NPI registry status
Active
2026 NPPES data Pulmonary Disease Physician NPI 1548209646 M.D.
Verify on CMS → Hsien-Wen Hsu, M.D.
Pulmonary Disease Physician in Pittsburg, 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 9,323 in Pulmonary Disease 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
3K
Medicare Part D claims · 422 beneficiaries · Pulmonary Disease Physician avg: 1K
Generic prescribing
44%
generic claims · 55% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$694.37
6 payments · CMS Open Payments (Sunshine Act)
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
Hsien-Wen Hsu, M.D. filed 2,765 Medicare Part D claims in 2023 as a Pulmonary Disease Physician in Pittsburg, California, prescribing 44% generic.
- 3K
- Part D claims, 2023
- 44%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Hsien-Wen Hsu, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,765 Top 12% higher than 88% 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 certification likely (heuristic, not verified)
Hsien-Wen Hsu, 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 Hsien-Wen Hsu, M.D.?
Quality data not reportedPrimary specialty
Pulmonary Disease Physician
Medicare Part D claims
2,765 90% vs specialty avg
Specialty distribution in California
How Pulmonary Disease 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 Pulmonary Disease 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).
Hsien-Wen Hsu, M.D. appears in the CMS NPPES registry as a Pulmonary Disease Physician provider holding M.D. credentials at 2220 GLADSTONE DR, Pittsburg, CA, 94565, with a listed phone of (925) 432-3318. NPI 1548209646 was issued on 06/05/2006.
Medicare Part D records for calendar year 2023 show 2,765 prescription claims written by this provider, covering 422 Medicare beneficiaries and totaling roughly $1.4 million in drug spend, split 55% brand-name and 44% generic by claim count, with an opioid prescribing rate of 0.7%.
Pulmonary Disease Physician is a mid-sized specialty nationwide, with 9,323 enrolled providers across 53 states and an average of 1,457 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 | 1548209646 |
|---|---|
| Specialty | Pulmonary Disease Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/05/2006 |
Hospital and facility affiliations
Facilities where Hsien-Wen Hsu, 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.
Pittsburg-Antioch Medical Group A Professional Corporation
Pittsburg, CA
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 Hsien-Wen Hsu, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$694
Largest payer
AstraZeneca Pharmaceuticals LP
Most common payment type
Food and Beverage
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 - 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 Hsien-Wen Hsu, M.D.. To verify Hsien-Wen Hsu, M.D.'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 · Brand-heavy
Hsien-Wen Hsu, M.D. - brand share 55.0%
Pulmonary Disease Physician average
55% brand-name claims vs 44% generic, on 2,765 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.
2,765
Total Claims
$1.4M
Total Drug Cost
422
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,287
- Total Day Supply
- 120,455
- Brand vs Generic
- 55% brand / 44% generic
- Brand Drug Cost
- $1.3M
- Generic Drug Cost
- $83K
- Opioid Claims
- 19 (0.7% rate)
- Antibiotic Claims
- 277
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 2.18
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 53, 65-74: 139, 75-84: 167, 85+: 63
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Hsien-Wen Hsu, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Trelegy Ellipta
Trelegy Ellipta
344 claims
- Symbicort
Symbicort
218 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
216 claims
- Azithromycin
Azithromycin
176 claims
- Breztri Aerosphere
Breztri Aerosphere
162 claims
- Prednisone
Prednisone
151 claims
- Roflumilast 129
Roflumilast
129 claims
- Ventolin Hfa 95
Ventolin Hfa
95 claims
| Drug | Claims |
|---|---|
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 344 |
| Symbicort Budesonide/Formoterol Fumarate | 218 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 216 |
| Azithromycin | 176 |
| Breztri Aerosphere Budesonide/Glycopyr/Formoterol | 162 |
| Prednisone | 151 |
| Roflumilast | 129 |
| Ventolin Hfa Albuterol Sulfate | 95 |
| Breo Ellipta Fluticasone/Vilanterol | 92 |
| Spiriva Respimat Tiotropium Bromide | 87 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Pulmonary Disease Physician Overview
How Hsien-Wen Hsu, M.D. fits within the Pulmonary Disease Physician landscape nationally.
9,323
Pulmonary Disease Physician Providers in US
53
States with Pulmonary Disease Physician
1,457
Avg Claims per Provider
Hsien-Wen Hsu, M.D.'s 2,765 claims are above the specialty average of 1,457.
Nearby Pulmonary Disease Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Hsu.
Dr. Manoochehr Abadian Sharifabad
M.D.
Fountain Valley, CA
Dr. Mohamad Abdelfattah
MD
Fullerton, CA
Dr. Zainab Abdulsada
MBCHB
Sacramento, CA
Dr. Ayham Aboeed
M.D.
Bakersfield, CA
Dr. Babak Abrishami
D.O.
Los Angeles, CA
Compare Pulmonary Disease 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 Pulmonary Disease 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
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore California
Frequently Asked Questions
What is Hsien-Wen Hsu, M.D.'s specialty? ▼
Hsien-Wen Hsu, M.D. specializes in Pulmonary Disease Physician and practices in Pittsburg, California. Credentials: M.D..
How much does Hsien-Wen Hsu, M.D. prescribe under Medicare Part D? ▼
In 2023, Hsien-Wen Hsu, M.D. wrote 2,765 Medicare Part D claims totaling $1.4M in drug costs for 422 beneficiaries.
Where is Hsien-Wen Hsu, M.D. located? ▼
Hsien-Wen Hsu, M.D. is located at 2220 GLADSTONE DR, Pittsburg, CA, 94565. Phone: (925) 432-3318.
What is Hsien-Wen Hsu, M.D.'s NPI number? ▼
Hsien-Wen Hsu, M.D.'s National Provider Identifier (NPI) is 1548209646, issued on 06/05/2006.
Does Hsien-Wen Hsu, M.D. prescribe more brand-name or generic drugs? ▼
Hsien-Wen Hsu, M.D.'s prescribing is 55% brand-name and 44% generic drugs by claim count, with $1.3M in brand drug costs.
Does Hsien-Wen Hsu, M.D. prescribe opioids? ▼
Yes, Hsien-Wen Hsu, M.D. had 19 opioid claims in 2023 with an opioid prescribing rate of 0.7%.
How many Pulmonary Disease Physician providers are there in the US? ▼
There are 9,323 Pulmonary Disease Physician providers across 53 states in the US. The average Pulmonary Disease Physician provider writes 1,457 Medicare Part D claims per year.
What drugs does Hsien-Wen Hsu, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Hsien-Wen Hsu, M.D.'s most frequently prescribed drugs include Trelegy Ellipta, Symbicort, Albuterol Sulfate Hfa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Hsien-Wen Hsu, M.D. accept Medicare? ▼
Hsien-Wen Hsu, M.D. appears in CMS Medicare data with 2,765 Part D claims and 422 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Hsien-Wen Hsu, M.D.'s credentials? ▼
Hsien-Wen Hsu, M.D.'s NPI is 1548209646 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 (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.