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2026 NPPES data Surgical Physician Assistant NPI 1043786791
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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 16,380 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
141
Medicare Part D claims · 94 beneficiaries · Surgical Physician Assistant avg: 341
MIPS score
33.5/100
▼ 50 pts below national avg 83.5 · Below average
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Lois Yang reported a CMS MIPS final score of 33.5/100 - below the 83.5 national average - and filed 141 Medicare Part D claims in 2024.

33.5/100
MIPS score · -50 vs avg
141
Part D claims, 2024
≥4th
pct among measured MIPS (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 Lois Yang

Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.

  • Verified

    NPI registry status

    Active listing in the CMS National Provider Identifier Registry (NPI 1043786791), first enumerated 10/21/2018.

    Source: CMS NPPES

  • Reported

    Medicare Part D participation

    Filed 141 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.

    Source: CMS Part D Prescriber PUF

  • Reported

    CMS quality reporting (MIPS)

    Reported a CMS MIPS final score of 33.5/100 in the Quality Payment Program — a federal quality measure, not a patient review.

    Source: CMS Quality Payment Program

  • State context

    State board disciplinary context

    California statewide board action statistics are published annually — these figures describe aggregate state activity, not Lois Yang'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 1043786791 · Surgical Physician Assistant

NPI-10 · ENUM-RECENT · TAX-MID · MIPS-LOW · RX-LIGHT · BOOK-LIGHT · PHOTO-FINISH

  • NPI-10 1043786791
  • ENUM-RECENT 2018
  • TAX-MID 16K Surgical Physician
  • MIPS-LOW 33.5/100
  • RX-LIGHT 141
  • BOOK-LIGHT 992 in California
  • PHOTO-FINISH Kaitlin Cavanagh, PA · ±0.7

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

Lois Yang'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.

34 ≥ 4th percentile 4% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). This entry sits in this band. 40–50: 2,928 measured providers (1%). Above this entry. 50–60: 5,882 measured providers (1%). Above this entry. 60–70: 13,906 measured providers (3%). Above this entry. 70–80: 94,570 measured providers (21%). Above this entry. 80–90: 129,887 measured providers (29%). Above this entry. 90+: 189,403 measured providers (42%). Above this entry. This provider 0 100 every measured MIPS clinician, bucketed by value

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 Lois Yang sits

This provider among surgical physician assistant peers

Across the 3,657 surgical physician assistant providers who report both Medicare Part D prescribing and a MIPS quality score, Lois Yang writes more Part D claims than 50% of them and scores higher on MIPS quality than 1% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 62 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 27Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 87 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 92Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 87Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 62Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 17Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 40Lois Yang, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 1
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 average

NPI registry status

Active

Issued 10/21/2018

NPI 1043786791

Primary specialty

Surgical Physician Assistant

Mid-sized

16,380 US NPIs in this specialty

Medicare Part D claims

141 59% vs specialty avg

2024 prescription claims

Specialty avg: 341

MIPS final score

33.5/100 50 pts vs avg

Below average band

vs 83.5 national avg

Specialty distribution in California

How Surgical Physician Assistant compares to other specialties among California providers

California providers
Behavior Technician17.9%Marriage & Family Therapist5.4%Student in an Organized Heal…5.1%Mental Health Counselor3.7%Pharmacist3.4%Clinical Social Worker3.1%Surgical Physician Assistant0.1%
Largest specialties in California (% of in-state providers)

Medicare quality performance, MIPS

Lois Yang's 2023 MIPS final score plotted against the Surgical Physician Assistant national average

Below national average
MIPS Final Score
33.5/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%33.5%
MIPS final score (Surgical Physician Assistant) - 33.5/100 vs national avg 83.5
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

316 S STRATFORD AVE
Santa Maria, CA 93454
(805) 348-3700

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
Measured-score avg: 83.5
30.5595
Quality
56.1981
Cost
0
Promoting Interoperability

Reporting: Group practice

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 2024.

141
Total Claims
$2K
Total Drug Cost
94
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
145.433
Total Day Supply
1,155
Generic Drug Cost
$2K
Opioid Claims
72 (51.1% rate)
Antibiotic Claims
27

Patient Demographics

Average Patient Age
75.3 years
Avg HCC Risk Score
1.20
Gender Split
44% female / 56% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.

What Lois Yang prescribes most

Top Medicare Part D drugs by claim count, 2024

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2024
Drug Claims
Tramadol Hcl
 38
Ibuprofen
 19
Hydrocodone-Acetaminophen
Hydrocodone/Acetaminophen
17
Oxycodone Hcl
 17

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

More Surgical Physician Assistant in CA → All providers in California → Compare specialties →

Surgical Physician Assistant Overview

How Lois Yang fits within the Surgical Physician Assistant landscape nationally.

16,380
Surgical Physician Assistant Providers in US
54
States with Surgical Physician Assistant
341
Avg Claims per Provider

Lois Yang's 141 claims are below the specialty average of 341.

Nationwide Surgical Physician Assistant 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 (33.5 here).

Kaitlin Cavanagh 32.8 IL Jenna Little 34.7 CT Kelly Smyth 31.2 CT Rose Christensen 31.1 CO

Same NPPES enumeration year (2018)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

Ryan Williams Aurora, CO Nishan Thapa Corpus Christi, TX Jesus Narcizo El Paso, TX Tracy Powell Frisco, TX

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.

One of 992 Surgical Physician Assistant providers enrolled in California, 5 are shown here.

Terri Abbott
P.A.
La Jolla, CA
Jory Adam
PA-C
Greenbrae, CA
Zulhumar Adil
PA-C
Fullerton, CA
Neil Adler
PA
San Jose, CA
Jennifer Afari
PA-C
Beverly Hills, CA

Compare Surgical Physician Assistant nationally: see state-by-state distribution →

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 2024, Lois Yang wrote 141 Medicare Part D claims totaling $2K in drug costs for 94 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 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 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 72 opioid claims in 2024 with an opioid prescribing rate of 51.1%.
How many Surgical Physician Assistant providers are there in the US? ▼
There are 16,380 Surgical Physician Assistant providers across 54 states in the US. The average Surgical Physician Assistant provider writes 341 Medicare Part D claims per year.
What drugs does Lois Yang prescribe most often? ▼
Based on 2024 Medicare Part D data, Lois Yang's most frequently prescribed drugs include Tramadol Hcl, Ibuprofen, Hydrocodone-Acetaminophen. 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 141 Part D claims and 94 Medicare beneficiaries in 2024. 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 (2024). 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 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

Compiled from official public sources by the editorial process.

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.