Medicare Enrolled
Dr. Stephen Nguyen, MD
Internal Medicine · Sun City, CA
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Nguyen from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Nguyen
Dr. Stephen Nguyen is an internal medicine specialist in Sun City, CA, with 21 years of NPI registration. Based on federal Medicare data, Dr. Nguyen performed 9,403 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Nguyen received a total of $7,278 from 48 pharmaceutical and/or device companies across 351 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Nguyen is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 21 years of NPI registration
▲ Top 3% volume in CA
$7,278 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗9,403
Medicare services
Top 3% in CA for internal medicine
Not available
Unique patients (not deduplicated)
$46
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
1,113 | $70 | $140 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
1,112 | $94 | $225 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
575 | $71 | $175 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
570 | $8 | $25 |
| Lipid panel (cholesterol and triglycerides) A blood test that measures cholesterol and triglyceride levels. |
387 | $13 | $75 |
| Annual wellness visit, follow-up A follow-up annual wellness visit that includes a personalized prevention plan of service. |
352 | $140 | $150 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
346 | $16 | $75 |
| Hemoglobin A1c test (diabetes monitoring) A blood test that measures your average blood sugar levels over the past two to three months. |
341 | $10 | $65 |
| Vitamin D level test A blood test to measure the amount of Vitamin D-3 in your body. |
307 | $29 | $70 |
| Annual intensive behavioral therapy for cardiovascular disease, 15 minutes A yearly, in-person session focused on intensive behavioral therapy to help manage cardiovascular disease. The session lasts for 15 minutes and is conducted with the patient individually. |
297 | $27 | $45 |
| Annual depression screening | 295 | $21 | $75 |
| Electrocardiogram (EKG), 12-lead A standard heart rhythm test using at least 12 leads to record electrical activity. A healthcare provider interprets the results and provides a written report. |
278 | $11 | $115 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
234 | $10 | $75 |
| Urinalysis with microscopic exam A urine test performed manually that includes examining the sample under a microscope to check for abnormalities. |
233 | $3 | $35 |
| Basic metabolic blood panel A blood test that measures a group of basic chemicals, including total calcium levels. |
224 | $8 | $55 |
| Free thyroxine (T4) test A blood test that measures the level of free thyroxine, a thyroid hormone, in the bloodstream. |
203 | $9 | $55 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
193 | $8 | $45 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
190 | $15 | $65 |
| Liver function blood test panel | 184 | $8 | $60 |
| Free T3 thyroid hormone test A blood test that measures the level of free triiodothyronine (T3) hormone in your body. This helps assess how well your thyroid gland is functioning. |
181 | $17 | $60 |
| PSA test (prostate cancer screening) | 164 | $18 | $95 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
156 | $33 | $35 |
| Flu vaccine, quadrivalent A flu shot containing four strains of the influenza virus to help prevent seasonal influenza infection. |
153 | $74 | $83 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
120 | $110 | $448 |
| Automated urinalysis An automated laboratory test performed on a urine sample to analyze its chemical and physical properties. The procedure uses machinery to detect various substances and cells within the urine. |
94 | $2 | $25 |
| Urine microalbumin test (kidney screening) A laboratory test that measures the amount of microalbumin, a small protein, in a urine sample. This test is used to detect early signs of kidney damage. |
90 | $6 | $55 |
| Creatinine test (kidney function) A blood test that measures the amount of creatinine to assess kidney function or detect muscle injury. |
89 | $5 | $35 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
81 | $12 | $35 |
| Advance care planning consultation, first 30 min A session focused on discussing and documenting future healthcare preferences and goals. This service covers the initial 30 minutes of the planning discussion. |
80 | $84 | $300 |
| Bone density scan (DEXA) A test that uses low-dose X-rays to measure bone mineral density in the hip, pelvis, and spine. It helps assess bone strength and risk of fractures. |
65 | $44 | $238 |
| Sed rate test (inflammation marker) This automated test measures how quickly red blood cells settle in a tube to detect inflammation in the body. |
54 | $3 | $35 |
| Assessment of and care planning for patient with impaired thought processing, typically 60 minutes | 51 | $233 | $350 |
| Pneumonia vaccine administration This procedure involves the injection of a vaccine to protect against pneumococcal disease. It is administered by a healthcare provider. |
51 | $33 | $45 |
| Neuropsychological test evaluation, first hour A professional assessment of cognitive and behavioral functioning using standardized tests. This service covers the initial hour of the evaluation process. |
47 | $105 | $175 |
| Uric acid level test A blood test that measures the level of uric acid in your body. Uric acid is a waste product formed when the body breaks down purines. |
44 | $4 | $40 |
| Sex hormone binding globulin level test A blood test that measures the level of sex hormone binding globulin, a protein that binds to sex hormones in the bloodstream. |
43 | $21 | $60 |
| Total testosterone level test A blood test that measures the total amount of testosterone in your body. This hormone is important for various bodily functions in both men and women. |
43 | $25 | $50 |
| New patient office visit, complex (60-74 min) | 43 | $166 | $490 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
36 | $114 | $300 |
| Pneumococcal vaccine, 23-valent A vaccine that protects against 23 types of pneumococcal bacteria. It is used to prevent infections caused by these bacteria. |
35 | $131 | $150 |
| Iron level test | 32 | $6 | $40 |
| Iron binding capacity test A blood test that measures the amount of iron in the blood and the blood's ability to bind and transport iron. |
32 | $9 | $40 |
| Home health plan of care certification Certification by a physician or allowed practitioner for Medicare-covered home health services under a home health plan of care. This includes contacting the home health agency and reviewing reports of patient status required by physicians. |
28 | $46 | $122 |
| Transitional care management, high complexity Coordination of care for a patient transitioning from a short-term hospital stay or other facility to home or another care setting. This service addresses a high-complexity medical problem. |
25 | $232 | $325 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
23 | $13 | $60 |
| High-sensitivity C-reactive protein test A blood test that measures high-sensitivity C-reactive protein to detect infection or inflammation. |
22 | $13 | $55 |
| Ear wax removal A procedure to remove impacted ear wax from the ear canal. |
17 | $41 | $105 |
| Pneumococcal vaccine, 13-valent | 16 | $253 | $270 |
| Telephone medical discussion, 5-10 minutes A phone conversation with a physician lasting between 5 and 10 minutes to discuss medical matters. |
15 | $40 | $75 |
| Manual white blood cell count A laboratory test that involves examining a sample under a microscope to manually count the number of white blood cells present. |
13 | $4 | $35 |
| Complete blood count (CBC), automated An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood. |
13 | $6 | $40 |
| Lidocaine HCl injection for IV infusion, 10 mg Administration of a 10 mg dose of lidocaine hydrochloride via intravenous infusion. |
13 | $0 | $45 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. These counts do not measure clinical quality or years of experience.
0.1% high complexity
0.9% medium
99.0% routine
Industry Payment Transparency
Open Payments through 2024 ↗$7,278
Total received (2018-2024)
Avg $1,040/year across 7 years
Top 12% in CA for internal medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
48
Companies
351
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$858
2023
$491
2022
$588
2021
$1,285
2020
$455
2019
$1,205
2018
$2,396
Payments by company (2024)
Boehringer Ingelheim Pharmaceuticals, Inc.
$135
Amgen Inc.
$120
Novo Nordisk Inc
$91
Otsuka America Pharmaceutical, Inc.
$82
Esperion Therapeutics, Inc.
$60
AstraZeneca Pharmaceuticals LP
$52
Eisai Inc.
$51
Lilly USA, LLC
$49
Novartis Pharmaceuticals Corporation
$46
ABIOMED
$44
Actelion Pharmaceuticals US, Inc.
$24
E.R. Squibb & Sons, L.L.C.
$24
Bayer Healthcare Pharmaceuticals Inc.
$24
Abbott Laboratories
$22
ABBVIE INC.
$19
PFIZER INC.
$15
Top 3 companies account for 40.3% of 2024 payments
All-time payments by company (2018-2024) ›
Novo Nordisk Inc
$1,051
Janssen Pharmaceuticals, Inc
$637
Amarin Pharma Inc.
$575
Boehringer Ingelheim Pharmaceuticals, Inc.
$530
AstraZeneca Pharmaceuticals LP
$496
SANOFI-AVENTIS U.S. LLC
$434
Esperion Therapeutics, Inc.
$353
Novartis Pharmaceuticals Corporation
$302
Astellas Pharma US Inc
$280
Lilly USA, LLC
$273
Amgen Inc.
$273
PFIZER INC.
$217
Daiichi Sankyo Inc.
$180
Allergan Inc.
$149
Otsuka America Pharmaceutical, Inc.
$147
GlaxoSmithKline, LLC.
$109
Merck Sharp & Dohme Corporation
$106
AbbVie Inc.
$93
Kowa Pharmaceuticals America, Inc.
$79
ABBVIE INC.
$63
Avanir Pharmaceuticals, Inc.
$61
Sunovion Pharmaceuticals Inc.
$57
BIODELIVERY SCIENCES INTERNATIONAL, INC.
$52
Mannkind Corporation
$51
Eisai Inc.
$51
Sanofi Pasteur Inc.
$50
Abbott Laboratories
$49
Takeda Pharmaceuticals U.S.A., Inc.
$48
ABIOMED
$44
E.R. Squibb & Sons, L.L.C.
$42
Biogen, Inc.
$36
SANOFI PASTEUR INC.
$34
Purdue Pharma L.P.
$33
BioDelivery Sciences International, Inc.
$31
Allergan, Inc.
$31
Dexcom, Inc.
$29
Actelion Pharmaceuticals US, Inc.
$24
Bayer Healthcare Pharmaceuticals Inc.
$24
Biohaven Pharmaceutical Holding Company Ltd.
$23
Antares Pharma, Inc.
$22
Merck Sharp & Dohme LLC
$20
DEXCOM, INC.
$20
Scilex Pharmaceuticals Inc.
$18
Medtronic, Inc.
$17
Qiagen, LLC
$17
Almatica Pharma LLC
$17
Tactile Systems Technology Inc
$17
MannKind Corporation
$14
Top 3 companies account for 31.1% of all-time payments
Associated products mentioned in payments ›
ADUHELM · AFREZZA · ANORO · Aimovig · BAQSIMI · BELBUCA · BELSOMRA · BREZTRI · BUNAVAIL 2.1 mg 30-count box · BYSTOLIC · CHANTIX · DEXCOM G6 TRANSMITTER · Dexcom CGM · ELIQUIS · EMGALITY · ENTRESTO · EVENITY · Enhertu · FARXIGA · FLEXITOUCH · FLUZONE HIGH-DOSE · FREESTYLE LIBRE 3 · GRALISE · INVOKANA · Impella · InPen · JANUVIA · JARDIANCE · Kerendia · LEQVIO · LINZESS · LYRICA · LYUMJEV · Leqembi · Livalo · MDX QUANTIFERON · MITRACLIP · MOUNJARO · MYRBETRIQ · NEXLETOL · NEXLIZET · NOCDURNA · NUEDEXTA · NURTEC ODT · NovoLog · Nuedexta · OFEV · ONZETRA Xsail · OPSUMIT · Otezla · Ozempic · PREVNAR - 13 · PREVNAR 13 · REXULTI · RYBELSUS · Rybelsus · SOLIQUA 100/33 · SYMBICORT · SYMPROIC · SYNTHROID · Saxenda · TOUJEO · TRADJENTA · TRELEGY ELLIPTA · TRULICITY · Tresiba · Trintellix · UBRELVY · UTIBRON · VESICARE · VRAYLAR · Vascepa · Victoza · XARELTO · ZTLido 30 POUCH in 1 CARTON 1 PATCH in 1 POUCH
Should you be concerned? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Geographic Context
Internal medicine physicians in nearby ZIP areas
837
County median income
$89,672
Nearest hospital to ZIP centroid (approximate)
MENIFEE GLOBAL MEDICAL CENTER
3.1 mi
3.1 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Nguyen is a clinical cardiology specialist, with above-average Medicare volume (top 3% in CA), with 21 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Nguyen experienced with telephone medical discussion, 11-20 minutes?
Based on Medicare claims data, Dr. Nguyen performed 1,113 telephone medical discussion, 11-20 minutes services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Nguyen receive payments from pharmaceutical companies?
Yes. Dr. Nguyen received a total of $7,278 from 48 companies across 351 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Nguyen's costs compare to other internal medicine physicians in Sun City?
Dr. Nguyen's average Medicare payment per service is $46. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Nguyen) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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