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DR. JOHNSON CHONG-SEIN KAY
NPI 1184688061
Internal Medicine - Rheumatology in Las Vegas, NV

Active since April 17, 2006PECOS EnrolledAccepts Medicare Assignment
4475 S EASTERN AVE STE 2400, LAS VEGAS, NV 89119(702) 954-7672 Get Directions Write a Review

NPPES record last updated: July 29, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 29, 2022, May 28, 2020, Jul 13, 2016 (3 updates tracked since 2016).

About Dr. Johnson Chong-sein Kay NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JOHNSON CHONG-SEIN KAY (NPI 1184688061) is an individual rheumatology provider in Las Vegas, Nevada, licensed in Nevada (DO 1995) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS and is a graduate of Other (2005).

NPPES Registry Identity

NPI1184688061
Entity TypeIndividualMale
Primary Taxonomy207RR0500X
Provider Legal NameDR. JOHNSON CHONG-SEIN KAY
Location Address4475 S EASTERN AVE STE 2400Las Vegas, NV 89119-7826
Mailing Address3016 W Charleston Blvd Ste 100Las Vegas, NV 89102-1973 · (702) 780-7118 · Fax (702) 671-6430
Phone(702) 954-7672
Sole ProprietorNo
Medical School CMSOtherGraduated 2005
Enumeration DateApril 17, 2006
Last NPPES UpdateJuly 29, 20223 updates tracked since enumeration
NPPES CertifiedJuly 29, 2022
✔ NPI 1184688061 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · RheumatologyAllopathic & Osteopathic Physicians
Taxonomy Code207RR0500X
Licenses✔ Licensed in NV · DO 1995✔ Licensed in CA · 20A 9805
Definition
An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.
Also ListedInternal MedicineTaxonomy 207R00000X · License 20A 9805 (CA)
Also ListedHospitalistTaxonomy 208M00000X · License 20A 9805 (CA)
4475 S EASTERN AVE STE 2400, Las Vegas, NV 89119
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Johnson Chong-sein Kay is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4183938475
PECOS Enrollment IDI20160906002389
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Johnson Kay reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Optum Medical Group II Rhodes P C
10 mi
Internal Medicine
2704 N TENAYA WAY
Las Vegas, NV 89128
  • Reassigned Medicare billing, Nevada enrollment
  • 608 clinicians in this Medicare group
NPI 1790329407 (702) 877-5199

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
77 services55 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
43 services40 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
18 services18 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
16 services16 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 89119 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$131.25 typical visit price
range $57.07 – $173.24
Typical copayment $32.81 (range $14.26 – $43.31)
Most-billed visit code 99204
Established Patient
$100.60 typical visit price
range $18.27 – $140.96
Typical copayment $25.15 (range $4.56 – $35.24)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Johnson Kay's NPI number?

The NPI number for Johnson Kay is 1184688061. It was assigned to this individual provider in the NPPES registry on April 17, 2006.

Where is Johnson Kay located?

Johnson Kay practices at 4475 S Eastern Ave Ste 2400, Las Vegas, NV 89119. The listed phone number is (702) 954-7672.

What is Johnson Kay's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.

Is Johnson Kay enrolled in Medicare?

Yes. Johnson Kay is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Johnson Kay's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Johnson Kay reassigns Medicare benefits to Optum Medical Group II Rhodes P C (Las Vegas, NV). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Johnson Kay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Johnson Kay was last updated on July 29, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.