Brian O'Leary, MD
NPI 1295702439 · Internal Medicine Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brian O'Leary, MD is a Internal Medicine Physician provider in Naperville, IL (NPI 1295702439).
Provider details
- NPI number
- 1295702439
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036073069 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,040 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 241 | $130 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 165 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 115 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 70 | $13 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 67 | $133 |
| Hemoglobin A1c Level83036 | 61 | $10 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 171 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 590 | 159 |
| Levothyroxine Sodium | 388 | 97 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 376 | 71 |
| Rosuvastatin Calcium | 318 | 91 |
| Losartan Potassium | 315 | 93 |
| Amlodipine Besylate | 308 | 85 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$405 across 22 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
- 2006-03-07
- Last updated
- 2021-09-24
- Certified
- 2021-09-24
Frequently asked questions
- What is Brian O'Leary's NPI number?
- Brian O'Leary's National Provider Identifier (NPI) is 1295702439, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brian O'Leary's specialty?
- Brian O'Leary is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Brian O'Leary located?
- Brian O'Leary's practice location on file with NPPES is 1964 Springbrook Square Dr, Naperville, IL 60564-5949.
- What is Brian O'Leary's phone number?
- The practice phone number listed in the NPPES registry for Brian O'Leary is (630) 946-2565.
- Does Brian O'Leary accept Medicare?
- Brian O'Leary is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brian O'Leary's NPI active?
- Yes — Brian O'Leary's NPI (1295702439) is active in the NPPES registry as of the last update on 2021-09-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.