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THAI NGUYEN
NPI 1295361343
Internal Medicine in Oakland, CA

Active since March 20, 2020PECOS EnrolledAccepts Medicare Assignment
494 HAWTHORNE AVE, OAKLAND, CA 94609(510) 451-0996 Get Directions Write a Review

NPPES record last updated: July 10, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 10, 2026, Aug 10, 2023, Apr 11, 2023 and 1 more (4 updates tracked since 2020).

About Thai Nguyen NPPES

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

THAI NGUYEN (NPI 1295361343) is an individual internal medicine provider in Oakland, California, licensed in California (20A20430) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS and is a graduate of Loma Linda University School Of Medicine (2023).

NPPES Registry Identity

NPI1295361343
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameTHAI NGUYEN
Location Address494 HAWTHORNE AVEOakland, CA 94609-3037
Mailing Address494 Hawthorne AveOakland, CA 94609-3037
Phone(510) 451-0996
Sole ProprietorNo
Medical School CMSLoma Linda University School Of MedicineGraduated 2023
Enumeration DateMarch 20, 2020
Last NPPES UpdateJuly 10, 20264 updates tracked since enumeration
NPPES CertifiedJuly 10, 2026
✔ NPI 1295361343 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 · 20A20430
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.
494 HAWTHORNE AVE, Oakland, CA 94609
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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

Thai Nguyen 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 ID8820450877
PECOS Enrollment IDI20230808003578
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 Reassignments

3

Medicare enrollment records show Thai Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

West Coast Kidney
17 mi
Nephrology
2222 EAST ST STE 305
Concord, CA 94520
  • Reassigned Medicare billing, California enrollment
  • 63 clinicians in this Medicare group
NPI 1952914681 (925) 686-1230
County Of Riverside
376 mi
Federally Qualified Health Center (FQHC)
8876 MISSION BLVD
Jurupa Valley, CA 92509
  • Reassigned Medicare billing, California enrollment
  • 336 clinicians in this Medicare group
NPI 1871607713 (951) 360-8795
Riverside Faculty Medical Group Inc
392 mi
Internal Medicine
26520 CACTUS AVE
Moreno Valley, CA 92555
  • Reassigned Medicare billing, California enrollment
  • 111 clinicians in this Medicare group
NPI 1124032461 (951) 486-5700

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.

Limited ultrasound scan of abdomen 76705
A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.
48 services17 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
35 services24 patients
Drainage of fluid from abdominal cavity using imaging guidance 49083
This procedure involves removing excess fluid from your abdominal cavity, which can relieve discomfort. A specialist uses imaging technology to guide a thin needle into the right spot. The fluid is then drained out safely.
31 services14 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
25 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94609 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 2

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

DR. SIDHARTH VERMA D.C.
Chiropractor
494 HAWTHORNE AVE, SUITE A
OAKLAND, CA 94609
Alameda County (510) 654-8547
DR. JAN MURRAY CORWIN DC
Chiropractor (Sports Physician)
494 HAWTHORNE AVE, SUITE A
OAKLAND, CA 94609
Alameda County (510) 654-8547

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 Thai Nguyen's NPI number?

The NPI number for Thai Nguyen is 1295361343. It was assigned to this individual provider in the NPPES registry on March 20, 2020.

Where is Thai Nguyen located?

Thai Nguyen practices at 494 Hawthorne Ave, Oakland, CA 94609. The listed phone number is (510) 451-0996.

What is Thai Nguyen's specialty?

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

Is Thai Nguyen enrolled in Medicare?

Yes. Thai Nguyen 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 organizations bill Medicare for Thai Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thai Nguyen reassigns Medicare benefits to 3 organizations: West Coast Kidney (Concord, CA), County Of Riverside (Jurupa Valley, CA) and Riverside Faculty Medical Group Inc (Moreno Valley, CA). Each 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 Thai Nguyen'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 Thai Nguyen was last updated on July 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.