2026 NPPES data Emergency Medicine Physician NPI 1104025832 MD
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WILLIAM GREGORIE, MD

Emergency Medicine Physician in LEWISTON, Maine. 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.
Prescribing volume
13
Medicare Part D claims · 13 beneficiaries · Emergency Medicine Physician avg: 352

What the federal data shows

WILLIAM GREGORIE, MD filed 13 Medicare Part D claims in 2023 as a Emergency Medicine Physician in LEWISTON, Maine.

13
Part D claims, 2023
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.

WILLIAM GREGORIE, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

13 0th percentile higher than 0% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. 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.

Source CMS Medicare Part D Prescriber Public Use File · 2023

Board certification likely (heuristic — not verified)

WILLIAM GREGORIE, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 WILLIAM GREGORIE, MD?

Quality data not reported

NPI registry status

Active

Issued 07/12/2007

NPI 1104025832

Primary specialty

Emergency Medicine Physician

High-volume

64,398 US NPIs in this specialty

Medicare Part D claims

13 96% vs specialty avg

2023 prescription claims

Specialty avg: 352

Specialty distribution in Maine

How Emergency Medicine Physician compares to other specialties among Maine providers

Maine providers

Emergency Medicine Physician share within Maine

1. Emergency Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Emergency Medicine Physician share within Maine

Specialty board-certification context

Estimated specialty board-certified rate — Emergency Medicine Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Emergency Medicine Physician ABMS/AOA estimate

Est. board-certified rate (Emergency Medicine Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Emergency Medicine 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).

WILLIAM GREGORIE, MD appears in the CMS NPPES registry as a Emergency Medicine Physician provider holding MD credentials at 300 MAIN ST, LEWISTON, ME, 04240, with a listed phone of (207) 795-0111. NPI 1104025832 was issued on 07/12/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GREGORIE 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 records for calendar year 2023 show 13 prescription claims written by this provider, covering 13 Medicare beneficiaries and totaling roughly $63 in drug spend. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Emergency Medicine Physician is a high-volume specialty nationwide, with 64,398 enrolled providers across 56 states and an average of 352 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

300 MAIN ST
LEWISTON, ME 04240

Provider Details

NPI 1104025832
Specialty Emergency Medicine Physician
Credentials MD
Gender Male
NPI Issued 07/12/2007

Hospital and facility affiliations

Facilities where WILLIAM GREGORIE, MD 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.

TENNESSEE RIVER PHYSICIANS, PLLC
CHATTANOOGA, TN

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

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

13
Total Claims
$63
Total Drug Cost
13
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
13
Total Day Supply
83
Brand Drug Cost
$0
Generic Drug Cost
$63

Patient Demographics

Average Patient Age
71.7 years
Avg HCC Risk Score
0.89

Emergency Medicine Physician Overview

How WILLIAM GREGORIE, MD fits within the Emergency Medicine Physician landscape nationally.

64,398
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider

WILLIAM GREGORIE, MD's 13 claims are below the specialty average of 352.

Nearby Emergency Medicine Physician Providers in Maine

Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as GREGORIE.

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

Frequently Asked Questions

What is WILLIAM GREGORIE, MD's specialty?
WILLIAM GREGORIE, MD specializes in Emergency Medicine Physician and practices in LEWISTON, Maine. Credentials: MD.
How much does WILLIAM GREGORIE, MD prescribe under Medicare Part D?
In 2023, WILLIAM GREGORIE, MD wrote 13 Medicare Part D claims totaling $63 in drug costs for 13 beneficiaries.
Where is WILLIAM GREGORIE, MD located?
WILLIAM GREGORIE, MD is located at 300 MAIN ST, LEWISTON, ME, 04240. Phone: (207) 795-0111.
What is WILLIAM GREGORIE, MD's NPI number?
WILLIAM GREGORIE, MD's National Provider Identifier (NPI) is 1104025832, issued on 07/12/2007.
How many Emergency Medicine Physician providers are there in the US?
There are 64,398 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
Does WILLIAM GREGORIE, MD accept Medicare?
WILLIAM GREGORIE, MD appears in CMS Medicare data with 13 Part D claims and 13 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify WILLIAM GREGORIE, MD's credentials?
WILLIAM GREGORIE, MD's NPI is 1104025832 with credentials MD. 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.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
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