NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1700889128 MD
Verify on CMS → Uyen Ly, MD
Family Medicine Physician in Occidental, 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 150,125 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
589
Medicare Part D claims · 379 beneficiaries · Family Medicine Physician avg: 4K
What the federal data shows
Uyen Ly, MD filed 589 Medicare Part D claims in 2024 as a Family Medicine Physician in Occidental, California.
- 589
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥65th
- 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 Uyen Ly, MD
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 1700889128), first enumerated 05/31/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 589 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
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Uyen Ly, MD'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 1700889128 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1700889128
- ENUM-LEGACY 2005
- TAX-MEGA 150K Family Medicine
- RX-LIGHT 589
- BOOK-MID 16,272 in California
- PHOTO-ENUM David Flynn · 2005
Uyen Ly, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
589 ≥ 65th percentile 65% of 1,416,883 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 · 2024
✓
Board certification likely (heuristic, not verified)
Uyen Ly, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Uyen Ly, MD?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
589 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 | 1700889128 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 05/31/2005 |
Hospital and facility affiliations
Facilities where Uyen Ly, MD 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.
Permanente Medical Group Inc
Santa Rosa, CA
Santa Rosa Community Health Centers
Santa Rosa, 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 Uyen Ly, MD. To verify Uyen Ly, MD'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.
589
Total Claims
$36K
Total Drug Cost
379
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,186.133
- Total Day Supply
- 32,443
- Generic Drug Cost
- $11K
- Opioid Claims
- 36 (6.1% rate)
- Antibiotic Claims
- 37
Patient Demographics
- Average Patient Age
- 73.7 years
- Avg HCC Risk Score
- 1.15
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 21, 65-74: 191, 75-84: 132, 85+: 35
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Uyen Ly, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Albuterol Sulfate …
Albuterol Sulfate Hfa
36 claims
- Fluticasone Propio…
Fluticasone Propionate
34 claims
- Lisinopril
Lisinopril
31 claims
- Losartan Potassium
Losartan Potassium
20 claims
- Atorvastatin Calcium
Atorvastatin Calcium
19 claims
- Levothyroxine Sodium
Levothyroxine Sodium
19 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
18 claims
- Amlodipine Besylate 14
Amlodipine Besylate
14 claims
| Drug | Claims |
|---|---|
| Albuterol Sulfate Hfa Albuterol Sulfate | 36 |
| Fluticasone Propionate | 34 |
| Lisinopril | 31 |
| Losartan Potassium | 20 |
| Atorvastatin Calcium | 19 |
| Levothyroxine Sodium | 19 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 18 |
| Amlodipine Besylate | 14 |
| Prednisone | 13 |
| Alendronate Sodium | 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 Uyen Ly, MD fits within the Family Medicine Physician landscape nationally.
150,125
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,519
Avg Claims per Provider
Uyen Ly, MD's 589 claims are below the specialty average of 3,519.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Ly, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
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 Ly.
One of 16,272 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. Vanessa Abarca
DO
Ventura, CA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Uyen Ly, MD's specialty? ▼
Uyen Ly, MD specializes in Family Medicine Physician and practices in Occidental, California. Credentials: MD.
How much does Uyen Ly, MD prescribe under Medicare Part D? ▼
In 2024, Uyen Ly, MD wrote 589 Medicare Part D claims totaling $36K in drug costs for 379 beneficiaries.
Where is Uyen Ly, MD located? ▼
Uyen Ly, MD is located at 3802 MAIN STREET, Occidental, CA, 95465. Phone: (707) 874-2444.
What is Uyen Ly, MD's NPI number? ▼
Uyen Ly, MD's National Provider Identifier (NPI) is 1700889128, issued on 05/31/2005.
Does Uyen Ly, MD prescribe opioids? ▼
Yes, Uyen Ly, MD had 36 opioid claims in 2024 with an opioid prescribing rate of 6.1%.
How many Family Medicine Physician providers are there in the US? ▼
There are 150,125 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,519 Medicare Part D claims per year.
What drugs does Uyen Ly, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Uyen Ly, MD's most frequently prescribed drugs include Albuterol Sulfate Hfa, Fluticasone Propionate, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Uyen Ly, MD accept Medicare? ▼
Uyen Ly, MD appears in CMS Medicare data with 589 Part D claims and 379 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Uyen Ly, MD's credentials? ▼
Uyen Ly, MD's NPI is 1700889128 with credentials MD. 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.
- 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
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.