NPI registry status
Active
2026 NPPES data Registered Nurse NPI 1255203139
Verify on CMS → Ying Ying Hui
Registered Nurse in South 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 177,204 in Registered Nurse, 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.
What the federal data shows
Ying Ying Hui is a Registered Nurse in South San Francisco, California, listed in the federal CMS National Provider Identifier registry.
- #15
- Registered Nurse rank among California specialties
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 1255203139 · Registered Nurse
NPI-10 · ENUM-NEW · TAX-MEGA · RX-NONE · BOOK-MID · PHOTO-ENUM
- NPI-10 1255203139
- ENUM-NEW 2025
- TAX-MEGA 177K Registered Nurse
- RX-NONE No Part D
- BOOK-MID 15,601 in California
- PHOTO-ENUM Orlando Castro Maldo… · 2025
What does the federal data show about Ying Ying Hui?
Quality data not reportedPrimary specialty
Registered Nurse
Specialty distribution in California
How Registered Nurse compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Registered Nurse. Verify directly:
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 | 1255203139 |
|---|---|
| Specialty | Registered Nurse |
| Gender | Female |
| NPI Issued | 09/22/2025 |
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 Ying Ying Hui. To verify Ying Ying Hui'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.
Registered Nurse Overview
How Ying Ying Hui fits within the Registered Nurse landscape nationally.
177,204
Registered Nurse Providers in US
56
States with Registered Nurse
1,000
Avg Claims per Provider
Nationwide Registered Nurse peers with similar MIPS or enrollment year
Two federal-record peer sets for Hui, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2025)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Registered Nurse Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Hui.
One of 15,601 Registered Nurse providers enrolled in California, 5 are shown here.
Dr. Patricia A Onyango
RN
Modesto, CA
Dr. Adelaida A Zavala
RN
Ontario, CA
Dr. Anu Aaltonen-Bond
RN
Rancho Cordova, CA
Victoria Aardappel
Chico, CA
Dr. Denise Aaron
RN
San Diego, CA
Compare Registered Nurse nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ying Ying Hui's specialty? ▼
Ying Ying Hui specializes in Registered Nurse and practices in South San Francisco, California.
Where is Ying Ying Hui located? ▼
Ying Ying Hui is located at 3875 CARTER DR APT 301, South San Francisco, CA, 94080. Phone: (415) 568-7700.
What is Ying Ying Hui's NPI number? ▼
Ying Ying Hui's National Provider Identifier (NPI) is 1255203139, issued on 09/22/2025.
How many Registered Nurse providers are there in the US? ▼
There are 177,204 Registered Nurse providers across 56 states in the US. The average Registered Nurse provider writes 1,000 Medicare Part D claims per year.
Does Ying Ying Hui accept Medicare? ▼
Ying Ying Hui appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ying Ying Hui's credentials? ▼
Ying Ying Hui's NPI is 1255203139. 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.
- 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.