Sean O'Brien, D.O.
NPI 1912994500 · Internal Medicine Physician · Nogales, AZ
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean O'Brien, D.O. is a Internal Medicine Physician provider in Nogales, AZ (NPI 1912994500).
Provider details
- NPI number
- 1912994500
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 2883 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 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 · 69 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 238 | 84 |
| Metformin Hcl | 216 | 76 |
| Lisinopril | 167 | 55 |
| Dulaglutidebrand: Trulicity | 149 | 24 |
| Amlodipine Besylate | 141 | 56 |
| Levothyroxine Sodium | 123 | 38 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$37 across 2 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
- 2005-09-29
- Last updated
- 2024-01-17
- Certified
- 2024-01-17
Frequently asked questions
- What is Sean O'Brien's NPI number?
- Sean O'Brien's National Provider Identifier (NPI) is 1912994500, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean O'Brien's specialty?
- Sean O'Brien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sean O'Brien located?
- Sean O'Brien's practice location on file with NPPES is 3231 N Grand Ave, Nogales, AZ 85621-3905.
- What is Sean O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Sean O'Brien is (520) 281-1550.
- Does Sean O'Brien accept Medicare?
- Sean 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 Sean O'Brien's NPI active?
- Yes — Sean O'Brien's NPI (1912994500) is active in the NPPES registry as of the last update on 2024-01-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.