internal medicine physician records list a practice address in Ticonderoga
They are 1 of the 69 NPPES records with a practice address in Ticonderoga, and 12,067 internal medicine physician records in New York.
Other internal medicine physician records in New York
- Deborah Aanonsen, D.O.Staten Island, NY1952395717
- Nivedita Aanur, M.D.New York, NY1982833471
- Jay Aaron, MDGreat Neck, NY1245332956
- Ahmad AbadiPoughkeepsie, NY1780258517
- Jamsheed Abadi, MDBrooklyn, NY1477537496
- Antonieta Abarientos, MDNew Rochelle, NY1649285123
- Zurab Abayev, M.D.Brooklyn, NY1841283058
- Ehab Abaza, MDNew York, NY1114507555
- Vaidarshi Abbagoni, MDNew York, NY1871237495
- Muhammad AbbasRichmond Hill, NY1053996587
Common questions
What is Dennis S. O'Brien, MD's NPI number?
Dennis S. O'Brien, MD's National Provider Identifier (NPI) is 1952449829, issued on Feb 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Dennis S. O'Brien, MD located?
The NPPES record lists a practice address at 102 Race Track RD Ste 1, Ticonderoga, NY, 12883. Phone: (518) 585-6708. Providers update this record themselves, so call before visiting.
How can I verify Dennis S. O'Brien, MD's license?
NPPES lists New York license number 154766, 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 Dennis S. O'Brien, MD prescribe under Medicare Part D?
In 2024, Dennis S. O'Brien, MD had 637 Medicare Part D claims for 128 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.