NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1558362723 DO
Verify on CMS → Thuy Pham, DO
Internal Medicine Physician in Corona, 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 172,737 in Internal 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
6K
Medicare Part D claims · 863 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
80%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$111.29
3 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Thuy Pham, DO filed 5,890 Medicare Part D claims in 2023 as an Internal Medicine Physician in Corona, California, prescribing 80% generic.
- 6K
- Part D claims, 2023
- 80%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥95th
- 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.
Thuy Pham, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
5,890 ≥ 95th percentile 95% 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 certification likely (heuristic, not verified)
Thuy Pham, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 3 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 Thuy Pham, DO?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
5,890 117% vs specialty avg
Specialty distribution in California
How Internal 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 Internal 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).
Thuy Pham, DO appears in the CMS NPPES registry as an Internal Medicine Physician provider holding DO credentials at 1530 W 6TH ST STE 109, Corona, CA, 92882, with a listed phone of (855) 505-7457. NPI 1558362723 was issued on 08/09/2005.
Medicare Part D records for calendar year 2023 show 5,890 prescription claims written by this provider, covering 863 Medicare beneficiaries and totaling roughly $537K in drug spend, split 17% brand-name and 80% generic by claim count, with an opioid prescribing rate of 1.8%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1558362723 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 08/09/2005 |
Hospital and facility affiliations
Facilities where Thuy Pham, DO 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.
According to CMS billing records, Thuy Pham, DO is affiliated with 3 Medicare-billing facilities.
Alessandro Medical Professional Corporation
Moreno Valley, CA
Dr. Javier Rios, A Medical Corporation
Temecula, CA
Javier R Rios MD A Professional Corporation
Riverside, 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).
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 Thuy Pham, DO. Source: openpaymentsdata.cms.gov.
Total received
$111
Largest payer
ABIOMED
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 Thuy Pham, DO. To verify Thuy Pham, DO'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
Thuy Pham, DO - brand share 17.0%
Internal Medicine Physician average
17% brand-name claims vs 80% generic, on 5,890 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.
5,890
Total Claims
$537K
Total Drug Cost
863
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 11,861
- Total Day Supply
- 339,640
- Brand vs Generic
- 17% brand / 80% generic
- Brand Drug Cost
- $426K
- Generic Drug Cost
- $104K
- Opioid Claims
- 106 (1.8% rate)
- Antibiotic Claims
- 170
Patient Demographics
- Average Patient Age
- 71.2 years
- Avg HCC Risk Score
- 1.69
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 102, 65-74: 509, 75-84: 200, 85+: 52
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Thuy Pham, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
286 claims
- Lisinopril
Lisinopril
239 claims
- Alendronate Sodium
Alendronate Sodium
210 claims
- Amlodipine Besylate
Amlodipine Besylate
202 claims
- Pravastatin Sodium
Pravastatin Sodium
186 claims
- Omeprazole
Omeprazole
166 claims
- Diclofenac Sodium
Diclofenac Sodium
165 claims
- Metformin Hcl
Metformin Hcl
160 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 286 |
| Lisinopril | 239 |
| Alendronate Sodium | 210 |
| Amlodipine Besylate | 202 |
| Pravastatin Sodium | 186 |
| Omeprazole | 166 |
| Diclofenac Sodium | 165 |
| Metformin Hcl | 160 |
| Januvia Sitagliptin Phosphate | 151 |
| Ibuprofen | 150 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Thuy Pham, DO fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Thuy Pham, DO's 5,890 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Pham.
Dr. Jacob Aaron
MD
San Francisco, CA
Dr. Alistair Aaronson
MD
Stanford, CA
Dr. Jose Abad.
MD
Sacramento, CA
Dr. Donna Abare
MD
Oakland, CA
Marce Abare
Scotts Valley, CA
Compare Internal Medicine Physician 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 Internal Medicine Physician 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.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
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How insurance networks affect your costs
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Frequently Asked Questions
What is Thuy Pham, DO's specialty? ▼
Thuy Pham, DO specializes in Internal Medicine Physician and practices in Corona, California. Credentials: DO.
How much does Thuy Pham, DO prescribe under Medicare Part D? ▼
In 2023, Thuy Pham, DO wrote 5,890 Medicare Part D claims totaling $537K in drug costs for 863 beneficiaries.
Where is Thuy Pham, DO located? ▼
Thuy Pham, DO is located at 1530 W 6TH ST STE 109, Corona, CA, 92882. Phone: (855) 505-7457.
What is Thuy Pham, DO's NPI number? ▼
Thuy Pham, DO's National Provider Identifier (NPI) is 1558362723, issued on 08/09/2005.
Does Thuy Pham, DO prescribe more brand-name or generic drugs? ▼
Thuy Pham, DO's prescribing is 17% brand-name and 80% generic drugs by claim count, with $426K in brand drug costs.
Does Thuy Pham, DO prescribe opioids? ▼
Yes, Thuy Pham, DO had 106 opioid claims in 2023 with an opioid prescribing rate of 1.8%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Thuy Pham, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Thuy Pham, DO's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Alendronate Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Thuy Pham, DO accept Medicare? ▼
Thuy Pham, DO appears in CMS Medicare data with 5,890 Part D claims and 863 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Thuy Pham, DO's credentials? ▼
Thuy Pham, DO's NPI is 1558362723 with credentials DO. 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.