NPI registry status
Active
2026 NPPES data Emergency Medical Services (Emergency Medicine) Physician NPI 1629040118 MD
Verify on CMS → William Dennis, MD
Emergency Medical Services (Emergency Medicine) Physician in Glendale, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,651 in Emergency Medical Services (Emergency Medicine) 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
51
Medicare Part D claims · 36 beneficiaries · Emergency Medical Services (Emergency Medicine) Physician avg: 430
What the federal data shows
William Dennis, MD filed 51 Medicare Part D claims in 2024 as an Emergency Medical Services (Emergency Medicine) Physician in Glendale, Arizona.
- 51
- 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 Dennis, MD
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 1629040118), first enumerated 02/07/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 51 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 1629040118 · Emergency Medical Services (Emergency Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1629040118
- ENUM-LEGACY 2006
- TAX-NARROW 3,651
- RX-TRACE 51
- BOOK-THIN 70 in Arizona
- PHOTO-ENUM Thomas Sorensen · 2006
William Dennis, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
51 ≥ 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 Dennis, 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 William Dennis, MD?
Quality data not reportedPrimary specialty
Emergency Medical Services (Emergency Medicine) Physician
Medicare Part D claims
51 88% vs specialty avg
Specialty distribution in Arizona
How Emergency Medical Services (Emergency Medicine) Physician compares to other specialties among Arizona 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 Emergency Medical Services (Emergency Medicine) 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 | 1629040118 |
|---|---|
| Specialty | Emergency Medical Services (Emergency Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 02/07/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
51
Total Claims
$1K
Total Drug Cost
36
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 52.7
- Total Day Supply
- 496
- Generic Drug Cost
- $385
- Antibiotic Claims
- 26
Patient Demographics
- Average Patient Age
- 70.4 years
- Avg HCC Risk Score
- 2.30
- Gender Split
- 64% female / 36% male
More Emergency Medical Services (Emergency Medicine) Physician in AZ →
All providers in Arizona →
Compare specialties →
Emergency Medical Services (Emergency Medicine) Physician Overview
How William Dennis, MD fits within the Emergency Medical Services (Emergency Medicine) Physician landscape nationally.
3,651
Emergency Medical Services (Emergency Medicine) Physician Providers in US
55
States with Emergency Medical Services (Emergency Medicine) Physician
430
Avg Claims per Provider
William Dennis, MD's 51 claims are below the specialty average of 430.
Nationwide Emergency Medical Services (Emergency Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Dennis, both outside Arizona so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Emergency Medical Services (Emergency Medicine) Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Dennis.
One of 70 Emergency Medical Services (Emergency Medicine) Physician providers enrolled in Arizona, 5 are shown here.
Frequently Asked Questions
What is William Dennis, MD's specialty? ▼
William Dennis, MD specializes in Emergency Medical Services (Emergency Medicine) Physician and practices in Glendale, Arizona. Credentials: MD.
How much does William Dennis, MD prescribe under Medicare Part D? ▼
In 2024, William Dennis, MD wrote 51 Medicare Part D claims totaling $1K in drug costs for 36 beneficiaries.
Where is William Dennis, MD located? ▼
William Dennis, MD is located at 18701 N 67TH AVE, Glendale, AZ, 85308. Phone: (623) 561-1000.
What is William Dennis, MD's NPI number? ▼
William Dennis, MD's National Provider Identifier (NPI) is 1629040118, issued on 02/07/2006.
How many Emergency Medical Services (Emergency Medicine) Physician providers are there in the US? ▼
There are 3,651 Emergency Medical Services (Emergency Medicine) Physician providers across 55 states in the US. The average Emergency Medical Services (Emergency Medicine) Physician provider writes 430 Medicare Part D claims per year.
Does William Dennis, MD accept Medicare? ▼
William Dennis, MD appears in CMS Medicare data with 51 Part D claims and 36 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Dennis, MD's credentials? ▼
William Dennis, MD's NPI is 1629040118 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
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.