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DR. JOHN WEIJUNE WANG M.D.
NPI 1720048291
Internal Medicine in Fountain Valley, CA

Active since March 27, 2006PECOS EnrolledAccepts Medicare Assignment
18785 BROOKHURST ST., SUITE 200, FOUNTAIN VALLEY, CA 92708(714) 378-5330(657) 276-4743 Get Directions Write a Review

NPPES record last updated: June 11, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 28, 2021, Mar 1, 2019 (2 updates tracked since 2019).

About Dr. John Weijune Wang M.d. NPPES

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

DR. JOHN WEIJUNE WANG M.D. (NPI 1720048291) is an individual internal medicine provider in Fountain Valley, California, licensed in California (A73379) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Texas Medical School At San Antonio (1999).

NPPES Registry Identity

NPI1720048291
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. JOHN WEIJUNE WANGCredential: M.D.
Location Address18785 BROOKHURST ST., SUITE 200Fountain Valley, CA 92708
Mailing Address18785 Brookhurst St., Suite 200Fountain Valley, CA 92708 · (714) 378-5330 · Fax (657) 276-4743
Phone(714) 378-5330
Fax(657) 276-4743
Sole ProprietorNo
Medical School CMSUniversity Of Texas Medical School At San AntonioGraduated 1999
Enumeration DateMarch 27, 2006
Last NPPES UpdateJune 11, 20262 updates tracked since enumeration
NPPES CertifiedJune 11, 2026
✔ NPI 1720048291 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 · A73379
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.
18785 BROOKHURST ST., SUITE 200, Fountain Valley, CA 92708
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Other Identifiers 1

Medicaid00A733790CA

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. John Weijune Wang M.d. 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 ID8527950567
PECOS Enrollment IDI20040325001402
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 John Wang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Memorialcare Medical Foundation
1.5 mi
Clinic/Center
17360 BROOKHURST ST
Fountain Valley, CA 92708
  • Reassigned Medicare billing, California enrollment
  • 948 clinicians in this Medicare group
NPI 1205167350 (877) 696-3622

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 10

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.
168 services117 patients
Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
144 services101 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
107 services104 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.
90 services77 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000
An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.
23 services17 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
19 services18 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92708 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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 4

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

MARGARET ZIMMERMAN MD
Pediatrics
18785 BROOKHURST ST., SUITE 200
FOUNTAIN VALLEY, CA 92708
Orange County (714) 378-5330
IHONG CHEN MD
Internal Medicine
18785 BROOKHURST ST., SUITE 200
FOUNTAIN VALLEY, CA 92708
Orange County (714) 378-5330
DR. MARIA SILVIA MARTINEZ-WIKEFELDT M.D.
Pediatrics
18785 BROOKHURST ST., SUITE 200
FOUNTAIN VALLEY, CA 92708
Orange County (714) 378-5330
LALITA M. KOMANAPALLI MD
Internal Medicine
18785 BROOKHURST ST., SUITE 200
FOUNTAIN VALLEY, CA 92708
Orange County (714) 378-5330

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 John Wang's NPI number?

The NPI number for John Wang is 1720048291. It was assigned to this individual provider in the NPPES registry on March 27, 2006.

Where is John Wang located?

John Wang practices at 18785 Brookhurst St., Suite 200, Fountain Valley, CA 92708. The listed phone number is (714) 378-5330.

What is John Wang's specialty?

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

Is John Wang enrolled in Medicare?

Yes. John Wang 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 John Wang's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Wang reassigns Medicare benefits to Memorialcare Medical Foundation (Fountain Valley, 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 John Wang'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 John Wang was last updated on June 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.