NPI registry status
Active
2026 NPPES data Adult Health Nurse Practitioner NPI 1811312408
Verify on CMS → Yi Lin Ngai
Adult Health Nurse Practitioner in San Francisco, 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 29,519 in Adult Health Nurse Practitioner, 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
3K
Medicare Part D claims · 439 beneficiaries · Adult Health Nurse Practitioner avg: 1K
MIPS score
90.3/100
▲ 7 pts above national avg 83.5 · Exceptional
What the federal data shows
Yi Lin Ngai reported a CMS MIPS final score of 90.3/100 - above the 83.5 national average - and filed 3,011 Medicare Part D claims in 2023.
- 90.3/100
- MIPS score · +7 vs avg
- 3K
- Part D claims, 2023
- ≥58th
- 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.
CMS NPPES provider registry desk
NPI 1811312408 · Adult Health Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MID · MIPS-ABOVE · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1811312408
- ENUM-MID 2014
- TAX-MID 30K Adult Health
- MIPS-ABOVE 90.3/100
- RX-MID 3,011
- BOOK-LIGHT 1,464 in California
- PHOTO-FINISH Kim Bagley · ±0.1
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Kim Bagley · low…
Kim Bagley
90.2 MIPS pts
- Katlyn Banker · …
Katlyn Banker
90.2 MIPS pts
- Theresa Cadieux-…
Theresa Cadieux-Milliken
90.2 MIPS pts
- Ngai · this prov…
Ngai · this provider
90.3 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Yi Lin Ngai'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.
90 ≥ 58th percentile 58% 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 Yi Lin Ngai sits
This provider among adult health nurse practitioner peers
Across the 4,201 adult health nurse practitioner providers who report both Medicare Part D prescribing and a MIPS quality score, Yi Lin Ngai writes more Part D claims than 91% of them and scores higher on MIPS quality than 59% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one adult health nurse practitioner peer from a representative sample of 60; the gold marker is Yi Lin Ngai. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Yi Lin Ngai?
High performer (top quartile)Primary specialty
Adult Health Nurse Practitioner
Medicare Part D claims
3,011 151% vs specialty avg
MIPS final score
90.3/100 6.8 pts vs avg
Specialty distribution in California
How Adult Health Nurse Practitioner compares to other specialties among California providers
Medicare quality performance, MIPS
Yi Lin Ngai's 2023 MIPS final score plotted against the Adult Health Nurse Practitioner national average
- MIPS Final Score
- 90.3/100
- 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 | 1811312408 |
|---|---|
| Specialty | Adult Health Nurse Practitioner |
| Gender | Female |
| NPI Issued | 02/19/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
90.2542
Final Score
Measured-score avg: 83.5
70.0332
Quality
81.6475
Cost
99
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Yi Lin Ngai 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.
City And County OF San Francisco
San Francisco, 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 Yi Lin Ngai. To verify Yi Lin Ngai'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.
3,011
Total Claims
$328K
Total Drug Cost
439
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 7,792
- Total Day Supply
- 228,470
- Generic Drug Cost
- $97K
- Antibiotic Claims
- 26
Patient Demographics
- Average Patient Age
- 72.2 years
- Avg HCC Risk Score
- 0.89
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 14, 65-74: 307, 75-84: 99, 85+: 19
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Yi Lin Ngai prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
499 claims
- Amlodipine Besylate
Amlodipine Besylate
243 claims
- Losartan Potassium
Losartan Potassium
213 claims
- Metformin Hcl 132
Metformin Hcl
132 claims
- Alendronate Sodium 115
Alendronate Sodium
115 claims
- Metoprolol Succinate 97
Metoprolol Succinate
97 claims
- Diclofenac Sodium 91
Diclofenac Sodium
91 claims
- Benazepril Hcl 73
Benazepril Hcl
73 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 499 |
| Amlodipine Besylate | 243 |
| Losartan Potassium | 213 |
| Metformin Hcl | 132 |
| Alendronate Sodium | 115 |
| Metoprolol Succinate | 97 |
| Diclofenac Sodium | 91 |
| Benazepril Hcl | 73 |
| Hydrochlorothiazide | 72 |
| Famotidine | 70 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Adult Health Nurse Practitioner Overview
How Yi Lin Ngai fits within the Adult Health Nurse Practitioner landscape nationally.
29,519
Adult Health Nurse Practitioner Providers in US
55
States with Adult Health Nurse Practitioner
1,201
Avg Claims per Provider
Yi Lin Ngai's 3,011 claims are above the specialty average of 1,201.
Nationwide Adult Health Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Ngai, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (90.3 here).
Same NPPES enumeration year (2014)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Adult Health Nurse Practitioner Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Ngai.
One of 1,464 Adult Health Nurse Practitioner providers enrolled in California, 5 are shown here.
Dr. Joel Aandahl
NP
Vallejo, CA
Dr. Maria Katrina Abad
AGPCNP-BC
San Carlos, CA
Dr. Corey Abbott
N.P.
Claremont, CA
Dr. Michael Abney
FNP
Pleasanton, CA
Dr. Ilona Abramova
NP
West Hills, CA
Compare Adult Health Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Yi Lin Ngai's specialty? ▼
Yi Lin Ngai specializes in Adult Health Nurse Practitioner and practices in San Francisco, California.
How much does Yi Lin Ngai prescribe under Medicare Part D? ▼
In 2023, Yi Lin Ngai wrote 3,011 Medicare Part D claims totaling $328K in drug costs for 439 beneficiaries.
What is Yi Lin Ngai's Medicare quality score? ▼
Yi Lin Ngai has a CMS MIPS Final Score of 90.3/100 (Quality: 70, Cost: 81.6). 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 Yi Lin Ngai located? ▼
Yi Lin Ngai is located at 929 CLAY ST, San Francisco, CA, 94108. Phone: (415) 956-6633.
What is Yi Lin Ngai's NPI number? ▼
Yi Lin Ngai's National Provider Identifier (NPI) is 1811312408, issued on 02/19/2014.
How many Adult Health Nurse Practitioner providers are there in the US? ▼
There are 29,519 Adult Health Nurse Practitioner providers across 55 states in the US. The average Adult Health Nurse Practitioner provider writes 1,201 Medicare Part D claims per year.
What drugs does Yi Lin Ngai prescribe most often? ▼
Based on 2023 Medicare Part D data, Yi Lin Ngai's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Yi Lin Ngai accept Medicare? ▼
Yi Lin Ngai appears in CMS Medicare data with 3,011 Part D claims and 439 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Yi Lin Ngai's credentials? ▼
Yi Lin Ngai's NPI is 1811312408. 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.