NPI registry status
Active
2026 NPPES data Psychiatry Physician NPI 1174555437 MD
Verify on CMS → John Corwin, MD
Psychiatry Physician in Madison, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 53,171 in Psychiatry 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
194
Medicare Part D claims · 23 beneficiaries · Psychiatry Physician avg: 1K
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
John Corwin, MD filed 194 Medicare Part D claims in 2023 as a Psychiatry Physician in Madison, Connecticut, prescribing 93% generic.
- 194
- Part D claims, 2023
- 93%
- generic prescribing
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.
John Corwin, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
194 35th percentile higher than 35% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
John Corwin, 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 John Corwin, MD?
Quality data not reportedPrimary specialty
Psychiatry Physician
Medicare Part D claims
194 81% vs specialty avg
Specialty distribution in Connecticut
How Psychiatry Physician compares to other specialties among Connecticut 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 Psychiatry 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).
John Corwin, MD appears in the CMS NPPES registry as a Psychiatry Physician provider holding MD credentials at 17 WOODLAND RD, Madison, CT, 06443, with a listed phone of (203) 245-3929. NPI 1174555437 was issued on 07/07/2006.
Medicare Part D records for calendar year 2023 show 194 prescription claims written by this provider, covering 23 Medicare beneficiaries and totaling roughly $12K in drug spend, split 7% brand-name and 93% generic by claim count.
Psychiatry Physician is a high-volume specialty nationwide, with 53,171 enrolled providers across 56 states and an average of 1,038 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1174555437 |
|---|---|
| Specialty | Psychiatry Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/07/2006 |
Brand vs generic prescribing mix · Generic-heavy
John Corwin, MD - brand share 7.0%
Psychiatry Physician average
7% brand-name claims vs 93% generic, on 194 2023 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 2023.
194
Total Claims
$12K
Total Drug Cost
23
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 497
- Total Day Supply
- 14,806
- Brand vs Generic
- 7% brand / 93% generic
- Brand Drug Cost
- $114
- Generic Drug Cost
- $12K
Patient Demographics
- Average Patient Age
- 74.0 years
- Avg HCC Risk Score
- 1.13
- Gender Split
- 52% female / 48% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Corwin, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Lamotrigine
Lamotrigine
39 claims
- Quetiapine Fumarate
Quetiapine Fumarate
16 claims
- Lithium Carbonate 15
Lithium Carbonate
15 claims
- Bupropion Xl 13
Bupropion Xl
13 claims
- Gabapentin 11
Gabapentin
11 claims
| Drug | Claims |
|---|---|
| Lamotrigine | 39 |
| Quetiapine Fumarate | 16 |
| Lithium Carbonate | 15 |
| Bupropion Xl Bupropion Hcl | 13 |
| Gabapentin | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Psychiatry Physician Overview
How John Corwin, MD fits within the Psychiatry Physician landscape nationally.
53,171
Psychiatry Physician Providers in US
56
States with Psychiatry Physician
1,038
Avg Claims per Provider
John Corwin, MD's 194 claims are below the specialty average of 1,038.
Nearby Psychiatry Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Corwin.
Dr. Enenge A'Bodjedi
MD
Stamford, CT
Dr. Chadi Abdallah
M.D.
West Haven, CT
Sarah Abdallah
New Haven, CT
Elie Abdelnour
New Haven, CT
Dr. Nora Abdullah
MD
New Haven, CT
Compare Psychiatry Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychiatry Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
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How insurance networks affect your costs
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Explore Connecticut
Frequently Asked Questions
What is John Corwin, MD's specialty? ▼
John Corwin, MD specializes in Psychiatry Physician and practices in Madison, Connecticut. Credentials: MD.
How much does John Corwin, MD prescribe under Medicare Part D? ▼
In 2023, John Corwin, MD wrote 194 Medicare Part D claims totaling $12K in drug costs for 23 beneficiaries.
Where is John Corwin, MD located? ▼
John Corwin, MD is located at 17 WOODLAND RD, Madison, CT, 06443. Phone: (203) 245-3929.
What is John Corwin, MD's NPI number? ▼
John Corwin, MD's National Provider Identifier (NPI) is 1174555437, issued on 07/07/2006.
Does John Corwin, MD prescribe more brand-name or generic drugs? ▼
John Corwin, MD's prescribing is 7% brand-name and 93% generic drugs by claim count, with $114 in brand drug costs.
How many Psychiatry Physician providers are there in the US? ▼
There are 53,171 Psychiatry Physician providers across 56 states in the US. The average Psychiatry Physician provider writes 1,038 Medicare Part D claims per year.
What drugs does John Corwin, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, John Corwin, MD's most frequently prescribed drugs include Lamotrigine, Quetiapine Fumarate, Lithium Carbonate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Corwin, MD accept Medicare? ▼
John Corwin, MD appears in CMS Medicare data with 194 Part D claims and 23 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Corwin, MD's credentials? ▼
John Corwin, MD's NPI is 1174555437 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.