Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Johnson Chong-Sein Kay

Individual provider Internal Medicine Physician · NPI 1184688061

Dr. Johnson Chong-Sein Kay practises Rheumatology in Las Vegas, Nevada. Qualified in 2005, 21 years ago. Practices with Optum Medical Group II Rhodes P C, a 302-clinician group and accepts Medicare assignment. Licensed in California and Nevada.

Years since qualifying
21
Licensed in
CA, NV
In the registry since
2006
Specialties on file
4
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Practice location Address checks out

4475 S Eastern Ave Ste 2400
Las Vegas, NV 89119-7826
Phone: (702) 954-7672
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence DO 1995 (NV)
Internal Medicine Physician Taxonomy 207R00000X · Licence 20A 9805 (CA)
Rheumatology Physician Taxonomy 207RR0500X · Licence 20A 9805 (CA)
Hospitalist Physician Taxonomy 208M00000X · Licence 20A 9805 (CA)

Record details

NPI number1184688061
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedApril 17, 2006
Last updated in NPPESJuly 29, 2022
Certification dateJuly 29, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRHEUMATOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Optum Medical Group Ii Rhodes P C — 302 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients96
Services billed 202 a service is one billed item, such as a visit, a test or a procedure
Average patient age67

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $157 7 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Optum Medical Group II Rhodes P C

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 302 clinicians in the practice; 12 are shown here.

Other providers in Las Vegas