NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1386177004
Verify on CMS → Katherine Wei
Family Medicine Physician in San Rafael, 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
570
Medicare Part D claims · 152 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
81%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Katherine Wei filed 570 Medicare Part D claims in 2023 as a Family Medicine Physician in San Rafael, California, prescribing 81% generic.
- 570
- Part D claims, 2023
- 81%
- generic prescribing
- ≥66th
- pct by Part D claim volume (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 Katherine Wei
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1386177004), first enumerated 04/10/2017.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 570 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Katherine Wei'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 1386177004 · Family Medicine Physician
NPI-10 · ENUM-RECENT · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1386177004
- ENUM-RECENT 2017
- TAX-MEGA 148K Family Medicine
- RX-LIGHT 570
- BOOK-MID 15,933 in California
- PHOTO-ENUM Jared James · 2017
Katherine Wei's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
570 ≥ 66th percentile 66% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. 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 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Katherine Wei practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Katherine Wei?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
570 83% vs specialty avg
Specialty distribution in California
How Family Medicine Physician 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 Family Medicine Physician. 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 | 1386177004 |
|---|---|
| Specialty | Family Medicine Physician |
| Gender | Female |
| NPI Issued | 04/10/2017 |
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 Katherine Wei. To verify Katherine Wei'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
Katherine Wei - brand share 17.0%
Family Medicine Physician average
17% brand-name claims vs 81% generic, on 570 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.
570
Total Claims
$69K
Total Drug Cost
152
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,347
- Total Day Supply
- 39,665
- Brand vs Generic
- 17% brand / 81% generic
- Brand Drug Cost
- $53K
- Generic Drug Cost
- $16K
- Opioid Claims
- 13 (2.3% rate)
Patient Demographics
- Average Patient Age
- 70.6 years
- Avg HCC Risk Score
- 1.35
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 25, 65-74: 73, 75-84: 43, 85+: 11
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Katherine Wei prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
74 claims
- Metformin Hcl
Metformin Hcl
45 claims
- Amlodipine Besylate
Amlodipine Besylate
36 claims
- Benazepril Hcl 23
Benazepril Hcl
23 claims
- Fluticasone Propio… 21
Fluticasone Propionate
21 claims
- Levothyroxine Sodium 19
Levothyroxine Sodium
19 claims
- Jardiance 17
Jardiance
17 claims
- Omeprazole 17
Omeprazole
17 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 74 |
| Metformin Hcl | 45 |
| Amlodipine Besylate | 36 |
| Benazepril Hcl | 23 |
| Fluticasone Propionate | 21 |
| Levothyroxine Sodium | 19 |
| Jardiance Empagliflozin | 17 |
| Omeprazole | 17 |
| Hydrochlorothiazide | 11 |
| Lisinopril | 11 |
* 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 Katherine Wei 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
Katherine Wei's 570 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 Wei, both outside California so the neighborhoods are not geographic containment.
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 Wei.
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 Katherine Wei's specialty? ▼
Katherine Wei specializes in Family Medicine Physician and practices in San Rafael, California.
How much does Katherine Wei prescribe under Medicare Part D? ▼
In 2023, Katherine Wei wrote 570 Medicare Part D claims totaling $69K in drug costs for 152 beneficiaries.
Where is Katherine Wei located? ▼
Katherine Wei is located at 3110 KERNER BLVD, San Rafael, CA, 94901. Phone: (415) 448-1500.
What is Katherine Wei's NPI number? ▼
Katherine Wei's National Provider Identifier (NPI) is 1386177004, issued on 04/10/2017.
Does Katherine Wei prescribe more brand-name or generic drugs? ▼
Katherine Wei's prescribing is 17% brand-name and 81% generic drugs by claim count, with $53K in brand drug costs.
Does Katherine Wei prescribe opioids? ▼
Yes, Katherine Wei had 13 opioid claims in 2023 with an opioid prescribing rate of 2.3%.
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 Katherine Wei prescribe most often? ▼
Based on 2023 Medicare Part D data, Katherine Wei's most frequently prescribed drugs include Atorvastatin Calcium, Metformin Hcl, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Katherine Wei accept Medicare? ▼
Katherine Wei appears in CMS Medicare data with 570 Part D claims and 152 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Katherine Wei's credentials? ▼
Katherine Wei's NPI is 1386177004. 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.
- 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.