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DR. CHAO SUN M.D.
NPI 1013118884
Preventive Medicine - Occupational Medicine in Pleasanton, CA

Active since May 30, 2007PECOS Enrolled
5700 STONERIDGE MALL RD STE 100, PLEASANTON, CA 94588(925) 915-9530 Get Directions Write a Review

NPPES record last updated: August 21, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Chao Sun M.d. NPPES

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

DR. CHAO SUN M.D. (NPI 1013118884) is an individual occupational medicine provider in Pleasanton, California, licensed in California (A101860) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS and is a graduate of Other (1983).

NPPES Registry Identity

NPI1013118884
Entity TypeIndividualMale
Primary Taxonomy2083X0100X
Provider Legal NameDR. CHAO SUNCredential: M.D.
Location Address5700 STONERIDGE MALL RD STE 100Pleasanton, CA 94588-2872
Mailing Address770 Mason StVacaville, CA 95688-4646 · (707) 454-5800 · Fax (707) 454-5938
Phone(925) 915-9530
Sole ProprietorNo
Medical School CMSOtherGraduated 1983
Enumeration DateMay 30, 2007
Last NPPES UpdateAugust 21, 2012
✔ NPI 1013118884 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPreventive Medicine · Occupational MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2083X0100X
License✔ Licensed in CA · A101860
Definition
Occupational medicine focuses on the health of workers, including the ability to perform work; the physical, chemical, biological, and social environments of the workplace; and the health outcomes of environmental exposures. Practitioners in this field address the promotion of health in the work place, and the prevention and management of occupational and environmental injury, illness, and disability.
5700 STONERIDGE MALL RD STE 100, Pleasanton, CA 94588
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Other Names 1

Professional Name (2)Dr. Chao Sun M.d.

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Chao Sun M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7113000787
PECOS Enrollment IDI20080206000312
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 Chao Sun reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Express Medicine Urgent Care, Inc.
Same address
Urgent Care
5700 STONERIDGE MALL RD, SUITE 100
Pleasanton, CA 94588
  • Reassigned Medicare billing, California enrollment
NPI 1578818696 (925) 915-9530

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 3

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.
1,257 services99 patients
Osteopathic manipulative treatment, 9-10 body regions 98929
Osteopathic Manipulative Treatment (OMT) involves hands-on care. In a 9-10 body regions procedure, a doctor manipulates muscles and joints using techniques like stretching, gentle pressure, and resistance to improve health and wellness. It's often used to ease pain, promote healing, and increase overall mobility.
568 services35 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.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94588 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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
11 suppliers43 claims98 services$4.85 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
10 suppliers21 claims23 services$0.88 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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 Chao Sun's NPI number?

The NPI number for Chao Sun is 1013118884. It was assigned to this individual provider in the NPPES registry on May 30, 2007. The provider is also known as Dr. Chao Sun M.D..

Where is Chao Sun located?

Chao Sun practices at 5700 Stoneridge Mall Rd Ste 100, Pleasanton, CA 94588. The listed phone number is (925) 915-9530.

What is Chao Sun's specialty?

The primary specialty registered for this NPI is Preventive Medicine, specializing in Occupational Medicine, with taxonomy code 2083X0100X.

Is Chao Sun enrolled in Medicare?

Yes. Chao Sun is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Chao Sun's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Chao Sun reassigns Medicare benefits to Express Medicine Urgent Care, Inc. (Pleasanton, CA). 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 Chao Sun'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 Chao Sun was last updated on August 21, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.