NPI registry status
Active
2026 NPPES data Surgical Physician Assistant NPI 1043786791
Verify on CMS → Lois Yang
Surgical Physician Assistant in Santa Maria, 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 16,179 in Surgical 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
114
Medicare Part D claims · 83 beneficiaries · Surgical Physician Assistant avg: 316
MIPS score
33.5/100
▼ 50 pts below national avg 83.1 · Below average
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Lois Yang reported a CMS MIPS final score of 33.5/100 - below the 83.1 national average - and filed 114 Medicare Part D claims in 2023.
- 33.5/100
- MIPS score · -50 vs avg
- 114
- Part D claims, 2023
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.
Lois Yang's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
34 3rd percentile higher than 3% 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 Lois Yang sits
This provider among surgical physician assistant peers
Across the 3,708 surgical physician assistant providers who report both Medicare Part D prescribing and a MIPS quality score, Lois Yang writes more Part D claims than 43% of them and scores higher on MIPS quality than 1% - placing this provider in the lower-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 surgical physician assistant peer from a representative sample of 60; the gold marker is Lois Yang. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Lois Yang?
Below national averagePrimary specialty
Surgical Physician Assistant
Medicare Part D claims
114 64% vs specialty avg
MIPS final score
33.5/100 49.6 pts vs avg
Specialty distribution in California
How Surgical Physician Assistant compares to other specialties among California providers
Medicare quality performance, MIPS
Lois Yang's 2023 MIPS final score plotted against the Surgical Physician Assistant national average
- MIPS Final Score
- 33.5/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Surgical Physician Assistant) - 33.5/100 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).
Lois Yang appears in the CMS NPPES registry as a Surgical Physician Assistant provider at 316 S STRATFORD AVE, Santa Maria, CA, 93454, with a listed phone of (805) 348-3700. NPI 1043786791 was issued on 10/21/2018.
Medicare Part D records for calendar year 2023 show 114 prescription claims written by this provider, covering 83 Medicare beneficiaries and totaling roughly $1K in drug spend, with an opioid prescribing rate of 50.9%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 33.5/100 for the 2023 performance year (Quality 30.6, Cost 56.2), compared with the national average of 83.1.
Surgical Physician Assistant is a mid-sized specialty nationwide, with 16,179 enrolled providers across 54 states and an average of 316 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 | 1043786791 |
|---|---|
| Specialty | Surgical Physician Assistant |
| Gender | Female |
| NPI Issued | 10/21/2018 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
33.5273
Final Score
Avg: 83.1
30.5595
Quality
56.1981
Cost
0
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Lois Yang 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.
Southern California Permanente Medical Group
Anaheim, 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).
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 Lois Yang. To verify Lois Yang'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 2023.
114
Total Claims
$1K
Total Drug Cost
83
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 116
- Total Day Supply
- 934
- Generic Drug Cost
- $1K
- Opioid Claims
- 58 (50.9% rate)
- Antibiotic Claims
- 24
Patient Demographics
- Average Patient Age
- 72.7 years
- Avg HCC Risk Score
- 1.74
- Gender Split
- 52% female / 48% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Lois Yang prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tramadol Hcl
Tramadol Hcl
28 claims
- Oxycodone Hcl
Oxycodone Hcl
23 claims
- Ibuprofen
Ibuprofen
13 claims
| Drug | Claims |
|---|---|
| Tramadol Hcl | 28 |
| Oxycodone Hcl | 23 |
| Ibuprofen | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Surgical Physician Assistant Overview
How Lois Yang fits within the Surgical Physician Assistant landscape nationally.
16,179
Surgical Physician Assistant Providers in US
54
States with Surgical Physician Assistant
316
Avg Claims per Provider
Lois Yang's 114 claims are below the specialty average of 316.
Nearby Surgical Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Yang.
Dr. Terri Abbott
P.A.
La Jolla, CA
Dr. Emily Abdinor
PA-C
Sacramento, CA
Dr. Jory Adam
PA-C
Rancho Santa Margarita, CA
Dr. Zulhumar Adil
PA-C
Fullerton, CA
Dr. Neil Adler
PA
San Jose, CA
Compare Surgical Physician Assistant 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 Surgical Physician Assistant 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
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
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 Lois Yang's specialty? ▼
Lois Yang specializes in Surgical Physician Assistant and practices in Santa Maria, California.
How much does Lois Yang prescribe under Medicare Part D? ▼
In 2023, Lois Yang wrote 114 Medicare Part D claims totaling $1K in drug costs for 83 beneficiaries.
What is Lois Yang's Medicare quality score? ▼
Lois Yang has a CMS MIPS Final Score of 33.5/100 (Quality: 30.6, Cost: 56.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Lois Yang located? ▼
Lois Yang is located at 316 S STRATFORD AVE, Santa Maria, CA, 93454. Phone: (805) 348-3700.
What is Lois Yang's NPI number? ▼
Lois Yang's National Provider Identifier (NPI) is 1043786791, issued on 10/21/2018.
Does Lois Yang prescribe opioids? ▼
Yes, Lois Yang had 58 opioid claims in 2023 with an opioid prescribing rate of 50.9%.
How many Surgical Physician Assistant providers are there in the US? ▼
There are 16,179 Surgical Physician Assistant providers across 54 states in the US. The average Surgical Physician Assistant provider writes 316 Medicare Part D claims per year.
What drugs does Lois Yang prescribe most often? ▼
Based on 2023 Medicare Part D data, Lois Yang's most frequently prescribed drugs include Tramadol Hcl, Oxycodone Hcl, Ibuprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Lois Yang accept Medicare? ▼
Lois Yang appears in CMS Medicare data with 114 Part D claims and 83 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Lois Yang's credentials? ▼
Lois Yang's NPI is 1043786791. 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.
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.