2026 NPPES data Cornea and External Diseases Specialist Physician NPI 1639673676 MD
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JAMES GREGOIRE, MD

Cornea and External Diseases Specialist Physician in BROOKLINE, Massachusetts. 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
154
Medicare Part D claims · 92 beneficiaries · Cornea and External Diseases Specialist Physician avg: 1K
Generic prescribing
61%
generic claims · 39% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$491.73
23 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: JAMES GREGOIRE, MD is a Cornea and External Diseases Specialist Physician ([object Object]) practicing in BROOKLINE, Massachusetts with a Medicare Part D prescribing footprint of 154 claims across 92 beneficiaries — 39% brand-name prescribing . Industry payments of $491.73 across 23 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: JAMES GREGOIRE, MD filed 154 Medicare Part D claims in 2023 across BROOKLINE, Massachusetts. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

JAMES GREGOIRE, 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).

JAMES GREGOIRE, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 03/23/2018

NPI 1639673676

Primary specialty

Cornea and External Diseases Specialist Physician

Rare

294 US NPIs in this specialty

Medicare Part D claims

154 87% vs specialty avg

2023 prescription claims

Specialty avg: 1,232

Specialty distribution in Massachusetts

How Cornea and External Diseases Specialist Physician compares to other specialties among Massachusetts providers

Massachusetts providers

Cornea and External Diseases Specialist Physician share within Massachusetts

1. Cornea and External Diseases Specialist Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Cornea and External Diseases Specialist Physician share within Massachusetts

Specialty board-certification context

Estimated specialty board-certified rate — Cornea and External Diseases Specialist Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Cornea and External Diseases Specialist Physician ABMS/AOA estimate

Est. board-certified rate (Cornea and External Diseases Specialist Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Cornea and External Diseases Specialist 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).

JAMES GREGOIRE, MD is a Cornea and External Diseases Specialist Physician provider practicing in BROOKLINE, Massachusetts, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1639673676. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

JAMES GREGOIRE, MD appears in the CMS NPPES registry as a Cornea and External Diseases Specialist Physician provider holding MD credentials at 24 WEBSTER PL, BROOKLINE, MA, 02445, with a listed phone of (617) 202-2020. NPI 1639673676 was issued on 03/23/2018. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GREGOIRE 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 154 prescription claims written by this provider, covering 92 Medicare beneficiaries and totaling roughly $25K in drug spend, split 39% brand-name and 61% generic by claim count. 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.

Cornea and External Diseases Specialist Physician is a narrow specialty nationwide, with 294 enrolled providers across 43 states and an average of 1,232 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

24 WEBSTER PL
BROOKLINE, MA 02445

Provider Details

NPI 1639673676
Specialty Cornea and External Diseases Specialist Physician
Credentials MD
Gender Male
NPI Issued 03/23/2018

Hospital and facility affiliations

Facilities where JAMES GREGOIRE, 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.

BOSTON LASER EYE INSTITUTE PC
BROOKLINE, 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).

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for JAMES GREGOIRE, MD. Source: openpaymentsdata.cms.gov.

Total received

$492

Largest payer

ABBVIE INC.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

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 JAMES GREGOIRE, MD. To verify JAMES GREGOIRE, MD'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 · Above average

JAMES GREGOIRE, MD — brand share 39.0%
Specialty average (est.)

39% brand-name claims vs 61% generic, on 154 2023 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 2023.

154
Total Claims
$25K
Total Drug Cost
92
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
225
Total Day Supply
5,932
Brand vs Generic
39% brand / 61% generic
Brand Drug Cost
$22K
Generic Drug Cost
$3K

Patient Demographics

Average Patient Age
72.9 years
Avg HCC Risk Score
1.31
Gender Split
55% female / 45% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Ketorolac Tromethamine
29
Prednisolone Acetate
21
Latanoprost
19
Moxifloxacin
Moxifloxacin Hcl
11

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

Cornea and External Diseases Specialist Physician Overview

How JAMES GREGOIRE, MD fits within the Cornea and External Diseases Specialist Physician landscape nationally.

294
Cornea and External Diseases Specialist Physician Providers in US
43
States with Cornea and External Diseases Specialist Physician
1,232
Avg Claims per Provider

JAMES GREGOIRE, MD's 154 claims are below the specialty average of 1,232.

Nearby Cornea and External Diseases Specialist Physician Providers in Massachusetts

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

Compare Cornea and External Diseases Specialist Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is JAMES GREGOIRE, MD's specialty?
JAMES GREGOIRE, MD specializes in Cornea and External Diseases Specialist Physician and practices in BROOKLINE, Massachusetts. Credentials: MD.
How much does JAMES GREGOIRE, MD prescribe under Medicare Part D?
In 2023, JAMES GREGOIRE, MD wrote 154 Medicare Part D claims totaling $25K in drug costs for 92 beneficiaries.
Where is JAMES GREGOIRE, MD located?
JAMES GREGOIRE, MD is located at 24 WEBSTER PL, BROOKLINE, MA, 02445. Phone: (617) 202-2020.
What is JAMES GREGOIRE, MD's NPI number?
JAMES GREGOIRE, MD's National Provider Identifier (NPI) is 1639673676, issued on 03/23/2018.
Does JAMES GREGOIRE, MD prescribe more brand-name or generic drugs?
JAMES GREGOIRE, MD's prescribing is 39% brand-name and 61% generic drugs by claim count, with $22K in brand drug costs.
How many Cornea and External Diseases Specialist Physician providers are there in the US?
There are 294 Cornea and External Diseases Specialist Physician providers across 43 states in the US. The average Cornea and External Diseases Specialist Physician provider writes 1,232 Medicare Part D claims per year.
What drugs does JAMES GREGOIRE, MD prescribe most often?
Based on 2023 Medicare Part D data, JAMES GREGOIRE, MD's most frequently prescribed drugs include Ketorolac Tromethamine, Prednisolone Acetate, Latanoprost. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JAMES GREGOIRE, MD accept Medicare?
JAMES GREGOIRE, MD appears in CMS Medicare data with 154 Part D claims and 92 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JAMES GREGOIRE, MD's credentials?
JAMES GREGOIRE, MD's NPI is 1639673676 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