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NELSON YOIUM-TSIU CHANG MD
NPI 1689316648
Family Medicine in Tracy, CA

Active since April 11, 2022PECOS EnrolledAccepts Medicare Assignment
2151 W GRANT LINE RD, TRACY, CA 95377(209) 373-2816(209) 373-2873 Get Directions Write a Review

NPPES record last updated: May 27, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 27, 2026, Mar 23, 2026, Apr 12, 2022 (3 updates tracked since 2022).

About Nelson Yoium-tsiu Chang Md NPPES

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

NELSON YOIUM-TSIU CHANG MD (NPI 1689316648) is an individual family medicine provider in Tracy, California, licensed in California (A190393) and active in the NPI registry since April 2022. He is enrolled in Medicare PECOS and is a graduate of Other (2022).

NPPES Registry Identity

NPI1689316648
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameNELSON YOIUM-TSIU CHANGCredential: MD
Location Address2151 W GRANT LINE RDTracy, CA 95377-7309
Mailing Address2151 W Grant Line RdTracy, CA 95377-7309 · (209) 820-1500
Phone(209) 373-2816
Fax(209) 373-2873
Sole ProprietorNo
Medical School CMSOtherGraduated 2022
Enumeration DateApril 11, 2022
Last NPPES UpdateMay 27, 20263 updates tracked since enumeration
NPPES CertifiedMay 27, 2026
✔ NPI 1689316648 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · A190393
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
2151 W GRANT LINE RD, Tracy, CA 95377
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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

Nelson Yoium-tsiu Chang Md 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 ID6709342330
PECOS Enrollment IDI20260803003022
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 Nelson Chang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Community Medical Centers Inc
Same address
Federally Qualified Health Center (FQHC)
2151 W GRANT LINE RD
Tracy, CA 95377
  • Reassigned Medicare billing, California enrollment
  • 154 clinicians in this Medicare group
NPI 1164919049 (209) 820-1500

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95377 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
$90.32 typical visit price
range $58.87 – $176.60
Typical copayment $22.58 (range $14.71 – $44.15)
Most-billed visit code 99203
Established Patient
$103.36 typical visit price
range $19.28 – $144.60
Typical copayment $25.84 (range $4.82 – $36.15)
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 20

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

DAISY YONZON JONES DO
Pediatrics
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 832-0535
JUAN JOSE JUVENAL VERGARA SAAVEDRA M.D.
Internal Medicine
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 832-0535
COMMUNITY MEDICAL CENTERS INC
Clinic/Center (Federally Qualified Health Center (FQHC))
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 820-1500
ROBERT R WILLIAMS M.D.
Internal Medicine
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 832-0535
ANITA XUE M.D.
Anesthesiology
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 832-0535
KHOSROW VAKHSHOURI M.D.
Family Medicine
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 832-0535
SYDNEY BREE HANSEN MS, RD
Dietitian, Registered
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 820-1500
CHRISTOPHER ROBERT FOSSACECA MD
Anesthesiology
2151 W GRANT LINE RD
TRACY, CA 95377
San Joaquin County (209) 832-0535

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 Nelson Chang's NPI number?

The NPI number for Nelson Chang is 1689316648. It was assigned to this individual provider in the NPPES registry on April 11, 2022.

Where is Nelson Chang located?

Nelson Chang practices at 2151 W Grant Line Rd, Tracy, CA 95377. The listed phone number is (209) 373-2816.

What is Nelson Chang's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Nelson Chang enrolled in Medicare?

Yes. Nelson Chang 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 Nelson Chang's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nelson Chang reassigns Medicare benefits to Community Medical Centers Inc (Tracy, 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 Nelson Chang'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 Nelson Chang was last updated on May 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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.