DR. WENDY GU M.D.
NPI 1740579994
Internal Medicine in Hacienda Heights, CA

Q: What is Wendy Gu's NPI number?

The NPI number for Wendy Gu is 1740579994. It was assigned to this individual provider in the NPPES registry on March 28, 2011.

Q: What is Wendy Gu's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Wendy Gu was last updated on April 20, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since March 28, 2011PECOS EnrolledAccepts Medicare Assignment

1850 S AZUSA AVE, #205, HACIENDA HEIGHTS, CA 91745(626) 964-2880(626) 964-2834 Get Directions Write a Review

NPPES record last updated: April 20, 2021. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Apr 20, 2021, Mar 17, 2018, Jul 26, 2017 (3 updates tracked since 2017).

On this page

About Dr. Wendy Gu M.d. NPPES

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

DR. WENDY GU M.D. (NPI 1740579994) is an individual internal medicine provider in Hacienda Heights, California, licensed in California (A124115) and active in the NPI registry since March 2011. She is enrolled in Medicare PECOS and is a graduate of Other (2011).

NPPES Registry Identity

NPI1740579994

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameDR. WENDY GUCredential: M.D.

Location Address1850 S AZUSA AVE, #205Hacienda Heights, CA 91745-6813

Mailing Address1850 S Azusa Ave Ste 205Hacienda Heights, CA 91745-6853 · (626) 964-2880 · Fax (626) 964-2834

Phone(626) 964-2880

Fax(626) 964-2834

Sole ProprietorNo

Medical School CMSOtherGraduated 2011

Enumeration DateMarch 28, 2011

Last NPPES UpdateApril 20, 20213 updates tracked since enumeration

NPPES CertifiedApril 20, 2021

✔ NPI 1740579994 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 · A124115

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.

1850 S AZUSA AVE, Hacienda Heights, CA 91745

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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

Dr. Wendy Gu 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 ID3072737105

PECOS Enrollment IDI20140611002353

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 Wendy Gu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Colima Medical Clinic PC

Same address

Family Medicine

1850 S AZUSA AVE, SUITE 205
Hacienda Heights, CA 91745

Reassigned Medicare billing, California enrollment
7 clinicians in this Medicare group

NPI 1760585129 (626) 964-2880

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 14

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.

Injection, denosumab, 1 mg J0897

Denosumab is a medication given via injection to strengthen your bones. It works by slowing down the cells that break down bone, improving bone density and reducing the risk of fractures. It's often used for osteoporosis treatment.

960 services11 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.

247 services179 patients

Advance care planning, first 30 minutes 99497

Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.

246 services246 patients

Annual depression screening, 5 to 15 minutes G0444

An annual depression screening is a short, routine evaluation to check for signs of depression. It involves answering a series of questions about your feelings, thoughts, and behaviors. The process takes about 15 minutes and helps detect depression early for better management.

240 services240 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

232 services232 patients

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.

208 services149 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.

142 services99 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.

100 services99 patients

Influenza vaccine split virus, preservative free 90662

The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.

97 services96 patients

Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677

The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.

21 services21 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

21 services11 patients

Administration of pneumococcal vaccine G0009

The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.

21 services21 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.

12 services12 patients

Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment G0402

An Initial Preventive Physical Examination, also known as a "Welcome to Medicare" visit, is a one-time, face-to-face visit during your first 12 months of Medicare enrollment. It includes a review of your health, as well as education and counseling about preventive services and further screenings.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91745 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.

Referred Medical Equipment & Supplies CMS DME claims 3

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

12 suppliers43 claims86 services$4.35 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

8 suppliers31 claims36 services$0.79 avg. paid by Medicare

Hospital bed, semi-electric (head and foot adjustment), with any type side rails, without mattress E0261

DME-Hospital Beds · category DB000N

1 supplier17 claims17 services$41.46 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

PUENTE HILLS PHARMACY

Pharmacy (Community/Retail Pharmacy)

1850 S AZUSA AVE, SUITE 101
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 912-3311

MRS. JANE S GU MD

Pediatrics

1850 S AZUSA AVE, SUITE 205
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 964-2880

GARLAN G. LO M.D.

Ophthalmology

1850 S AZUSA AVE, STE 107
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 912-6888

MR. ANTHONY C. CHEN M.D.

Internal Medicine

1850 S AZUSA AVE, SUITE 102
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 912-2682

DR. STEPHEN CURTIS WONG M.D.

Allergy & Immunology (Allergy)

1850 S AZUSA AVE, SUITE 206
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 810-5450

ERNESTO G ONG M.D.

Pediatrics

1850 S AZUSA AVE
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 964-6012

RAYMOND WONG PHARM.D.

Durable Medical Equipment & Medical Supplies

1850 S AZUSA AVE, SUITE 101
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 912-3311

PIH HEALTH PHYSICIANS

Family Medicine

1850 S AZUSA AVE
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 964-3040

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 Wendy Gu's NPI number?

The NPI number for Wendy Gu is 1740579994. It was assigned to this individual provider in the NPPES registry on March 28, 2011.

Where is Wendy Gu located?

Wendy Gu practices at 1850 S Azusa Ave #205, Hacienda Heights, CA 91745. The listed phone number is (626) 964-2880.

What is Wendy Gu's specialty?

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

Is Wendy Gu enrolled in Medicare?

Yes. Wendy Gu 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 Wendy Gu's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Wendy Gu reassigns Medicare benefits to Colima Medical Clinic PC (Hacienda Heights, 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 Wendy Gu'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 Wendy Gu was last updated on April 20, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.