Dr. Stephen T. Nguyen, MD
- Medicare services, 2024
- 3,008
- Medicare patients, 2024
- 390
- Part D claims, 2024
- 10,056
- MIPS score, 2024
- 26
- Hospital affiliations
- 1
- Practice address
- 4 Professional Dr, Gaithersburg, MD 20879
- Practice phone
- Call (301) 974-9625
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Thien Long
Gaithersburg, Maryland
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. Stephen T. Nguyen is an internist in Gaithersburg, Maryland
Dr. Nguyen practices at Thien Long in Gaithersburg, Maryland.
Dr. Nguyen's NPI, 1265596050, was assigned on December 19, 2006. Dr. Nguyen holds Maryland license D0063163.
- NPI
- 1265596050NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3274564430
- NPI enumeration date
- December 19, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (301) 974-9625
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stephen T. Nguyen practices at Thien Long in Gaithersburg, Maryland
Dr. Nguyen's primary practice is Thien Long, at 4 Professional Dr, Gaithersburg, MD 20879 in Montgomery County. The practice phone is (301) 974-9625.
- Thien Long4 Professional Dr, Gaithersburg, MD 20879 · Montgomery CountyPhone(301) 974-9625
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Stephen T. Nguyen is affiliated with 6 sites of care and 1 medical group
Dr. Nguyen's primary practice is Thien Long in Gaithersburg, Maryland. Dr. Nguyen is also affiliated with Adventist HealthCare Shady Grove Medical Center. The medical group on file is Frederick Health Medical Group. Dmand AI also links Dr. Nguyen to 2 more home health agencies, 1 physician office and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Stephen T. Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nguyen practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Thien Long | Available with a free account |
| +5 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stephen T. Nguyen is one of 3,320 internists in Maryland
Internal medicine is Dr. Nguyen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Nguyen is licensed in Maryland.
Specialties and state licenses
- Internal medicine, MarylandPrimary
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. Stephen T. Nguyen billed Medicare for 3,008 services in 2024
CMS data shows 3,008 Medicare services from Dr. Nguyen across 12 procedure codes in 2024, for 390 Medicare patients. Medicare paid $171,115 for them.
Dr. Nguyen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,7402024: 1,92210%
- Surgery
- 2023: 6142024: 84638%
- Tests and treatments
- 2023: 2832024: 15645%
- Other services
- 2023: 882024: 845%
Where Dr. Nguyen's Medicare services took place, 2024
- In an office2,97899%
- In a facility301%
Dr. Nguyen compared with the Maryland median for internists, 2024
- Dr. Nguyen
- Maryland median
- Medicare services
- 3,008vs 6564.6 times
- Medicare patients
- 390vs 25155% above
- Part D claims
- 9,242vs 30929.9 times
Medians across 3,215 internists in Maryland 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephen T. Nguyen treated 390 Medicare patients in 2024, average age 74
CMS counts 390 Medicare patients who saw Dr. Nguyen in 2024. The largest group is 65 to 74, with 200 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 63% are also on Medicaid. Their average risk score is 0.91, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nguyen's median patient age at 62, with 52% women.
Dr. Nguyen's Medicare patients by age, 2024
Dr. Nguyen's Medicare patients by sex, 2024
- Women23661%
- Men15439%
Chronic conditions among Dr. Nguyen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes40%
- Arthritis27%
- Chronic kidney disease13%
- Ischemic heart disease13%
- Osteoporosis12%
- Anxiety8%
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 62
Patient panel by sex, all payers
- Women52%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Stephen T. Nguyen wrote 10,056 Medicare Part D claims in 2024
In 2024, Dr. Nguyen wrote 10,056 Medicare Part D claims for 462 patients. 87% of them were for generic drugs. CMS names the drug for 9,242 of them, across 142 drugs with 11 or more claims each, at $1,178,806 in total drug cost. In 2023, CMS named 8,181 claims across 131 drugs.
Dr. Nguyen's Part D claims by kind of drug, 2024
- Generic8,731 claims87%
- Brand-name1,268 claims13%
- Other57 claims1%
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
- Opioids1%137 of 10,056 claims
- Antibiotics4%364 of 10,056 claims
- Antipsychotics, patients 65 and over1%61 of 10,056 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: 8,1812024: 9,24213%
Drugs named by CMS: 142 in 2024, 131 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. Stephen T. Nguyen scored 26 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 26 out of 100 for Dr. Nguyen for performance year 2024, reported individually. Dr. Nguyen accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Nguyen as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Nguyen's MIPS scores, performance year 2024
- 26of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 85of 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
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Dr. Stephen T. Nguyen received $9,369 in industry payments from 2016 to 2025
CMS Open Payments shows 438 general payments to Dr. Nguyen from 27 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $2,280.
General payments to Dr. Nguyen by program year, 2016 to 2025
General payments to Dr. Nguyen by kind, 2016 to 2025
- Food and beverage$9,363100%
- Education$60%
Companies that paid Dr. Nguyen the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Stephen T. Nguyen's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Stephen T. 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. Stephen T. Nguyen's NPI number?
Dr. Stephen T. Nguyen's NPI number is 1265596050. It was assigned on December 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen T. Nguyen?
Dr. Stephen T. Nguyen is an internist in Gaithersburg, Maryland. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stephen T. Nguyen practice?
Dr. Nguyen practices at 4 Professional Dr, Gaithersburg, MD 20879. Dr. Nguyen's primary practice is Thien Long in Gaithersburg, Maryland. Dmand AI also links Dr. Nguyen to 2 home health agencies, 1 physician office and 1 group practice or clinic.
What is Dr. Stephen T. Nguyen's office phone number?
The practice phone on file for Dr. Nguyen is (301) 974-9625.
What is Dr. Stephen T. Nguyen's medical license number?
Dr. Nguyen holds Maryland license D0063163.
Which hospitals is Dr. Stephen T. Nguyen affiliated with?
Dr. Nguyen is affiliated with Adventist HealthCare Shady Grove Medical Center.
What medical group is Dr. Stephen T. Nguyen part of?
Dr. Nguyen is linked to Frederick Health Medical Group.
Does Dr. Stephen T. Nguyen accept Medicare?
Yes. CMS data shows Dr. Nguyen billed Medicare for 3,008 services in 2024, and Dr. Nguyen accepts Medicare assignment.
Does Dr. Stephen T. Nguyen offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Nguyen as offering telehealth services.
What is Dr. Stephen T. Nguyen's MIPS score?
Dr. Nguyen's MIPS final score for performance year 2024 is 26 out of 100, reported individually.
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How many Medicare patients does Dr. Stephen T. Nguyen see?
CMS counts 390 Medicare patients who saw Dr. Nguyen in 2024, with an average age of 74.
What services does Dr. Stephen T. Nguyen bill to Medicare?
In 2024, Dr. Nguyen's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and office visit, established patient (99213).
What drugs does Dr. Stephen T. Nguyen prescribe most?
In 2024 Medicare Part D data, Dr. Nguyen's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. Stephen T. Nguyen received payments from drug or device companies?
CMS Open Payments shows $9,369 in general payments to Dr. Nguyen from 27 companies from 2016 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Stephen T. Nguyen been practicing?
Dr. Nguyen graduated from medical school in 2001, 25 years ago.
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