NPI registry status
Active
2026 NPPES data Sleep Medicine (Family Medicine) Physician NPI 1245855949 DO
Verify on CMS → Thien Nguyen, DO
Sleep Medicine (Family Medicine) Physician in Torrance, 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 214 in Sleep Medicine (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
125
Medicare Part D claims · 19 beneficiaries · Sleep Medicine (Family Medicine) Physician avg: 2K
Industry payments
$567.26
2 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Thien Nguyen, DO filed 125 Medicare Part D claims in 2024 as a Sleep Medicine (Family Medicine) Physician in Torrance, California.
- 125
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥34th
- 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 Thien Nguyen, DO
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 1245855949), first enumerated 06/09/2020.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 125 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
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$567.26 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Thien Nguyen, DO'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 1245855949 · Sleep Medicine (Family Medicine) Physician
NPI-10 · ENUM-RECENT · TAX-TRACE · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1245855949
- ENUM-RECENT 2020
- TAX-TRACE 214
- RX-LIGHT 125
- BOOK-THIN 28 in California
- PHOTO-ENUM Jennifer Hruska, MD,… · 2020
Thien Nguyen, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
125 ≥ 34th percentile 34% 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)
Thien Nguyen, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Thien Nguyen, DO?
Quality data not reportedPrimary specialty
Sleep Medicine (Family Medicine) Physician
Medicare Part D claims
125 92% vs specialty avg
Specialty distribution in California
How Sleep Medicine (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 Sleep Medicine (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 | 1245855949 |
|---|---|
| Specialty | Sleep Medicine (Family Medicine) Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 06/09/2020 |
Hospital and facility affiliations
Facilities where Thien Nguyen, 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.
The Regents OF The University OF California
Los Angeles, 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 Thien Nguyen, DO. Source: openpaymentsdata.cms.gov.
Total received
$567
Largest payer
Inspire Medical Systems, 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 Thien Nguyen, DO. To verify Thien Nguyen, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
125
Total Claims
$6K
Total Drug Cost
19
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 129.133
- Total Day Supply
- 3,755
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 75.2 years
- Avg HCC Risk Score
- 2.13
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Thien Nguyen, DO prescribes most
Top Medicare Part D drugs by claim count, 2024
- Tamsulosin Hcl
Tamsulosin Hcl
15 claims
- Potassium Chloride
Potassium Chloride
13 claims
- Finasteride
Finasteride
12 claims
- Fluoxetine Hcl
Fluoxetine Hcl
12 claims
- Benztropine Mesylate
Benztropine Mesylate
11 claims
- Lisinopril
Lisinopril
11 claims
- Solifenacin Succin…
Solifenacin Succinate
11 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 15 |
| Potassium Chloride | 13 |
| Finasteride | 12 |
| Fluoxetine Hcl | 12 |
| Benztropine Mesylate | 11 |
| Lisinopril | 11 |
| Solifenacin Succinate | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Sleep Medicine (Family Medicine) Physician in CA →
All providers in California →
Compare specialties →
Sleep Medicine (Family Medicine) Physician Overview
How Thien Nguyen, DO fits within the Sleep Medicine (Family Medicine) Physician landscape nationally.
214
Sleep Medicine (Family Medicine) Physician Providers in US
44
States with Sleep Medicine (Family Medicine) Physician
1,521
Avg Claims per Provider
Thien Nguyen, DO's 125 claims are below the specialty average of 1,521.
Nationwide Sleep Medicine (Family Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Nguyen, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2020)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Sleep Medicine (Family Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.
One of 28 Sleep Medicine (Family Medicine) Physician providers enrolled in California, 5 are shown here.
Dr. Saqib Ansari
MD
Capitola, CA
Noemi Arroyo Arroyo
Fontana, CA
Dr. Dana Awad
MD
Fontana, CA
Dr. Meneena Bright
MD
Newport Beach, CA
Nhi Bui
Redwood City, CA
Compare Sleep Medicine (Family Medicine) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Thien Nguyen, DO's specialty? ▼
Thien Nguyen, DO specializes in Sleep Medicine (Family Medicine) Physician and practices in Torrance, California. Credentials: DO.
How much does Thien Nguyen, DO prescribe under Medicare Part D? ▼
In 2024, Thien Nguyen, DO wrote 125 Medicare Part D claims totaling $6K in drug costs for 19 beneficiaries.
Where is Thien Nguyen, DO located? ▼
Thien Nguyen, DO is located at 3701 SKYPARK DR STE 200, Torrance, CA, 90505. Phone: (310) 378-8900.
What is Thien Nguyen, DO's NPI number? ▼
Thien Nguyen, DO's National Provider Identifier (NPI) is 1245855949, issued on 06/09/2020.
How many Sleep Medicine (Family Medicine) Physician providers are there in the US? ▼
There are 214 Sleep Medicine (Family Medicine) Physician providers across 44 states in the US. The average Sleep Medicine (Family Medicine) Physician provider writes 1,521 Medicare Part D claims per year.
What drugs does Thien Nguyen, DO prescribe most often? ▼
Based on 2024 Medicare Part D data, Thien Nguyen, DO's most frequently prescribed drugs include Tamsulosin Hcl, Potassium Chloride, Finasteride. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Thien Nguyen, DO accept Medicare? ▼
Thien Nguyen, DO appears in CMS Medicare data with 125 Part D claims and 19 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Thien Nguyen, DO's credentials? ▼
Thien Nguyen, DO's NPI is 1245855949 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 (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.