NPI registry status
Active
2026 NPPES data Physician Assistant NPI 1619328291 PA-C
Verify on CMS → Margaret Tsai, PA-C
Physician Assistant in City Of Industry, 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 156,084 in Physician Assistant, 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 · 497 beneficiaries · Physician Assistant avg: 832
Industry payments
$1.1K
30 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Margaret Tsai, PA-C filed 2,375 Medicare Part D claims in 2024 as a Physician Assistant in City Of Industry, California.
- 2K
- Part D claims, 2024
- $1.1K
- industry payments (Sunshine Act)
- ≥86th
- 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 Margaret Tsai, PA-C
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 1619328291), first enumerated 06/25/2016.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,375 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Industry payment transparency
$1.1K in reported industry payments (30 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
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Margaret Tsai, PA-C's individual license status. Verify directly with the state medical board.
Source: MBC 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 1619328291 · Physician Assistant
NPI-10 · ENUM-MID · TAX-MEGA · RX-MID · BOOK-MID · PHOTO-ENUM
- NPI-10 1619328291
- ENUM-MID 2016
- TAX-MEGA 156K Physician Assistant
- RX-MID 2,375
- BOOK-MID 13,861 in California
- PHOTO-ENUM Bryan Berlin · 2016
Margaret Tsai, PA-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
2,375 ≥ 86th percentile 86% 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
What does the federal data show about Margaret Tsai, PA-C?
Quality data not reportedPrimary specialty
Physician Assistant
Medicare Part D claims
2,375 185% vs specialty avg
Specialty distribution in California
How Physician Assistant 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 Physician Assistant. 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 | 1619328291 |
|---|---|
| Specialty | Physician Assistant |
| Credentials | PA-C |
| Gender | Female |
| NPI Issued | 06/25/2016 |
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 Margaret Tsai, PA-C. Source: openpaymentsdata.cms.gov.
Total received
$1.1K
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 Margaret Tsai, PA-C. To verify Margaret Tsai, PA-C'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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
2,375
Total Claims
$82K
Total Drug Cost
497
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 5,109.433
- Total Day Supply
- 147,361
- Generic Drug Cost
- $32K
- Antibiotic Claims
- 112
Patient Demographics
- Average Patient Age
- 73.2 years
- Avg HCC Risk Score
- 1.01
- Gender Split
- 62% female / 38% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Margaret Tsai, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
237 claims
- Amlodipine Besylate
Amlodipine Besylate
190 claims
- Omeprazole
Omeprazole
154 claims
- Lorazepam
Lorazepam
120 claims
- Losartan Potassium
Losartan Potassium
108 claims
- Levocetirizine Dih… 81
Levocetirizine Dihydrochloride
81 claims
- Metformin Hcl 65
Metformin Hcl
65 claims
- Azithromycin 63
Azithromycin
63 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 237 |
| Amlodipine Besylate | 190 |
| Omeprazole | 154 |
| Lorazepam | 120 |
| Losartan Potassium | 108 |
| Levocetirizine Dihydrochloride | 81 |
| Metformin Hcl | 65 |
| Azithromycin | 63 |
| Olmesartan Medoxomil | 60 |
| Rosuvastatin Calcium | 53 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Physician Assistant Overview
How Margaret Tsai, PA-C fits within the Physician Assistant landscape nationally.
156,084
Physician Assistant Providers in US
56
States with Physician Assistant
832
Avg Claims per Provider
Margaret Tsai, PA-C's 2,375 claims are above the specialty average of 832.
Nationwide Physician Assistant peers with similar MIPS or enrollment year
Two federal-record peer sets for Tsai, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2016)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Tsai.
One of 13,861 Physician Assistant providers enrolled in California, 5 are shown here.
Marcia -Galbraith
PA
Stockton, CA
Danny Abad
PA
Orange, CA
Lea Dominique Abadies
PA
Tustin, CA
Rea Elizabeth Abaniel
P.A.-C
Seal Beach, CA
Ramina Abbasi
PA-C
Signal Hill, CA
Compare Physician Assistant nationally: see state-by-state distribution →
Frequently Asked Questions
What is Margaret Tsai, PA-C's specialty? ▼
Margaret Tsai, PA-C specializes in Physician Assistant and practices in City Of Industry, California. Credentials: PA-C.
How much does Margaret Tsai, PA-C prescribe under Medicare Part D? ▼
In 2024, Margaret Tsai, PA-C wrote 2,375 Medicare Part D claims totaling $82K in drug costs for 497 beneficiaries.
Where is Margaret Tsai, PA-C located? ▼
Margaret Tsai, PA-C is located at 18575 GALE AVE STE 128, City Of Industry, CA, 91748. Phone: (626) 912-5335.
What is Margaret Tsai, PA-C's NPI number? ▼
Margaret Tsai, PA-C's National Provider Identifier (NPI) is 1619328291, issued on 06/25/2016.
How many Physician Assistant providers are there in the US? ▼
There are 156,084 Physician Assistant providers across 56 states in the US. The average Physician Assistant provider writes 832 Medicare Part D claims per year.
What drugs does Margaret Tsai, PA-C prescribe most often? ▼
Based on 2024 Medicare Part D data, Margaret Tsai, PA-C's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Margaret Tsai, PA-C accept Medicare? ▼
Margaret Tsai, PA-C appears in CMS Medicare data with 2,375 Part D claims and 497 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Margaret Tsai, PA-C's credentials? ▼
Margaret Tsai, PA-C's NPI is 1619328291 with credentials PA-C. 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.