2026 NPPES data Molecular Genetic Pathology (Pathology) Physician NPI 1003899873 MD, PHD
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TIMOTHY O'LEARY, MD, PHD

Molecular Genetic Pathology (Pathology) Physician in CHESAPEAKE BEACH, Maryland. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.

What the federal data shows

TIMOTHY O'LEARY, MD, PHD is a Molecular Genetic Pathology (Pathology) Physician in CHESAPEAKE BEACH, Maryland, listed in the federal CMS National Provider Identifier registry.

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.

Board-eligible specialty (heuristic — not verified)

TIMOTHY O'LEARY, MD, PHD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about TIMOTHY O'LEARY, MD, PHD?

Quality data not reported

NPI registry status

Active

Issued 11/24/2005

NPI 1003899873

Primary specialty

Molecular Genetic Pathology (Pathology) Physician

Rare

200 US NPIs in this specialty

Specialty distribution in Maryland

How Molecular Genetic Pathology (Pathology) Physician compares to other specialties among Maryland providers

Maryland providers

Molecular Genetic Pathology (Pathology) Physician share within Maryland

1. Molecular Genetic Pathology (Pathology) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Molecular Genetic Pathology (Pathology) Physician share within Maryland

Specialty board-certification context

Estimated specialty board-certified rate — Molecular Genetic Pathology (Pathology) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Molecular Genetic Pathology (Pathology) Physician ABMS/AOA estimate

Est. board-certified rate (Molecular Genetic Pathology (Pathology) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Molecular Genetic Pathology (Pathology) Physician) — ABMS / AOA estimate

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).

TIMOTHY O'LEARY, MD, PHD appears in the CMS NPPES registry as a Molecular Genetic Pathology (Pathology) Physician provider holding MD, PHD credentials at 4755 CAMP ROOSEVELT DRIVE, CHESAPEAKE BEACH, MD, 20732, with a listed phone of (240) 460-0271. NPI 1003899873 was issued on 11/24/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what O'LEARY most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D prescribing data is not currently published for this NPI, which typically means the provider either wrote fewer than 11 Part D claims in the most recent reporting year, does not participate in Medicare, or practices in a specialty that rarely prescribes outpatient drugs. Absence of prescribing data is not a quality signal — many Molecular Genetic Pathology (Pathology) Physician providers operate outside Part D entirely.

Molecular Genetic Pathology (Pathology) Physician is a narrow specialty nationwide, with 200 enrolled providers across 36 states and an average of 16 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

4755 CAMP ROOSEVELT DRIVE
CHESAPEAKE BEACH, MD 20732

Provider Details

NPI 1003899873
Specialty Molecular Genetic Pathology (Pathology) Physician
Credentials MD, PHD
Gender Male
NPI Issued 11/24/2005

Molecular Genetic Pathology (Pathology) Physician Overview

How TIMOTHY O'LEARY, MD, PHD fits within the Molecular Genetic Pathology (Pathology) Physician landscape nationally.

200
Molecular Genetic Pathology (Pathology) Physician Providers in US
36
States with Molecular Genetic Pathology (Pathology) Physician
16
Avg Claims per Provider

Nearby Molecular Genetic Pathology (Pathology) Physician Providers in Maryland

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

Compare Molecular Genetic Pathology (Pathology) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is TIMOTHY O'LEARY, MD, PHD's specialty?
TIMOTHY O'LEARY, MD, PHD specializes in Molecular Genetic Pathology (Pathology) Physician and practices in CHESAPEAKE BEACH, Maryland. Credentials: MD, PHD.
Where is TIMOTHY O'LEARY, MD, PHD located?
TIMOTHY O'LEARY, MD, PHD is located at 4755 CAMP ROOSEVELT DRIVE, CHESAPEAKE BEACH, MD, 20732. Phone: (240) 460-0271.
What is TIMOTHY O'LEARY, MD, PHD's NPI number?
TIMOTHY O'LEARY, MD, PHD's National Provider Identifier (NPI) is 1003899873, issued on 11/24/2005.
How many Molecular Genetic Pathology (Pathology) Physician providers are there in the US?
There are 200 Molecular Genetic Pathology (Pathology) Physician providers across 36 states in the US. The average Molecular Genetic Pathology (Pathology) Physician provider writes 16 Medicare Part D claims per year.
Does TIMOTHY O'LEARY, MD, PHD accept Medicare?
TIMOTHY O'LEARY, MD, PHD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify TIMOTHY O'LEARY, MD, PHD's credentials?
TIMOTHY O'LEARY, MD, PHD's NPI is 1003899873 with credentials MD, PHD. 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

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.
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 April 2026 (NPPES) / 2023 (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