Dr. Theodore Thien Nguyen, MD
- Medicare services, 2024
- 455
- Medicare patients, 2024
- 173
- Part D claims, 2024
- 310
- MIPS score, 2024
- 89
- Hospital affiliations
- 1
- Practice address
- 11234 Anderson St, Loma Linda, CA 92354
- Practice phone
- Call (909) 558-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nguyen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Theodore Thien Nguyen is an internist in Loma Linda, California
Dr. Nguyen practices at Loma Linda University Medical Center in Loma Linda, California, part of Seventh-day Adventist Church.
Dr. Nguyen's NPI, 1104484781, was assigned on May 30, 2019. Dr. Nguyen graduated from Loma Linda University School Of Medicine in 2019. Dr. Nguyen holds California license A178744.
- NPI
- 1104484781NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9436537784
- NPI enumeration date
- May 30, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (909) 558-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Theodore Thien Nguyen practices at Loma Linda University Medical Center in Loma Linda, California
Dr. Nguyen's primary practice is Loma Linda University Medical Center, at 11234 Anderson St, Loma Linda, CA 92354 in San Bernardino County. The practice phone is (909) 558-4000.
- Loma Linda University Medical Center11234 Anderson St, Loma Linda, CA 92354 · San Bernardino CountyPhone(909) 558-4000
Source: Dmand AI Affiliation Data
Dr. Theodore Thien Nguyen is affiliated with 1 site of care and 1 medical group
Dr. Nguyen's primary practice is Loma Linda University Medical Center in Loma Linda, California, part of Seventh-day Adventist Church. The medical group on file is Loma Linda University Faculty Medical Group (LLUFMG).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Theodore Thien Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nguyen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Loma Linda University Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Seventh-day Adventist Church and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Theodore Thien Nguyen is one of 16,751 internists in California
Internal medicine is Dr. Nguyen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Nguyen is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acute respiratory failure, anemia, cellulitis, congestive heart failure, electrolyte disorders, gastrointestinal inflammation, kidney stones and lung disease: COPD, asthma or bronchitis among the conditions Dr. Nguyen treats.
Internists near Dr. Nguyen
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Theodore Thien Nguyen billed Medicare for 455 services in 2024
CMS data shows 455 Medicare services from Dr. Nguyen across 5 procedure codes in 2024, for 173 Medicare patients. Medicare paid $33,922 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Nguyen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3912024: 45516%
Dr. Nguyen compared with the California median for internists, 2024
- Dr. Nguyen
- California median
- Medicare services
- 455vs 36126% above
- Medicare patients
- 173vs 15115% above
- Part D claims
- 120vs 42171% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Nguyen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Nguyen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nguyen and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Theodore Thien Nguyen treated 173 Medicare patients in 2024, average age 71
CMS counts 173 Medicare patients who saw Dr. Nguyen in 2024. The largest group is 65 to 74, with 73 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 55% are also on Medicaid. Their average risk score is 3.29, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Nguyen's median patient age at 64, with 55% women.
Dr. Nguyen's Medicare patients by age, 2024
Dr. Nguyen's Medicare patients by sex, 2024
- Women8449%
- Men8951%
Chronic conditions among Dr. Nguyen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Heart failure51%
- Chronic kidney disease50%
- Diabetes50%
- Ischemic heart disease41%
- Stroke or TIA40%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nguyen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Theodore Thien Nguyen wrote 310 Medicare Part D claims in 2024
In 2024, Dr. Nguyen wrote 310 Medicare Part D claims for 100 patients. 94% of them were for generic drugs. CMS names the drug for 120 of them, across 7 drugs with 11 or more claims each, at $2,138 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Dr. Nguyen's Part D claims by kind of drug, 2024
- Generic292 claims94%
- Brand-name and other18 claims6%
Dr. Nguyen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Nguyen's Part D claims, 2024
- Opioids16%49 of 310 claims
- Antibiotics10%32 of 310 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 122024: 120900%
Drugs named by CMS: 7 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Theodore Thien Nguyen scored 89 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Dr. Nguyen for performance year 2024, reported as part of a group. Dr. Nguyen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Nguyen's MIPS scores, performance year 2024
- 89of 100Final score
- 72.1of 100Quality
- 80of 100Promoting Interoperability
- 40of 100Improvement Activities
- 77of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Theodore Thien Nguyen received $76 in industry payments from 2022 to 2025
CMS Open Payments shows 3 general payments to Dr. Nguyen from 3 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Astellas Pharma US Inc paid the most, $33.
General payments to Dr. Nguyen by program year, 2022 to 2025
Companies that paid Dr. Nguyen the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Theodore Thien Nguyen graduated from Loma Linda University School Of Medicine
Dr. Nguyen graduated from Loma Linda University School Of Medicine in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Theodore Thien Nguyen accepts plans from 7 insurance carriers
Dr. Nguyen is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
Plan types Dr. Nguyen accepts, by number of carriers
- Medicare7
- PPO5
- HMO3
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Theodore Thien Nguyen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Theodore Thien Nguyen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Theodore Thien Nguyen's NPI number?
Dr. Theodore Thien Nguyen's NPI number is 1104484781. It was assigned on May 30, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Theodore Thien Nguyen?
Dr. Theodore Thien Nguyen is an internist in Loma Linda, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Theodore Thien Nguyen practice?
Dr. Nguyen practices at 11234 Anderson St, Loma Linda, CA 92354. Dr. Nguyen's primary practice is Loma Linda University Medical Center in Loma Linda, California, part of Seventh-day Adventist Church.
What is Dr. Theodore Thien Nguyen's office phone number?
The practice phone on file for Dr. Nguyen is (909) 558-4000.
What is Dr. Theodore Thien Nguyen's medical license number?
Dr. Nguyen holds California license A178744.
Which hospitals is Dr. Theodore Thien Nguyen affiliated with?
Dr. Nguyen practices at Loma Linda University Medical Center in Loma Linda, California.
What medical group is Dr. Theodore Thien Nguyen part of?
Dr. Nguyen is linked to Loma Linda University Faculty Medical Group (LLUFMG).
Does Dr. Theodore Thien Nguyen accept Medicare?
Yes. CMS data shows Dr. Nguyen billed Medicare for 455 services in 2024, and Dr. Nguyen accepts Medicare assignment.
What is Dr. Theodore Thien Nguyen's MIPS score?
Dr. Nguyen's MIPS final score for performance year 2024 is 89 out of 100, reported as part of a group.
How many Medicare patients does Dr. Theodore Thien Nguyen see?
CMS counts 173 Medicare patients who saw Dr. Nguyen in 2024, with an average age of 71.
Show 6 more questionsShow fewer questions
What services does Dr. Theodore Thien Nguyen bill to Medicare?
In 2024, Dr. Nguyen's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99239).
Where did Dr. Theodore Thien Nguyen go to medical school?
Dr. Nguyen graduated from Loma Linda University School Of Medicine in 2019.
What drugs does Dr. Theodore Thien Nguyen prescribe most?
In 2024 Medicare Part D data, Dr. Nguyen's most prescribed drugs by claims were Naloxone HCl, Hydrocodone-Acetaminophen and Oxycodone HCl.
Has Dr. Theodore Thien Nguyen received payments from drug or device companies?
CMS Open Payments shows $76 in general payments to Dr. Nguyen from 3 companies from 2022 to 2025. The largest total came from Astellas Pharma US Inc.
How long has Dr. Theodore Thien Nguyen been practicing?
Dr. Nguyen graduated from medical school in 2019, 7 years ago.
What insurance does Dr. Theodore Thien Nguyen accept?
Dr. Nguyen is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card