NPI registry status
Active
2026 NPPES data Neurology Physician NPI 1851466593 M.D.
Verify on CMS → Gregory Barkley, M.D.
Neurology Physician in Detroit, 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
7K
Medicare Part D claims · 363 beneficiaries · Neurology Physician avg: 1K
Generic prescribing
83%
generic claims · 16% 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
Gregory Barkley, M.D. filed 6,618 Medicare Part D claims in 2024 as a Neurology Physician in Detroit, Michigan, prescribing 83% generic.
- 7K
- Part D claims, 2024
- 83%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥96th
- 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 Gregory Barkley, 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 1851466593), first enumerated 11/21/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 6,618 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
1 CMS Care Compare hospital affiliation 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 Gregory Barkley, M.D.'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 1851466593 · Neurology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1851466593
- ENUM-LEGACY 2006
- TAX-MID 20K Neurology Physician
- RX-MID 6,618
- BOOK-LIGHT 678 in Michigan
- PHOTO-ENUM Bryan Philbrook · 2006
Gregory Barkley, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
6,618 ≥ 96th percentile 96% 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)
Gregory Barkley, M.D. 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).
What does the federal data show about Gregory Barkley, M.D.?
Quality data not reportedPrimary specialty
Neurology Physician
Medicare Part D claims
6,618 388% 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 | 1851466593 |
|---|---|
| Specialty | Neurology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 11/21/2006 |
Hospital and facility affiliations
Facilities where Gregory Barkley, M.D. 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.
Henry Ford Health System
Detroit, 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 Gregory Barkley, M.D.. To verify Gregory Barkley, M.D.'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
Gregory Barkley, M.D. - brand share 16.0%
Neurology Physician average
16% brand-name claims vs 83% generic, on 6,618 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.
6,618
Total Claims
$3.5M
Total Drug Cost
363
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 9,804.233
- Total Day Supply
- 284,381
- Brand vs Generic
- 16% brand / 83% generic
- Brand Drug Cost
- $3.1M
- Generic Drug Cost
- $324K
- Opioid Claims
- 420 (6.3% rate)
Patient Demographics
- Average Patient Age
- 57.6 years
- Avg HCC Risk Score
- 1.31
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 223, 65-74: 94, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Gregory Barkley, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Lamotrigine
Lamotrigine
706 claims
- Clonazepam
Clonazepam
563 claims
- Epidiolex
Epidiolex
486 claims
- Levetiracetam
Levetiracetam
328 claims
- Lacosamide 254
Lacosamide
254 claims
- Lorazepam 248
Lorazepam
248 claims
- Hydrocodone-Acetam… 191
Hydrocodone-Acetaminophen
191 claims
- Topiramate 169
Topiramate
169 claims
| Drug | Claims |
|---|---|
| Lamotrigine | 706 |
| Clonazepam | 563 |
| Epidiolex Cannabidiol (Cbd) | 486 |
| Levetiracetam | 328 |
| Lacosamide | 254 |
| Lorazepam | 248 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 191 |
| Topiramate | 169 |
| Gabapentin | 143 |
| Zonisamide | 139 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurology Physician Overview
How Gregory Barkley, M.D. 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
Gregory Barkley, M.D.'s 6,618 claims are above the specialty average of 1,356.
Nationwide Neurology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Barkley, both outside Michigan 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 Neurology Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Barkley.
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 Gregory Barkley, M.D.'s specialty? ▼
Gregory Barkley, M.D. specializes in Neurology Physician and practices in Detroit, Michigan. Credentials: M.D..
How much does Gregory Barkley, M.D. prescribe under Medicare Part D? ▼
In 2024, Gregory Barkley, M.D. wrote 6,618 Medicare Part D claims totaling $3.5M in drug costs for 363 beneficiaries.
Where is Gregory Barkley, M.D. located? ▼
Gregory Barkley, M.D. is located at 2799 W GRAND BLVD, Detroit, MI, 48202. Phone: (313) 916-2600.
What is Gregory Barkley, M.D.'s NPI number? ▼
Gregory Barkley, M.D.'s National Provider Identifier (NPI) is 1851466593, issued on 11/21/2006.
Does Gregory Barkley, M.D. prescribe more brand-name or generic drugs? ▼
Gregory Barkley, M.D.'s prescribing is 16% brand-name and 83% generic drugs by claim count, with $3.1M in brand drug costs.
Does Gregory Barkley, M.D. prescribe opioids? ▼
Yes, Gregory Barkley, M.D. had 420 opioid claims in 2024 with an opioid prescribing rate of 6.3%.
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 Gregory Barkley, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Gregory Barkley, M.D.'s most frequently prescribed drugs include Lamotrigine, Clonazepam, Epidiolex. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Barkley, M.D. accept Medicare? ▼
Gregory Barkley, M.D. appears in CMS Medicare data with 6,618 Part D claims and 363 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Barkley, M.D.'s credentials? ▼
Gregory Barkley, M.D.'s NPI is 1851466593 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.