NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1639604523 MD
Verify on CMS → Vivian Yang, MD
Family Medicine Physician in Moreno Valley, 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 147,760 in Family 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
673
Medicare Part D claims · 166 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
83%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.5 · Exceptional
Industry payments
$21.51
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Vivian Yang, MD reported a CMS MIPS final score of 100/100 - above the 83.5 national average - and filed 673 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 673
- Part D claims, 2023
- 83%
- 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.
CMS NPPES provider registry desk
NPI 1639604523 · Family Medicine Physician
NPI-10 · ENUM-RECENT · TAX-MEGA · MIPS-ELITE · RX-LIGHT · BOOK-MID · PHOTO-FINISH
- NPI-10 1639604523
- ENUM-RECENT 2017
- TAX-MEGA 148K Family Medicine
- MIPS-ELITE 100/100
- RX-LIGHT 673
- BOOK-MID 15,933 in California
- PHOTO-FINISH Kellie Aarons · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Yang · this prov…
Yang · this provider
100 MIPS pts
- Muriam Afzal · h…
Muriam Afzal
100 MIPS pts
- Kellie Aarons · …
Kellie Aarons
100 MIPS pts
- Margaret Abate ·…
Margaret Abate
100 MIPS pts
- Jordan Adams · n…
Jordan Adams
100 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Vivian Yang, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
100 ≥ 92nd percentile 92% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Vivian Yang, MD sits
This provider among family medicine physician peers
Across the 21,266 family medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Vivian Yang, MD writes more Part D claims than 29% of them and scores higher on MIPS quality than 95% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one family medicine physician peer from a representative sample of 60; the gold marker is Vivian Yang, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Vivian Yang, MD 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 Vivian Yang, MD?
High performer (top quartile)Primary specialty
Family Medicine Physician
Medicare Part D claims
673 80% vs specialty avg
MIPS final score
100/100 16.5 pts vs avg
Specialty distribution in California
How Family Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Vivian Yang, MD's 2023 MIPS final score plotted against the Family Medicine Physician national average
- MIPS Final Score
- 100/100
- vs 83.5 national avg · 2023 performance year
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 | 1639604523 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 04/27/2017 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Measured-score avg: 83.5
90
Quality
78.9495
Cost
98
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Vivian Yang, MD 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.
Canyon Springs Medical Group Inc
Moreno Valley, 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 Vivian Yang, MD. Source: openpaymentsdata.cms.gov.
Total received
$22
Largest payer
Bard Peripheral Vascular, 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 Vivian Yang, MD. To verify Vivian Yang, 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 · Typical
Vivian Yang, MD - brand share 15.0%
Family Medicine Physician average
15% brand-name claims vs 83% generic, on 673 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.
673
Total Claims
$71K
Total Drug Cost
166
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,294
- Total Day Supply
- 37,677
- Brand vs Generic
- 15% brand / 83% generic
- Brand Drug Cost
- $60K
- Generic Drug Cost
- $10K
Patient Demographics
- Average Patient Age
- 65.8 years
- Avg HCC Risk Score
- 1.81
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 51, 65-74: 92, 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 Vivian Yang, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
48 claims
- Famotidine
Famotidine
46 claims
- Amlodipine Besylate
Amlodipine Besylate
31 claims
- Levothyroxine Sodium
Levothyroxine Sodium
23 claims
- Benazepril Hcl
Benazepril Hcl
22 claims
- Hydrochlorothiazide
Hydrochlorothiazide
21 claims
- Gabapentin
Gabapentin
20 claims
- Losartan Potassium 19
Losartan Potassium
19 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 48 |
| Famotidine | 46 |
| Amlodipine Besylate | 31 |
| Levothyroxine Sodium | 23 |
| Benazepril Hcl | 22 |
| Hydrochlorothiazide | 21 |
| Gabapentin | 20 |
| Losartan Potassium | 19 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 16 |
| Ibuprofen | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Vivian Yang, MD fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Vivian Yang, MD's 673 claims are below the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Yang, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (100 here).
Same NPPES enumeration year (2017)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Yang.
One of 15,933 Family Medicine Physician providers enrolled in California, 5 are shown here.
Dr. Omer Aba-Omer
MD
Santa Monica, CA
Dr. Michelle Ababa
MD
Wilmington, CA
Dr. Anna Tzeitel Abalos
MD
Roseville, CA
Dr. Adan Abarca
MD
Anaheim, CA
Dr. Lorraine Abate
M.D.
Sacramento, CA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Vivian Yang, MD's specialty? ▼
Vivian Yang, MD specializes in Family Medicine Physician and practices in Moreno Valley, California. Credentials: MD.
How much does Vivian Yang, MD prescribe under Medicare Part D? ▼
In 2023, Vivian Yang, MD wrote 673 Medicare Part D claims totaling $71K in drug costs for 166 beneficiaries.
What is Vivian Yang, MD's Medicare quality score? ▼
Vivian Yang, MD has a CMS MIPS Final Score of 100/100 (Quality: 90, Cost: 78.9). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Vivian Yang, MD located? ▼
Vivian Yang, MD is located at 23520 CACTUS AVE, Moreno Valley, CA, 92553. Phone: (951) 867-3900.
What is Vivian Yang, MD's NPI number? ▼
Vivian Yang, MD's National Provider Identifier (NPI) is 1639604523, issued on 04/27/2017.
Does Vivian Yang, MD prescribe more brand-name or generic drugs? ▼
Vivian Yang, MD's prescribing is 15% brand-name and 83% generic drugs by claim count, with $60K in brand drug costs.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Vivian Yang, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Vivian Yang, MD's most frequently prescribed drugs include Atorvastatin Calcium, Famotidine, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Vivian Yang, MD accept Medicare? ▼
Vivian Yang, MD appears in CMS Medicare data with 673 Part D claims and 166 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Vivian Yang, MD's credentials? ▼
Vivian Yang, MD's NPI is 1639604523 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.
- 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
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.