NPI registry status
Active
2026 NPPES data Surgery Physician NPI 1326370123 M.D.
Verify on CMS → William McGregor, M.D.
Surgery Physician in Great Falls, Montana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 36,778 in Surgery 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
20
Medicare Part D claims · Surgery Physician avg: 174
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
William McGregor, M.D. filed 20 Medicare Part D claims in 2024 as a Surgery Physician in Great Falls, Montana.
- 20
- Part D claims, 2024
- ≥0th
- pct by Part D claim volume (lower-bound band)
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 William McGregor, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1326370123), first enumerated 02/03/2010.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 20 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- 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 1326370123 · Surgery Physician
NPI-10 · ENUM-MID · TAX-MID · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1326370123
- ENUM-MID 2010
- TAX-MID 37K Surgery Physician
- RX-TRACE 20
- BOOK-THIN 142 in Montana
- PHOTO-ENUM Jessica Gielow · 2010
William McGregor, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
20 ≥ 0th percentile 0% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
◑
Board-eligible specialty (heuristic, not verified)
William McGregor, M.D. 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 William McGregor, M.D.?
Quality data not reportedPrimary specialty
Surgery Physician
Medicare Part D claims
20 89% vs specialty avg
Specialty distribution in Montana
How Surgery Physician compares to other specialties among Montana providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Surgery Physician. Verify directly:
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
Provider Details
| NPI | 1326370123 |
|---|---|
| Specialty | Surgery Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 02/03/2010 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
20
Total Claims
$489
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 56
- Total Day Supply
- 1,680
- Brand Drug Cost
- $0
- Generic Drug Cost
- $489
Patient Demographics
- Average Patient Age
- 84.0 years
- Avg HCC Risk Score
- 0.48
Surgery Physician Overview
How William McGregor, M.D. fits within the Surgery Physician landscape nationally.
36,778
Surgery Physician Providers in US
56
States with Surgery Physician
174
Avg Claims per Provider
William McGregor, M.D.'s 20 claims are below the specialty average of 174.
Nationwide Surgery Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for McGregor, both outside Montana so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2010)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Surgery Physician Providers in Montana
Other clinicians with the same primary specialty enrolled in Montana, drawn from the same CMS NPPES roster as McGregor.
One of 142 Surgery Physician providers enrolled in Montana, 5 are shown here.
Dr. Alissa Abentroth
MD
Helena, MT
Dr. Kurt Ammerman
D.O.
Miles City, MT
Dr. Ryan Bachofer
MD
Missoula, MT
Dr. Jeffrey Balison
M.D.
Billings, MT
Dr. Kelly Banks
MD
Bozeman, MT
Compare Surgery Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William McGregor, M.D.'s specialty? ▼
William McGregor, M.D. specializes in Surgery Physician and practices in Great Falls, Montana. Credentials: M.D..
How much does William McGregor, M.D. prescribe under Medicare Part D? ▼
In 2024, William McGregor, M.D. wrote 20 Medicare Part D claims totaling $489 in drug costs for N/A beneficiaries.
Where is William McGregor, M.D. located? ▼
William McGregor, M.D. is located at 520 34TH ST S, Great Falls, MT, 59405. Phone: (406) 727-4070.
What is William McGregor, M.D.'s NPI number? ▼
William McGregor, M.D.'s National Provider Identifier (NPI) is 1326370123, issued on 02/03/2010.
How many Surgery Physician providers are there in the US? ▼
There are 36,778 Surgery Physician providers across 56 states in the US. The average Surgery Physician provider writes 174 Medicare Part D claims per year.
Does William McGregor, M.D. accept Medicare? ▼
William McGregor, M.D. appears in CMS Medicare data with 20 Part D claims and N/A Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William McGregor, M.D.'s credentials? ▼
William McGregor, M.D.'s NPI is 1326370123 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.
- 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
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.