1. Home
  2. Directory
  3. California
  4. Hayward
  5. Internal Medicine
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MR. MARK KIM-LEON KHOO MD
NPI 1659351930
Internal Medicine in Hayward, CA

Active since January 20, 2006PECOS Enrolled
25800 CARLOS BEE BLVD, CSUEB STUDENT HEALTH SERVICES, HAYWARD, CA 94542(510) 885-3735(510) 885-3230 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Mr. Mark Kim-leon Khoo Md NPPES

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

MR. MARK KIM-LEON KHOO MD (NPI 1659351930) is an individual internal medicine provider in Hayward, California, licensed in California (G67768) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659351930
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMR. MARK KIM-LEON KHOOCredential: MD
Location Address25800 CARLOS BEE BLVD, CSUEB STUDENT HEALTH SERVICESHayward, CA 94542-3060
Mailing Address25800 Carlos Bee Blvd, Csueb Student Health ServicesHayward, CA 94542-3060 · (510) 885-3735 · Fax (510) 885-3230
Phone(510) 885-3735
Fax(510) 885-3230
Sole ProprietorNo
Enumeration DateJanuary 20, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1659351930 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G67768
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
25800 CARLOS BEE BLVD, Hayward, CA 94542
Open in Google Maps ↗

Other Identifiers 1

Medicaid00G677680CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mr. Mark Kim-leon Khoo Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94542 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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.

Other Providers at the Same Location NPPES 12

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ABAYOMI S JONES M.D.
Family Medicine
25800 CARLOS BEE BLVD
HAYWARD, CA 94542
Alameda County (520) 222-9664
MS. SHARON LYNN FRIEDMAN MD
General Practice
25800 CARLOS BEE BLVD, CSU EAST BAY STUDENT HEALTH SERVICES
HAYWARD, CA 94542
Alameda County (510) 885-3735
LOURDES PIOJO ATC, CSCS
Specialist/Technologist (Athletic Trainer)
25800 CARLOS BEE BLVD
HAYWARD, CA 94542
Alameda County (510) 885-3035
CALIFORNIA STATE UNIVERSITY EAST BAY
Clinic/Center (Student Health)
25800 CARLOS BEE BLVD
HAYWARD, CA 94542
Alameda County (510) 885-3735
JUNIA KIM
Community Health Worker
25800 CARLOS BEE BLVD
HAYWARD, CA 94542
Alameda County (510) 885-3524
MR. WILBUR LAWRENCE BORSKEY MD
General Practice
25800 CARLOS BEE BLVD, CALIFORNIA STATE UNIVERSITY EAST BAY
HAYWARD, CA 94542
Alameda County (510) 885-3735
LESLEE JANETH GONZALEZ
Community Health Worker
25800 CARLOS BEE BLVD
HAYWARD, CA 94542
Alameda County (510) 885-2737
CALIFORNIA STATE UNIVERSITY EAST BAY
Clinic/Center (Ambulatory Family Planning Facility)
25800 CARLOS BEE BLVD
HAYWARD, CA 94542
Alameda County (510) 885-3650

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 Mark Khoo's NPI number?

The NPI number for Mark Khoo is 1659351930. It was assigned to this individual provider in the NPPES registry on January 20, 2006.

Where is Mark Khoo located?

Mark Khoo practices at 25800 Carlos Bee Blvd Csueb Student Health Services, Hayward, CA 94542. The listed phone number is (510) 885-3735.

What is Mark Khoo's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mark Khoo enrolled in Medicare?

Yes. Mark Khoo is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mark Khoo was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 days 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.