NPI registry status
Active
2026 NPPES data Sleep Medicine (Internal Medicine) Physician NPI 1619950045 PHD/MD
Verify on CMS → John Winkelman, PHD/MD
Sleep Medicine (Internal Medicine) Physician in Boston, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 932 in Sleep Medicine (Internal 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
2K
Medicare Part D claims · 266 beneficiaries · Sleep Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
94%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$37.5K
6 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
John Winkelman, PHD/MD filed 2,213 Medicare Part D claims in 2024 as a Sleep Medicine (Internal Medicine) Physician in Boston, Massachusetts, prescribing 94% generic.
- 2K
- Part D claims, 2024
- 94%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥85th
- 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 John Winkelman, PHD/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 1619950045), first enumerated 11/21/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,213 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
- Reported
Industry payment transparency
$37.5K in reported industry payments (6 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Massachusetts statewide board action statistics are published annually — these figures describe aggregate state activity, not John Winkelman, PHD/MD's individual license status. Verify directly with the state medical board.
Source: BORIM 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 1619950045 · Sleep Medicine (Internal Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1619950045
- ENUM-LEGACY 2005
- TAX-NARROW 932
- RX-MID 2,213
- BOOK-THIN 17 in Massachusetts
- PHOTO-ENUM Lo'Ay Al-Asadi, MD · 2005
John Winkelman, PHD/MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
2,213 ≥ 85th percentile 85% 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)
John Winkelman, PHD/MD 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 John Winkelman, PHD/MD?
Quality data not reportedPrimary specialty
Sleep Medicine (Internal Medicine) Physician
Medicare Part D claims
2,213 72% vs specialty avg
Specialty distribution in Massachusetts
How Sleep Medicine (Internal Medicine) Physician compares to other specialties among Massachusetts 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 Sleep Medicine (Internal 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 | 1619950045 |
|---|---|
| Specialty | Sleep Medicine (Internal Medicine) Physician |
| Credentials | PHD/MD |
| Gender | Male |
| NPI Issued | 11/21/2005 |
Hospital and facility affiliations
Facilities where John Winkelman, PHD/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.
Massachusetts General Physicians Organization Inc
Boston, MA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for John Winkelman, PHD/MD. Source: openpaymentsdata.cms.gov.
Total received
$37.5K
Largest payer
Azurity Pharmaceuticals, Inc.
Most common payment type
Consulting Fee
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Massachusetts BORIM 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 ~38K Massachusetts medical licensees in 2023 - they are NOT specific to John Winkelman, PHD/MD. To verify John Winkelman, PHD/MD's current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM 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 Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Generic-heavy
John Winkelman, PHD/MD - brand share 6.0%
Sleep Medicine (Internal Medicine) Physician average
6% brand-name claims vs 94% generic, on 2,213 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.
2,213
Total Claims
$546K
Total Drug Cost
266
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,259
- Total Day Supply
- 94,994
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $470K
- Generic Drug Cost
- $76K
- Opioid Claims
- 610 (27.6% rate)
Patient Demographics
- Average Patient Age
- 73.1 years
- Avg HCC Risk Score
- 1.18
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 27, 65-74: 101, 75-84: 117, 85+: 21
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What John Winkelman, PHD/MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Methadone Hcl
Methadone Hcl
474 claims
- Pregabalin
Pregabalin
380 claims
- Gabapentin
Gabapentin
275 claims
- Pramipexole Dihydr… 182
Pramipexole Dihydrochloride
182 claims
- Trazodone Hcl 80
Trazodone Hcl
80 claims
- Ropinirole Hcl 65
Ropinirole Hcl
65 claims
- Lorazepam 60
Lorazepam
60 claims
- Oxycodone Hcl 58
Oxycodone Hcl
58 claims
| Drug | Claims |
|---|---|
| Methadone Hcl | 474 |
| Pregabalin | 380 |
| Gabapentin | 275 |
| Pramipexole Dihydrochloride Pramipexole Di-Hcl | 182 |
| Trazodone Hcl | 80 |
| Ropinirole Hcl | 65 |
| Lorazepam | 60 |
| Oxycodone Hcl | 58 |
| Modafinil | 44 |
| Zolpidem Tartrate | 41 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Sleep Medicine (Internal Medicine) Physician in MA →
All providers in Massachusetts →
Compare specialties →
Sleep Medicine (Internal Medicine) Physician Overview
How John Winkelman, PHD/MD fits within the Sleep Medicine (Internal Medicine) Physician landscape nationally.
932
Sleep Medicine (Internal Medicine) Physician Providers in US
52
States with Sleep Medicine (Internal Medicine) Physician
1,288
Avg Claims per Provider
John Winkelman, PHD/MD's 2,213 claims are above the specialty average of 1,288.
Nationwide Sleep Medicine (Internal Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Winkelman, both outside Massachusetts 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 Sleep Medicine (Internal Medicine) Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Winkelman.
One of 17 Sleep Medicine (Internal Medicine) Physician providers enrolled in Massachusetts, 5 are shown here.
Dr. Essam Ansari
M.D.
Methuen, MA
Dr. Mushtaque Chachar
MD
New Bedford, MA
Dr. Susan Chang
MD
Boston, MA
Dr. Steven Davis
M.D.
Worcester, MA
Dr. Chloe Deng
D.O.
Auburn, MA
Compare Sleep Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is John Winkelman, PHD/MD's specialty? ▼
John Winkelman, PHD/MD specializes in Sleep Medicine (Internal Medicine) Physician and practices in Boston, Massachusetts. Credentials: PHD/MD.
How much does John Winkelman, PHD/MD prescribe under Medicare Part D? ▼
In 2024, John Winkelman, PHD/MD wrote 2,213 Medicare Part D claims totaling $546K in drug costs for 266 beneficiaries.
Where is John Winkelman, PHD/MD located? ▼
John Winkelman, PHD/MD is located at 55 FRUIT ST, Boston, MA, 02114. Phone: (617) 724-7426.
What is John Winkelman, PHD/MD's NPI number? ▼
John Winkelman, PHD/MD's National Provider Identifier (NPI) is 1619950045, issued on 11/21/2005.
Does John Winkelman, PHD/MD prescribe more brand-name or generic drugs? ▼
John Winkelman, PHD/MD's prescribing is 6% brand-name and 94% generic drugs by claim count, with $470K in brand drug costs.
Does John Winkelman, PHD/MD prescribe opioids? ▼
Yes, John Winkelman, PHD/MD had 610 opioid claims in 2024 with an opioid prescribing rate of 27.6%.
How many Sleep Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 932 Sleep Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Sleep Medicine (Internal Medicine) Physician provider writes 1,288 Medicare Part D claims per year.
What drugs does John Winkelman, PHD/MD prescribe most often? ▼
Based on 2024 Medicare Part D data, John Winkelman, PHD/MD's most frequently prescribed drugs include Methadone Hcl, Pregabalin, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Winkelman, PHD/MD accept Medicare? ▼
John Winkelman, PHD/MD appears in CMS Medicare data with 2,213 Part D claims and 266 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Winkelman, PHD/MD's credentials? ▼
John Winkelman, PHD/MD's NPI is 1619950045 with credentials PHD/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.