NPI registry status
Active
2026 NPPES data Psychosomatic Medicine Physician NPI 1275741969 MD
Verify on CMS → Mai Phuong Nguyen, MD
Psychosomatic Medicine Physician in Truckee, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 492 in Psychosomatic 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 · 52 beneficiaries · Psychosomatic Medicine Physician avg: 645
Generic prescribing
94%
generic claims · 6% 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
Mai Phuong Nguyen, MD filed 1,869 Medicare Part D claims in 2023 as a Psychosomatic Medicine Physician in Truckee, California, prescribing 94% generic.
- 2K
- Part D claims, 2023
- 94%
- 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.
Mai Phuong Nguyen, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,869 Top 17% higher than 83% 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)
Mai Phuong Nguyen, 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 Mai Phuong Nguyen, MD?
Quality data not reportedPrimary specialty
Psychosomatic Medicine Physician
Medicare Part D claims
1,869 190% vs specialty avg
Specialty distribution in California
How Psychosomatic Medicine Physician compares to other specialties among California 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 Psychosomatic 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).
Mai Phuong Nguyen, MD appears in the CMS NPPES registry as a Psychosomatic Medicine Physician provider holding MD credentials at 10356 DONNER PASS ROAD, Truckee, CA, 96162, with a listed phone of (530) 587-5877. NPI 1275741969 was issued on 05/18/2007.
Medicare Part D records for calendar year 2023 show 1,869 prescription claims written by this provider, covering 52 Medicare beneficiaries and totaling roughly $396K in drug spend, split 6% brand-name and 94% generic by claim count.
Psychosomatic Medicine Physician is a narrow specialty nationwide, with 492 enrolled providers across 43 states and an average of 645 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 | 1275741969 |
|---|---|
| Specialty | Psychosomatic Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 05/18/2007 |
License & disciplinary context - California MBC 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 ~150K California medical licensees in 2023 - they are NOT specific to Mai Phuong Nguyen, MD. To verify Mai Phuong Nguyen, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC 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 California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Generic-heavy
Mai Phuong Nguyen, MD - brand share 6.0%
Psychosomatic Medicine Physician average
6% brand-name claims vs 94% generic, on 1,869 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.
1,869
Total Claims
$396K
Total Drug Cost
52
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,900
- Total Day Supply
- 40,553
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $322K
- Generic Drug Cost
- $74K
Patient Demographics
- Average Patient Age
- 52.8 years
- Avg HCC Risk Score
- 1.24
- Gender Split
- 38% female / 62% male
- Age Distribution
- <65: 34, 65-74: 17, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mai Phuong Nguyen, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Clozapine
Clozapine
412 claims
- Olanzapine
Olanzapine
199 claims
- Escitalopram Oxalate 105
Escitalopram Oxalate
105 claims
- Divalproex Sodium Er 87
Divalproex Sodium Er
87 claims
- Quetiapine Fumarate 86
Quetiapine Fumarate
86 claims
- Risperidone 79
Risperidone
79 claims
- Benztropine Mesylate 78
Benztropine Mesylate
78 claims
- Levothyroxine Sodium 69
Levothyroxine Sodium
69 claims
| Drug | Claims |
|---|---|
| Clozapine | 412 |
| Olanzapine | 199 |
| Escitalopram Oxalate | 105 |
| Divalproex Sodium Er Divalproex Sodium | 87 |
| Quetiapine Fumarate | 86 |
| Risperidone | 79 |
| Benztropine Mesylate | 78 |
| Levothyroxine Sodium | 69 |
| Lithium Carbonate | 68 |
| Buspirone Hcl | 59 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Psychosomatic Medicine Physician Overview
How Mai Phuong Nguyen, MD fits within the Psychosomatic Medicine Physician landscape nationally.
492
Psychosomatic Medicine Physician Providers in US
43
States with Psychosomatic Medicine Physician
645
Avg Claims per Provider
Mai Phuong Nguyen, MD's 1,869 claims are above the specialty average of 645.
Nearby Psychosomatic Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.
Dr. Andrew Abarbanel
M.D.
Soquel, CA
Dr. Julia Adler
MD
San Francisco, CA
Dr. Carl-Erik Andersen
M.D.
Merced, CA
Dr. Susan Andrews
M.D.
Sacramento, CA
Dr. Carol Banyas
MD
Danville, CA
Compare Psychosomatic Medicine 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 California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychosomatic Medicine 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.
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Frequently Asked Questions
What is Mai Phuong Nguyen, MD's specialty? ▼
Mai Phuong Nguyen, MD specializes in Psychosomatic Medicine Physician and practices in Truckee, California. Credentials: MD.
How much does Mai Phuong Nguyen, MD prescribe under Medicare Part D? ▼
In 2023, Mai Phuong Nguyen, MD wrote 1,869 Medicare Part D claims totaling $396K in drug costs for 52 beneficiaries.
Where is Mai Phuong Nguyen, MD located? ▼
Mai Phuong Nguyen, MD is located at 10356 DONNER PASS ROAD, Truckee, CA, 96162. Phone: (530) 587-5877.
What is Mai Phuong Nguyen, MD's NPI number? ▼
Mai Phuong Nguyen, MD's National Provider Identifier (NPI) is 1275741969, issued on 05/18/2007.
Does Mai Phuong Nguyen, MD prescribe more brand-name or generic drugs? ▼
Mai Phuong Nguyen, MD's prescribing is 6% brand-name and 94% generic drugs by claim count, with $322K in brand drug costs.
How many Psychosomatic Medicine Physician providers are there in the US? ▼
There are 492 Psychosomatic Medicine Physician providers across 43 states in the US. The average Psychosomatic Medicine Physician provider writes 645 Medicare Part D claims per year.
What drugs does Mai Phuong Nguyen, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mai Phuong Nguyen, MD's most frequently prescribed drugs include Clozapine, Olanzapine, Escitalopram Oxalate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mai Phuong Nguyen, MD accept Medicare? ▼
Mai Phuong Nguyen, MD appears in CMS Medicare data with 1,869 Part D claims and 52 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mai Phuong Nguyen, MD's credentials? ▼
Mai Phuong Nguyen, MD's NPI is 1275741969 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.