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Edit this profileAt a glance
- 5030 Westminster Ave, Santa Ana, CA 92703
About Dr. Nguyen
Theresa Thanh N. Nguyen, M.D. is a healthcare provider in Santa Ana, CA specializing in internal medicine. Theresa Thanh trained at University of California, San Diego School of Medicine, graduating in 1995. Medicare claims data shows Theresa Thanh provided 3,636 services to 1,770 patients. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, insertion of needle into vein for collection of blood sample, and chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month. This provider record is associated with NPI 1003893801.
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
- (714) 775-8090
- Email not available
Practice Locations
5030 WESTMINSTER AVE
Santa Ana, CA 92703
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
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
- Anemia
Brain & Nerves
Brain and nerves
- Vertigo
Cardiac and vascular
Digestive
Heart & Circulation
- Heart disease
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive and evaluation
- Medication management
- Post-hospital transitional care
Screening and diagnostic testing
- EKG
- Spirometry
Bones & Joints
Brain and nerves
Cancer screening
- Colon Cancer Screening Referral
- Mammogram Referral
Digestive
Exams & Consultations
- Pre-Op Clearance Exam
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart health
- Cardiac Stress Test Referral
Imaging referral
- Abdominal Ultrasound Referral
Immunizations
Lab tests
- Urinalysis
Lungs & Breathing
- At-Home Sleep Study Order
Metabolic & Weight
- Weight Loss Injections and Medication
Minor procedures
Office procedures
Office Procedures
- Skin Tag and Mole Removal
- Vitamin B12 Injections
- Wart Removal
Pain management
Preventive & Routine Care
Screenings & Diagnostics
- Bone Density Scan Referral
- Diabetes Screening and A1C Test
Sexual health
- STI Testing
Procedures Most Often Billed to Medicare
3,636 services · 1,770 patients · 12 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
715 | More than most peers in Internal Medicine |
| Influenza vaccine, trivalent derived from cell cultures | Treatment | 90661 |
204 | More than most peers in Internal Medicine |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
35 | Less often than most peers in Internal Medicine |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
28 | As often as other peers in Internal Medicine |
| Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | Treatment | 90677 |
25 | As often as other peers in Internal Medicine |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
1,498 | More than most peers in Internal Medicine |
| Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | Office visit | 99490 |
504 | More often than most peers in Internal Medicine |
| Administration of influenza virus vaccine | Billing code | G0008 |
206 | More than most peers in Internal Medicine |
| Advance care planning, first 30 minutes | Office visit | 99497 |
187 | More often than most peers in Internal Medicine |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | Billing code | G0439 |
185 | More 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.
Other internists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 1
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 32 related providers in 4 groups
Other internists in Santa Ana 8
Same specialty, same city.
Trained at University of California, San Diego School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1995 at University of California, San Diego School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Theresa Thanh N. Nguyen's specialty?
Theresa Thanh N. Nguyen is an internist in Santa Ana, 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 Theresa Thanh N. Nguyen?
Theresa Thanh N. Nguyen is listed at 5030 Westminster Ave, Santa Ana, CA 92703. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Theresa Thanh N. Nguyen?
The number on file is (714) 775-8090. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Theresa Thanh N. Nguyen?
Theresa Thanh N. Nguyen's National Provider Identifier is 1003893801. 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 Theresa Thanh N. Nguyen's education?
Theresa Thanh N. Nguyen attended University of California, San Diego School of Medicine, graduating in 1995. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Theresa Thanh N. Nguyen have?
Theresa Thanh N. Nguyen has 31 years experience. Calculated from a graduation year of 1995, reported in the CMS National Downloadable File.
CMS public data
What is Theresa Thanh N. Nguyen known for?
According to Medicare billing data, Theresa Thanh N. Nguyen performs procedures including insertion of needle into vein for collection of blood sample; provides treatments such as influenza vaccine, trivalent derived from cell cultures and injection of drug or substance under skin or into muscle, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Theresa Thanh N. Nguyen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Theresa Thanh N. Nguyen. If this is you, claiming it is free.
Guide.md
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