NPI registry status
Active
2026 NPPES data Neurology Physician NPI 1992794481 MD
Verify on CMS → William Stacey, MD
Neurology Physician in Ann Arbor, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 20,467 in Neurology 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
350
Medicare Part D claims · 32 beneficiaries · Neurology Physician avg: 1K
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
William Stacey, MD filed 350 Medicare Part D claims in 2024 as a Neurology Physician in Ann Arbor, Michigan, prescribing 90% generic.
- 350
- Part D claims, 2024
- 90%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥56th
- 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 Stacey, 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 1992794481), first enumerated 10/18/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 350 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
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Michigan statewide board action statistics are published annually — these figures describe aggregate state activity, not William Stacey, MD's individual license status. Verify directly with the state medical board.
Source: MI-BOM annual report 2023
- 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 1992794481 · Neurology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1992794481
- ENUM-LEGACY 2005
- TAX-MID 20K Neurology Physician
- RX-LIGHT 350
- BOOK-LIGHT 678 in Michigan
- PHOTO-ENUM Mark Alberts · 2005
William Stacey, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
350 ≥ 56th percentile 56% 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 certification likely (heuristic, not verified)
William Stacey, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Stacey, MD?
Quality data not reportedPrimary specialty
Neurology Physician
Medicare Part D claims
350 74% vs specialty avg
Specialty distribution in Michigan
How Neurology Physician compares to other specialties among Michigan 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 Neurology 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 | 1992794481 |
|---|---|
| Specialty | Neurology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/18/2005 |
Hospital and facility affiliations
Facilities where William Stacey, 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.
Metropolitan Hospital
Wyoming, MI
Regents OF The University OF Michigan
Ann Arbor, MI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Michigan MI-BOM 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 ~41K Michigan medical licensees in 2023 - they are NOT specific to William Stacey, MD. To verify William Stacey, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM 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 Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
William Stacey, MD - brand share 10.0%
Neurology Physician average
10% brand-name claims vs 90% generic, on 350 2024 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 2024.
350
Total Claims
$83K
Total Drug Cost
32
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 523.933
- Total Day Supply
- 14,918
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $55K
- Generic Drug Cost
- $28K
Patient Demographics
- Average Patient Age
- 55.1 years
- Avg HCC Risk Score
- 1.10
- Gender Split
- 38% female / 63% male
- Age Distribution
- <65: 21, 65-74: N/A, 75-84: N/A, 85+: 0
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What William Stacey, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Levetiracetam
Levetiracetam
49 claims
- Lamotrigine
Lamotrigine
44 claims
- Divalproex Sodium
Divalproex Sodium
42 claims
- Lacosamide
Lacosamide
36 claims
- Zonisamide
Zonisamide
32 claims
- Xcopri
Xcopri
20 claims
- Oxcarbazepine 19
Oxcarbazepine
19 claims
- Clobazam 13
Clobazam
13 claims
| Drug | Claims |
|---|---|
| Levetiracetam | 49 |
| Lamotrigine | 44 |
| Divalproex Sodium | 42 |
| Lacosamide | 36 |
| Zonisamide | 32 |
| Xcopri Cenobamate | 20 |
| Oxcarbazepine | 19 |
| Clobazam | 13 |
| Divalproex Sodium Er Divalproex Sodium | 13 |
| Clonazepam | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurology Physician Overview
How William Stacey, MD fits within the Neurology Physician landscape nationally.
20,467
Neurology Physician Providers in US
54
States with Neurology Physician
1,356
Avg Claims per Provider
William Stacey, MD's 350 claims are below the specialty average of 1,356.
Nationwide Neurology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Stacey, both outside Michigan so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Neurology Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Stacey.
One of 678 Neurology Physician providers enrolled in Michigan, 5 are shown here.
Dr. Shan Abbas
M.D.
Grand Rapids, MI
Dr. Faith Abbott
DO
Saginaw, MI
Diana Abdalhk
Grand Rapids, MI
Dr. Esam Abobaker
DO
Grand Rapids, MI
Dr. Andrea Abousamra
DO
Clinton Township, MI
Compare Neurology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Stacey, MD's specialty? ▼
William Stacey, MD specializes in Neurology Physician and practices in Ann Arbor, Michigan. Credentials: MD.
How much does William Stacey, MD prescribe under Medicare Part D? ▼
In 2024, William Stacey, MD wrote 350 Medicare Part D claims totaling $83K in drug costs for 32 beneficiaries.
Where is William Stacey, MD located? ▼
William Stacey, MD is located at 1500 E MEDICAL CENTER DR, Ann Arbor, MI, 48109. Phone: (734) 936-9010.
What is William Stacey, MD's NPI number? ▼
William Stacey, MD's National Provider Identifier (NPI) is 1992794481, issued on 10/18/2005.
Does William Stacey, MD prescribe more brand-name or generic drugs? ▼
William Stacey, MD's prescribing is 10% brand-name and 90% generic drugs by claim count, with $55K in brand drug costs.
How many Neurology Physician providers are there in the US? ▼
There are 20,467 Neurology Physician providers across 54 states in the US. The average Neurology Physician provider writes 1,356 Medicare Part D claims per year.
What drugs does William Stacey, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, William Stacey, MD's most frequently prescribed drugs include Levetiracetam, Lamotrigine, Divalproex Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Stacey, MD accept Medicare? ▼
William Stacey, MD appears in CMS Medicare data with 350 Part D claims and 32 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Stacey, MD's credentials? ▼
William Stacey, MD's NPI is 1992794481 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.