2026 NPPES data Obstetrics & Gynecology Physician NPI 1306926704 MD
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GLEN MACKENZIE, MD

Obstetrics & Gynecology Physician in MANCHESTER CENTER, Vermont. 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
327
Medicare Part D claims · 58 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
92%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

GLEN MACKENZIE, MD filed 327 Medicare Part D claims in 2023 as a Obstetrics & Gynecology Physician in MANCHESTER CENTER, Vermont, prescribing 92% generic.

327
Part D claims, 2023
92%
generic prescribing

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.

GLEN MACKENZIE, MD's Medicare Part D volume vs every U.S. prescriber

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

327 Top 43% higher than 57% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). This entry sits in this band. 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-eligible specialty (heuristic — not verified)

GLEN MACKENZIE, MD 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 GLEN MACKENZIE, MD?

Quality data not reported

NPI registry status

Active

Issued 10/17/2006

NPI 1306926704

Primary specialty

Obstetrics & Gynecology Physician

Mid-sized

44,313 US NPIs in this specialty

Medicare Part D claims

327 83% vs specialty avg

2023 prescription claims

Specialty avg: 179

Specialty distribution in Vermont

How Obstetrics & Gynecology Physician compares to other specialties among Vermont providers

Vermont providers

Obstetrics & Gynecology Physician share within Vermont

1. Obstetrics & Gynecology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Obstetrics & Gynecology Physician share within Vermont

Specialty board-certification context

Estimated specialty board-certified rate — Obstetrics & Gynecology Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Obstetrics & Gynecology Physician ABMS/AOA estimate

Est. board-certified rate (Obstetrics & Gynecology Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Obstetrics & Gynecology 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).

GLEN MACKENZIE, MD appears in the CMS NPPES registry as a Obstetrics & Gynecology Physician provider holding MD credentials at 1009 DEPOT ST, MANCHESTER CENTER, VT, 05255, with a listed phone of (802) 442-8649. NPI 1306926704 was issued on 10/17/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MACKENZIE 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 327 prescription claims written by this provider, covering 58 Medicare beneficiaries and totaling roughly $41K in drug spend, split 8% brand-name and 92% 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.

Obstetrics & Gynecology Physician is a mid-sized specialty nationwide, with 44,313 enrolled providers across 56 states and an average of 179 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

1009 DEPOT ST
MANCHESTER CENTER, VT 05255

Provider Details

NPI 1306926704
Specialty Obstetrics & Gynecology Physician
Credentials MD
Gender Male
NPI Issued 10/17/2006

Brand vs generic prescribing mix · Generic-heavy

GLEN MACKENZIE, MD — brand share 8.0%
Specialty average (est.)

8% brand-name claims vs 92% generic, on 327 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.

327
Total Claims
$41K
Total Drug Cost
58
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
648
Total Day Supply
18,380
Brand vs Generic
8% brand / 92% generic
Brand Drug Cost
$18K
Generic Drug Cost
$23K

Patient Demographics

Average Patient Age
63.8 years
Avg HCC Risk Score
0.66
Gender Split
100% female / 0% male
Age Distribution
<65: 18, 65-74: 31, 75-84: N/A, 85+: N/A

Top Prescribed Drugs (Medicare Part D)

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

What GLEN MACKENZIE, MD prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Estradiol
43
Norethindrone Acetate
37
Pregabalin
23
Tranylcypromine Sulfate
18
Mirtazapine
16
Raloxifene Hcl
16
Progesterone
"Progesterone
N/A

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

Obstetrics & Gynecology Physician Overview

How GLEN MACKENZIE, MD fits within the Obstetrics & Gynecology Physician landscape nationally.

44,313
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider

GLEN MACKENZIE, MD's 327 claims are above the specialty average of 179.

Nearby Obstetrics & Gynecology Physician Providers in Vermont

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

Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is GLEN MACKENZIE, MD's specialty?
GLEN MACKENZIE, MD specializes in Obstetrics & Gynecology Physician and practices in MANCHESTER CENTER, Vermont. Credentials: MD.
How much does GLEN MACKENZIE, MD prescribe under Medicare Part D?
In 2023, GLEN MACKENZIE, MD wrote 327 Medicare Part D claims totaling $41K in drug costs for 58 beneficiaries.
Where is GLEN MACKENZIE, MD located?
GLEN MACKENZIE, MD is located at 1009 DEPOT ST, MANCHESTER CENTER, VT, 05255. Phone: (802) 442-8649.
What is GLEN MACKENZIE, MD's NPI number?
GLEN MACKENZIE, MD's National Provider Identifier (NPI) is 1306926704, issued on 10/17/2006.
Does GLEN MACKENZIE, MD prescribe more brand-name or generic drugs?
GLEN MACKENZIE, MD's prescribing is 8% brand-name and 92% generic drugs by claim count, with $18K in brand drug costs.
How many Obstetrics & Gynecology Physician providers are there in the US?
There are 44,313 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does GLEN MACKENZIE, MD prescribe most often?
Based on 2023 Medicare Part D data, GLEN MACKENZIE, MD's most frequently prescribed drugs include Estradiol, Norethindrone Acetate, Pregabalin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does GLEN MACKENZIE, MD accept Medicare?
GLEN MACKENZIE, MD appears in CMS Medicare data with 327 Part D claims and 58 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify GLEN MACKENZIE, MD's credentials?
GLEN MACKENZIE, MD's NPI is 1306926704 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