Daniel O'Leary, M.D.
NPI 1447346531 · Internal Medicine Physician · Leominster, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel O'Leary, M.D. is a Internal Medicine Physician provider in Leominster, MA (NPI 1447346531).
Provider details
- NPI number
- 1447346531
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 57335 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,400 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 1,002 | $131 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 437 | $134 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 424 | $93 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 96 | $186 |
| Advance Care Planning, First 30 Minutes99497 | 83 | $84 |
| Transitional Care Management Services for Problem of High Complexity99496 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 147 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 954 | 268 |
| Amlodipine Besylate | 794 | 223 |
| Lisinopril | 762 | 218 |
| Losartan Potassium | 761 | 203 |
| Levothyroxine Sodium | 759 | 200 |
| Simvastatin | 540 | 148 |
| Omeprazole | 501 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-05
- Last updated
- 2013-02-28
Frequently asked questions
- What is Daniel O'Leary's NPI number?
- Daniel O'Leary's National Provider Identifier (NPI) is 1447346531, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel O'Leary's specialty?
- Daniel O'Leary is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel O'Leary located?
- Daniel O'Leary's practice location on file with NPPES is 50 Memorial Drive, Leominster, MA 01453.
- What is Daniel O'Leary's phone number?
- The practice phone number listed in the NPPES registry for Daniel O'Leary is (978) 534-4241.
- Does Daniel O'Leary accept Medicare?
- Daniel 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 Daniel O'Leary's NPI active?
- Yes — Daniel O'Leary's NPI (1447346531) is active in the NPPES registry as of the last update on 2013-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.