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DR. WARREN SHU M.D.
NPI 1801802228
Internal Medicine in Pasadena, CA

Active since July 31, 2006PECOS EnrolledAccepts Medicare Assignment
401 S FAIR OAKS AVE, PASADENA, CA 91105(626) 795-2244(626) 795-5401 Get Directions Write a Review

NPPES record last updated: September 26, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Warren Shu M.d. NPPES

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

DR. WARREN SHU M.D. (NPI 1801802228) is an individual internal medicine provider in Pasadena, California, licensed in California (AO63784) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Medical College Of Wisconsin (1996).

NPPES Registry Identity

NPI1801802228
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WARREN SHUCredential: M.D.
Location Address401 S FAIR OAKS AVEPasadena, CA 91105-2603
Mailing Address797 S Fair Oaks AvePasadena, CA 91105-2617 · (626) 795-2244 · Fax (626) 795-5401
Phone(626) 795-2244
Fax(626) 795-5401
Sole ProprietorYes
Medical School CMSMedical College Of WisconsinGraduated 1996
Enumeration DateJuly 31, 2006
Last NPPES UpdateSeptember 26, 2023
✔ NPI 1801802228 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 · AO63784
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.
401 S FAIR OAKS AVE, Pasadena, CA 91105
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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. Warren Shu 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 ID7810898384
PECOS Enrollment IDI20040116000910
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

2

Medicare enrollment records show Warren Shu reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Southern California Permanente Medical Group
4.2 mi
Health Maintenance Organization
2626 COLORADO BLVD
Los Angeles, CA 90041
  • Reassigned Medicare billing, California enrollment
  • 13,921 clinicians in this Medicare group
NPI 1013409044 (877) 608-0044
Healthcare Partners Affiliates Medical Group
10 mi
Internal Medicine
1120 W WASHINGTON BLVD
Los Angeles, CA 90015
  • Reassigned Medicare billing, California enrollment
  • 2,052 clinicians in this Medicare group
NPI 1659312593 (213) 623-2225

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 91105 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 16

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

LU JIAO MD
Internal Medicine
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 304-4400
NITIN UBHAYAKAR MD
Emergency Medicine (Hospice and Palliative Medicine)
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 304-4400
DR. VICTOR NHAT-CHIEU LUU M.D.
Family Medicine
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 795-2244
MRS. SANDRA ILEANA DIAZ O'DONNELL PA-C
Physician Assistant
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 795-2244
DR. PHILLIP HOWARD ANDERSON LEE M.D.
Dermatology
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 405-7221
DR. CLAUDIA UNA PFEIL M.D.
Internal Medicine
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 795-7556
RANDY DEBBER PA-C
Physician Assistant (Medical)
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 304-4400
DR. TIMOTHY CROSS BALLARD M.D.
Emergency Medicine
401 S FAIR OAKS AVE
PASADENA, CA 91105
Los Angeles County (626) 795-2244

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 Warren Shu's NPI number?

The NPI number for Warren Shu is 1801802228. It was assigned to this individual provider in the NPPES registry on July 31, 2006.

Where is Warren Shu located?

Warren Shu practices at 401 S Fair Oaks Ave, Pasadena, CA 91105. The listed phone number is (626) 795-2244.

What is Warren Shu's specialty?

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

Is Warren Shu enrolled in Medicare?

Yes. Warren Shu 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 Warren Shu's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Warren Shu reassigns Medicare benefits to 2 organizations: Southern California Permanente Medical Group (Los Angeles, CA) and Healthcare Partners Affiliates Medical Group (Los Angeles, 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 Warren Shu'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 Warren Shu was last updated on September 26, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.