Dennis O'Brien, MD
NPI 1952449829 · Internal Medicine Physician · Ticonderoga, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis O'Brien, MD is a Internal Medicine Physician provider in Ticonderoga, NY (NPI 1952449829).
Provider details
- NPI number
- 1952449829
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 154766 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 56 | 21 |
| Atorvastatin Calcium | 42 | 20 |
| Losartan Potassium | 35 | 14 |
| Simvastatin | 23 | — |
| Rosuvastatin Calcium | 19 | — |
| Metoprolol Succinate | 17 | — |
| Hydrochlorothiazide | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$89 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-02
- Last updated
- 2018-11-09
Frequently asked questions
- What is Dennis O'Brien's NPI number?
- Dennis O'Brien's National Provider Identifier (NPI) is 1952449829, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis O'Brien's specialty?
- Dennis O'Brien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis O'Brien located?
- Dennis O'Brien's practice location on file with NPPES is 102 Race Track Rd Ste 1, Ticonderoga, NY 12883-4004.
- What is Dennis O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Dennis O'Brien is (518) 585-6708.
- Does Dennis O'Brien accept Medicare?
- Dennis O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dennis O'Brien's NPI active?
- Yes — Dennis O'Brien's NPI (1952449829) is active in the NPPES registry as of the last update on 2018-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.