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Edit this profileAt a glance
- 1310 San Bernardino Rd, Suite 207, Upland, CA 91786
About Dr. Nguyen
Based in Upland, CA, Tan K. Nguyen, M.D. is listed in the NPI registry under internal medicine. Tan is also listed as specializing in dermatology and mohs surgery / dermatologic surgery. Medicare claims data shows Tan provided 30,647 services to 1,095 patients. The services billed most often include aminolevulinic acid hcl for topical administration, 10% gel, 10 mg, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and destruction of precancer skin growth, 2-14 growths. NPI 1144273491 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (909) 946-8600
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
1310 SAN BERNARDINO RD SUITE 207
Upland, CA 91786
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Cancer Prevention
Cancer risk
Environmental health
- Asbestos Exposure
- Contaminated drinking water exposure
- Heat exhaustion and heat stroke
- Radon gas exposure
- Tick bite and Lyme disease risk
- Toxic Mold Exposure
- Wildfire smoke and air pollution exposure
- Workplace Chemical Exposure
General wellness
Heart health
Infectious Disease
Infectious disease
Kidney health
Lifestyle & wellness
Lifestyle health
Longevity
Metabolic & Lifestyle
Occupational health
Occupational Health
Rashes & allergy
Sexual Health
Sexual health
Substance use
Travel health
Wellness and energy
Workplace health
Most searched conditions
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Addiction & habits
Cancer screening
Cancer Screening
Checkups & exams
Chronic illness
Diagnostics & screening
Environmental health
Fitness & body composition
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart & circulation
Heart health
Hospital-based procedures
Imaging referral
Immunizations
Infection & Microbiology Tests
Lifestyle & Prevention
Longevity
Lower endoscopy
Lungs & Breathing
Metabolic & Weight
Metabolic health
Occupational health
Occupational Health
Office Procedures
Preventive and evaluation
- Preoperative medical clearance
- Medication management
- Post-hospital transitional care
Preventive imaging
Preventive screening
Routine Blood Tests
Screening & labs
Screening and diagnostic testing
- Blood pressure screening
- Cancer screening and prevention planning
- Diabetes and prediabetes screening
- EKG
- Spirometry
Screenings & Diagnostics
Travel Health
Travel medicine
Wellness
Wellness & Screening
Workplace health
Skin growths
Sleep
Most searched procedures
Bones & Joints
Brain and nerves
Digestive
Exams & Consultations
Lab tests
Minor procedures
Office procedures
Pain management
Preventive & Routine Care
Sexual health
Procedures Most Often Billed to Medicare
30,647 services · 1,095 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Destruction of precancer skin growth, 2-14 growths | Procedure | 17003 |
889 | As often as other peers in Internal Medicine |
| Destruction of skin growth, 1-14 growths | Procedure | 17110 |
236 | More often than most peers in Internal Medicine |
| Destruction of precancer skin growth, 1 growth | Procedure | 17000 |
194 | As often as other peers in Internal Medicine |
| Injection into skin growth, more than 7 growths | Procedure | 11901 |
62 | Too few peers to compare |
| Injection into skin growth, 1-7 growths | Procedure | 11900 |
45 | More often than most peers in Internal Medicine |
| Shaving of skin growth of body, arms, or legs, 1.1-2.0 cm | Procedure | 11302 |
36 | As often as other peers in Internal Medicine |
| Complicated repair of wound of trunk, 2.6-7.5 cm | Procedure | 13101 |
27 | Less often than most peers in Internal Medicine |
| Destruction of precancer skin growth, 15 or more growths | Procedure | 17004 |
26 | Less often than most peers in Internal Medicine |
| Complicated repair of wound of scalp, arms, or legs, 2.6-7.5 cm | Procedure | 13121 |
26 | Less often than most peers in Internal Medicine |
| Destruction of skin growth, 15 or more growths | Procedure | 17111 |
24 | Less often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other internists in Upland 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1991 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Destruction of precancer skin growth, 2-14 growths 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Tan K. Nguyen's specialty?
Tan K. Nguyen is an internist in Upland, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where can I find Tan K. Nguyen?
Tan K. Nguyen is listed at 1310 San Bernardino Rd Suite 207, Upland, CA 91786. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Tan K. Nguyen?
The number on file is (909) 946-8600. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Tan K. Nguyen?
Tan K. Nguyen's National Provider Identifier is 1144273491. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Tan K. Nguyen's education?
Tan K. Nguyen attended Other, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Tan K. Nguyen have?
Tan K. Nguyen has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What is Tan K. Nguyen known for?
According to Medicare billing data, Tan K. Nguyen performs procedures including destruction of precancer skin growth, 2-14 growths, destruction of skin growth, 1-14 growths and destruction of precancer skin growth, 1 growth; reads or performs imaging such as superficial and/or low voltage radiation treatment delivery and obtaining data needed to develop the optimal radiation treatment, 1 treatment area; provides treatments such as injection of drug or substance under skin or into muscle and therapy procedure using ultrasound, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Tan K. Nguyen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Tan K. Nguyen. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.