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2026 NPPES data Internal Medicine Physician NPI 1447346531 M.D.
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Daniel O'Leary, M.D.

Internal Medicine Physician in Leominster, Massachusetts.

This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 174,792 in Internal Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.

Federal data, no proprietary rating. We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
16K
Medicare Part D claims · 1K beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
97/100
▲ 14 pts above national avg 83.5 · Exceptional
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Daniel O'Leary, M.D. reported a CMS MIPS final score of 97/100 - above the 83.5 national average - and filed 16,274 Medicare Part D claims in 2024.

97/100
MIPS score · +14 vs avg
16K
Part D claims, 2024
91%
generic prescribing
Likely
board-certified (heuristic)

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.

Federal trust snapshot

What official records show about Daniel O'Leary, M.D.

Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.

  • Verified

    NPI registry status

    Active listing in the CMS National Provider Identifier Registry (NPI 1447346531), first enumerated 10/05/2006.

    Source: CMS NPPES

  • Reported

    Medicare Part D participation

    Filed 16,274 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.

    Source: CMS Part D Prescriber PUF

  • Reported

    CMS quality reporting (MIPS)

    Reported a CMS MIPS final score of 97/100 in the Quality Payment Program — a federal quality measure, not a patient review.

    Source: CMS Quality Payment Program

  • Reported

    Board certification signal

    Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.

    Source: NUCC taxonomy + CMS participation heuristic

  • Reported

    Hospital affiliations

    1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.

    Source: CMS Care Compare

  • State context

    State board disciplinary context

    Massachusetts statewide board action statistics are published annually — these figures describe aggregate state activity, not Daniel O'Leary, M.D.'s individual license status. Verify directly with the state medical board.

    Source: BORIM annual report 2023

  • Not in federal data

    Individual sanction lookup

    PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.

    Source: State medical board / FSMB

This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.

CMS NPPES provider registry desk

NPI 1447346531 · Internal Medicine Physician

NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-ELITE · RX-HEAVY · BOOK-MID · PHOTO-FINISH

  • NPI-10 1447346531
  • ENUM-LEGACY 2006
  • TAX-MEGA 175K Internal Medicine
  • MIPS-ELITE 97/100
  • RX-HEAVY 16K claims
  • BOOK-MID 7,865 in Massachusetts
  • PHOTO-FINISH Adarsha Bajracharya,… · ±0.0

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

Daniel O'Leary, M.D.'s MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

97 ≥ 84th percentile 84% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). Below this entry. 80–90: 129,887 measured providers (29%). Below this entry. 90+: 189,403 measured providers (42%). This entry sits in this band. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Where Daniel O'Leary, M.D. sits

This provider among internal medicine physician peers

Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Daniel O'Leary, M.D. writes more Part D claims than 98% of them and scores higher on MIPS quality than 84% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 17Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 27Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 25Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 87 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 2 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 62 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 77Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 33Daniel O'Leary, M.D., Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 84
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is Daniel O'Leary, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

Daniel O'Leary, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about Daniel O'Leary, M.D.?

High performer (top quartile)

NPI registry status

Active

Issued 10/05/2006

NPI 1447346531

Primary specialty

Internal Medicine Physician

High-volume

174,792 US NPIs in this specialty

Medicare Part D claims

16,274 6× vs specialty avg

2024 prescription claims

Specialty avg: 2,785

MIPS final score

97/100 13.5 pts vs avg

Exceptional band

vs 83.5 national avg

Specialty distribution in Massachusetts

How Internal Medicine Physician compares to other specialties among Massachusetts providers

Massachusetts providers
Mental Health Counselor8.3%Clinical Social Worker7.7%Student in an Organized Heal…6.2%Behavior Technician5.3%Counselor4.3%Internal Medicine Physician3.6%
Largest specialties in Massachusetts (% of in-state providers)

Medicare quality performance, MIPS

Daniel O'Leary, M.D.'s 2023 MIPS final score plotted against the Internal Medicine Physician national average

High performer (top quartile)
MIPS Final Score
97/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%97%
MIPS final score (Internal Medicine Physician) - 97/100 vs national avg 83.5
How MIPS and board certification work

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

Practice Address

50 MEMORIAL DRIVE
Leominster, MA 01453
(978) 534-4241

Provider Details

NPI 1447346531
Specialty Internal Medicine Physician
Credentials M.D.
Gender Male
NPI Issued 10/05/2006

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

97.0218
Final Score
Measured-score avg: 83.5
78.0983
Quality
100
Promoting Interoperability

Reporting: Alternative Payment Model

Hospital and facility affiliations

Facilities where Daniel O'Leary, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

Leominster Medical Associates
Leominster, MA

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

License & disciplinary context - Massachusetts BORIM 2023 annual report

Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Daniel O'Leary, M.D.. To verify Daniel O'Leary, M.D.'s current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases

BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Generic-heavy

Daniel O'Leary, M.D. - brand share 9.0%
Internal Medicine Physician average

9% brand-name claims vs 91% generic, on 16,274 2024 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2024.

16,274
Total Claims
$1.2M
Total Drug Cost
1,239
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
39,029.967
Total Day Supply
1,143,171
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$906K
Generic Drug Cost
$259K
Opioid Claims
341 (2.1% rate)
Antibiotic Claims
512

Patient Demographics

Average Patient Age
75.7 years
Avg HCC Risk Score
1.13
Gender Split
49% female / 51% male
Age Distribution
<65: 55, 65-74: 555, 75-84: 433, 85+: 196

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.

What Daniel O'Leary, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2024

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2024
Drug Claims
Atorvastatin Calcium
 954
Amlodipine Besylate
 794
Lisinopril
 762
Losartan Potassium
 761
Levothyroxine Sodium
 759
Simvastatin
 540
Omeprazole
 501
Hydrochlorothiazide
 469
Rosuvastatin Calcium
 377
Gabapentin
 367

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

More Internal Medicine Physician in MA → All providers in Massachusetts → Compare specialties →

Internal Medicine Physician Overview

How Daniel O'Leary, M.D. fits within the Internal Medicine Physician landscape nationally.

174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider

Daniel O'Leary, M.D.'s 16,274 claims are above the specialty average of 2,785.

Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year

Two federal-record peer sets for O'Leary, both outside Massachusetts so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (97 here).

Adarsha Bajracharya 97 CA Breta Boots 97 NY Timothy Cashman 97 PA Raphael Jesin 97 NY

Same NPPES enumeration year (2006)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

George Bailey Medford, OR Todd Gray Sterling, IL Parvin Peddi San Francisco, CA Ricky Heirigs North Platte, NE

Nearby Internal Medicine Physician Providers in Massachusetts

Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as O'Leary.

One of 7,865 Internal Medicine Physician providers enrolled in Massachusetts, 5 are shown here.

Dr. Nawal Aamir
MD
Worcester, MA
Zainab Abbas
Worcester, MA
Nooshin Abbasi
MD MPH
Newton, MA
Dr. Lauren Abbate
MD
Boston, MA
Dr. Bassima Abdallah
MD
Boston, MA

Compare Internal Medicine Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is Daniel O'Leary, M.D.'s specialty? ▼
Daniel O'Leary, M.D. specializes in Internal Medicine Physician and practices in Leominster, Massachusetts. Credentials: M.D..
How much does Daniel O'Leary, M.D. prescribe under Medicare Part D? ▼
In 2024, Daniel O'Leary, M.D. wrote 16,274 Medicare Part D claims totaling $1.2M in drug costs for 1,239 beneficiaries.
What is Daniel O'Leary, M.D.'s Medicare quality score? ▼
Daniel O'Leary, M.D. has a CMS MIPS Final Score of 97/100 (Quality: 78.1). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Daniel O'Leary, M.D. located? ▼
Daniel O'Leary, M.D. is located at 50 MEMORIAL DRIVE, Leominster, MA, 01453. Phone: (978) 534-4241.
What is Daniel O'Leary, M.D.'s NPI number? ▼
Daniel O'Leary, M.D.'s National Provider Identifier (NPI) is 1447346531, issued on 10/05/2006.
Does Daniel O'Leary, M.D. prescribe more brand-name or generic drugs? ▼
Daniel O'Leary, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $906K in brand drug costs.
Does Daniel O'Leary, M.D. prescribe opioids? ▼
Yes, Daniel O'Leary, M.D. had 341 opioid claims in 2024 with an opioid prescribing rate of 2.1%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Daniel O'Leary, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Daniel O'Leary, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Daniel O'Leary, M.D. accept Medicare? ▼
Daniel O'Leary, M.D. appears in CMS Medicare data with 16,274 Part D claims and 1,239 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Daniel O'Leary, M.D.'s credentials? ▼
Daniel O'Leary, M.D.'s NPI is 1447346531 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

View source datasets and methodology notes
Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.