NPI registry status
Active
2026 NPPES data Vascular Surgery Physician NPI 1770583056 P.A. - C
Verify on CMS → Stacey Tien, P.A. - C
Vascular Surgery Physician in Orange, 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 4,215 in Vascular Surgery 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
252
Medicare Part D claims · 138 beneficiaries · Vascular Surgery Physician avg: 205
Generic prescribing
75%
generic claims · 25% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
78.1/100
▼ 5 pts below national avg 83.1 · Above neutral
Industry payments
$538.51
13 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
Stacey Tien, P.A. - C reported a CMS MIPS final score of 78.1/100 - below the 83.1 national average - and filed 252 Medicare Part D claims in 2023.
- 78.1/100
- MIPS score · -5 vs avg
- 252
- Part D claims, 2023
- 75%
- 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.
Stacey Tien, P.A. - C's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
78 27th percentile higher than 27% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Stacey Tien, P.A. - C sits
This provider among vascular surgery physician peers
Across the 1,336 vascular surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Stacey Tien, P.A. - C writes more Part D claims than 69% of them and scores higher on MIPS quality than 29% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one vascular surgery physician peer from a representative sample of 60; the gold marker is Stacey Tien, P.A. - C. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Stacey Tien, P.A. - C practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Stacey Tien, P.A. - C?
Near national averagePrimary specialty
Vascular Surgery Physician
Medicare Part D claims
252 23% vs specialty avg
MIPS final score
78.1/100 5 pts vs avg
Specialty distribution in California
How Vascular Surgery Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Stacey Tien, P.A. - C's 2023 MIPS final score plotted against the Vascular Surgery Physician national average
- MIPS Final Score
- 78.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Vascular Surgery Physician) - 78.1/100 vs national avg 83.1
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).
Stacey Tien, P.A. - C appears in the CMS NPPES registry as a Vascular Surgery Physician provider holding P.A. - C credentials at 1140 W LA VETA AVE, Orange, CA, 92868, with a listed phone of (714) 560-4450. NPI 1770583056 was issued on 07/28/2005.
Medicare Part D records for calendar year 2023 show 252 prescription claims written by this provider, covering 138 Medicare beneficiaries and totaling roughly $45K in drug spend, split 25% brand-name and 75% generic by claim count, with an opioid prescribing rate of 25.0%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 78.1/100 for the 2023 performance year (Quality 51.7, Cost 58.7), compared with the national average of 83.1.
Vascular Surgery Physician is a narrow specialty nationwide, with 4,215 enrolled providers across 53 states and an average of 205 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 | 1770583056 |
|---|---|
| Specialty | Vascular Surgery Physician |
| Credentials | P.A. - C |
| Gender | Female |
| NPI Issued | 07/28/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
78.1346
Final Score
Avg: 83.1
51.723
Quality
58.7377
Cost
Reporting: Group practice
Hospital and facility affiliations
Facilities where Stacey Tien, P.A. - C 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.
Vascular And Interventional Specialists OF Orange County, Inc.
Orange, 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 Stacey Tien, P.A. - C. Source: openpaymentsdata.cms.gov.
Total received
$539
Largest payer
Medtronic, Inc.
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 Stacey Tien, P.A. - C. To verify Stacey Tien, P.A. - 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.
Brand vs generic prescribing mix · Above average
Stacey Tien, P.A. - C - brand share 25.0%
Vascular Surgery Physician average
25% brand-name claims vs 75% generic, on 252 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.
252
Total Claims
$45K
Total Drug Cost
138
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 307
- Total Day Supply
- 5,094
- Brand vs Generic
- 25% brand / 75% generic
- Brand Drug Cost
- $43K
- Generic Drug Cost
- $2K
- Opioid Claims
- 63 (25.0% rate)
- Antibiotic Claims
- 29
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 3.04
- Gender Split
- 46% female / 54% male
- Age Distribution
- <65: 13, 65-74: 55, 75-84: 54, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Stacey Tien, P.A. - C prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
56 claims
- Santyl
Santyl
36 claims
- Lorazepam
Lorazepam
27 claims
- Diazepam
Diazepam
24 claims
- Clopidogrel
Clopidogrel
23 claims
- Eliquis 21
Eliquis
21 claims
- Sulfamethoxazole-T… 15
Sulfamethoxazole-Trimethoprim
15 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 56 |
| Santyl Collagenase Clostridium Hist. | 36 |
| Lorazepam | 27 |
| Diazepam | 24 |
| Clopidogrel Clopidogrel Bisulfate | 23 |
| Eliquis Apixaban | 21 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Vascular Surgery Physician Overview
How Stacey Tien, P.A. - C fits within the Vascular Surgery Physician landscape nationally.
4,215
Vascular Surgery Physician Providers in US
53
States with Vascular Surgery Physician
205
Avg Claims per Provider
Stacey Tien, P.A. - C's 252 claims are above the specialty average of 205.
Nearby Vascular Surgery Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Tien.
Dr. Arad Abadi
MD
Lancaster, CA
Dr. Andrew Abi-Chaker
M.D.
Sherman Oaks, CA
Dr. Ahmed Abou-Zamzam
M.D.
Loma Linda, CA
Dr. Joseph Abu-Dalu
MD
Los Angeles, CA
Dr. Queen Abure
MD
San Francisco, CA
Compare Vascular Surgery 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 Vascular Surgery 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 Stacey Tien, P.A. - C's specialty? ▼
Stacey Tien, P.A. - C specializes in Vascular Surgery Physician and practices in Orange, California. Credentials: P.A. - C.
How much does Stacey Tien, P.A. - C prescribe under Medicare Part D? ▼
In 2023, Stacey Tien, P.A. - C wrote 252 Medicare Part D claims totaling $45K in drug costs for 138 beneficiaries.
What is Stacey Tien, P.A. - C's Medicare quality score? ▼
Stacey Tien, P.A. - C has a CMS MIPS Final Score of 78.1/100 (Quality: 51.7, Cost: 58.7). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Stacey Tien, P.A. - C located? ▼
Stacey Tien, P.A. - C is located at 1140 W LA VETA AVE, Orange, CA, 92868. Phone: (714) 560-4450.
What is Stacey Tien, P.A. - C's NPI number? ▼
Stacey Tien, P.A. - C's National Provider Identifier (NPI) is 1770583056, issued on 07/28/2005.
Does Stacey Tien, P.A. - C prescribe more brand-name or generic drugs? ▼
Stacey Tien, P.A. - C's prescribing is 25% brand-name and 75% generic drugs by claim count, with $43K in brand drug costs.
Does Stacey Tien, P.A. - C prescribe opioids? ▼
Yes, Stacey Tien, P.A. - C had 63 opioid claims in 2023 with an opioid prescribing rate of 25.0%.
How many Vascular Surgery Physician providers are there in the US? ▼
There are 4,215 Vascular Surgery Physician providers across 53 states in the US. The average Vascular Surgery Physician provider writes 205 Medicare Part D claims per year.
What drugs does Stacey Tien, P.A. - C prescribe most often? ▼
Based on 2023 Medicare Part D data, Stacey Tien, P.A. - C's most frequently prescribed drugs include Hydrocodone-Acetaminophen, Santyl, Lorazepam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Stacey Tien, P.A. - C accept Medicare? ▼
Stacey Tien, P.A. - C appears in CMS Medicare data with 252 Part D claims and 138 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Stacey Tien, P.A. - C's credentials? ▼
Stacey Tien, P.A. - C's NPI is 1770583056 with credentials P.A. - 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 (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.