NPI registry status
Active
2026 NPPES data Specialist NPI 1114098415 M.D.
Verify on CMS → Leewen Liu, M.D.
Specialist in Saratoga, 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 69,608 in Specialist, 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
1K
Medicare Part D claims · 119 beneficiaries · Specialist avg: 1K
Industry payments
$17.44
1 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Leewen Liu, M.D. filed 1,263 Medicare Part D claims in 2023 as a Specialist in Saratoga, California.
- 1K
- Part D claims, 2023
- $17.44
- industry payments (Sunshine Act)
- ≥78th
- 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.
Leewen Liu, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,263 ≥ 78th percentile 78% 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
What does the federal data show about Leewen Liu, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
1,263 14% vs specialty avg
Specialty distribution in California
How Specialist 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 Specialist. 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).
Leewen Liu, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 19040 COX AVE, Saratoga, CA, 95070, with a listed phone of (408) 973-8861. NPI 1114098415 was issued on 11/10/2006.
Medicare Part D records for calendar year 2023 show 1,263 prescription claims written by this provider, covering 119 Medicare beneficiaries and totaling roughly $108K in drug spend.
Specialist is a high-volume specialty nationwide, with 69,608 enrolled providers across 55 states and an average of 1,474 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 | 1114098415 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 11/10/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Leewen Liu, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$17
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Leewen Liu, M.D.. To verify Leewen Liu, M.D.'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.
1,263
Total Claims
$108K
Total Drug Cost
119
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,303
- Total Day Supply
- 97,665
- Generic Drug Cost
- $21K
- Antibiotic Claims
- 42
Patient Demographics
- Average Patient Age
- 72.6 years
- Avg HCC Risk Score
- 0.58
- Gender Split
- 66% female / 34% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Leewen Liu, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
240 claims
- Losartan Potassium
Losartan Potassium
157 claims
- Amlodipine Besylate
Amlodipine Besylate
152 claims
- Metoprolol Succinate 90
Metoprolol Succinate
90 claims
- Levothyroxine Sodium 88
Levothyroxine Sodium
88 claims
- Metformin Hcl 66
Metformin Hcl
66 claims
- Alendronate Sodium 39
Alendronate Sodium
39 claims
- Pantoprazole Sodium 35
Pantoprazole Sodium
35 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 240 |
| Losartan Potassium | 157 |
| Amlodipine Besylate | 152 |
| Metoprolol Succinate | 90 |
| Levothyroxine Sodium | 88 |
| Metformin Hcl | 66 |
| Alendronate Sodium | 39 |
| Pantoprazole Sodium | 35 |
| Glimepiride | 26 |
| Januvia Sitagliptin Phosphate | 23 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Leewen Liu, M.D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Leewen Liu, M.D.'s 1,263 claims are below the specialty average of 1,474.
Nearby Specialist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Liu.
Adrienne Abad Santos
San Francisco, CA
Dr. Brenda Abarca
MD
Torrance, CA
Dr. Fatemeh Abbasi
PT
Van Nuys, CA
Dr. Erlinda Abcede
M.D.
Cudahy, CA
Dr. Maher Abdallah
M.D.
Palm Springs, CA
Compare Specialist 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 Specialist 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.
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Medical Specialties Explained
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Frequently Asked Questions
What is Leewen Liu, M.D.'s specialty? ▼
Leewen Liu, M.D. specializes in Specialist and practices in Saratoga, California. Credentials: M.D..
How much does Leewen Liu, M.D. prescribe under Medicare Part D? ▼
In 2023, Leewen Liu, M.D. wrote 1,263 Medicare Part D claims totaling $108K in drug costs for 119 beneficiaries.
Where is Leewen Liu, M.D. located? ▼
Leewen Liu, M.D. is located at 19040 COX AVE, Saratoga, CA, 95070. Phone: (408) 973-8861.
What is Leewen Liu, M.D.'s NPI number? ▼
Leewen Liu, M.D.'s National Provider Identifier (NPI) is 1114098415, issued on 11/10/2006.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Leewen Liu, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Leewen Liu, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Losartan Potassium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Leewen Liu, M.D. accept Medicare? ▼
Leewen Liu, M.D. appears in CMS Medicare data with 1,263 Part D claims and 119 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Leewen Liu, M.D.'s credentials? ▼
Leewen Liu, M.D.'s NPI is 1114098415 with credentials M.D.. 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.