WILLIAM BAO, MD INC
NPI 1477639789
Internal Medicine in City Of Industry, CA

Q: What is William Bao, MD Inc's NPI number?

The NPI number for William Bao, MD Inc is 1477639789. It was assigned to this organization in the NPPES registry on October 29, 2006.

Q: What is William Bao, MD Inc's specialty?

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

Active since October 29, 2006CLIA 05D1009528 · Waiver

17595 ALMAHURST ST STE 202, CITY OF INDUSTRY, CA 91748(626) 581-4990(626) 581-4011 Get Directions Write a Review

NPPES record last updated: August 22, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About William Bao, Md Inc NPPES

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

WILLIAM BAO, MD INC (NPI 1477639789) is a healthcare organization registered as an internal medicine in City Of Industry, California and active in the NPI registry since October 2006. The organization holds a CLIA Waiver certificate valid through February 17, 2027 and lists William Bao, Provider/president, as its authorized official.

NPPES Registry Identity

NPI1477639789

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameWILLIAM BAO, MD INC

Location Address17595 ALMAHURST ST STE 202City Of Industry, CA 91748-1799

Mailing Address17595 Almahurst St Ste 202City Of Industry, CA 91748-1799 · (626) 581-4990 · Fax (626) 581-4011

Phone(626) 581-4990

Fax(626) 581-4011

Organization SubpartNo

Authorized OfficialWilliam BaoProvider/president · (626) 581-4990

Enumeration DateOctober 29, 2006

Last NPPES UpdateAugust 22, 2020

✔ NPI 1477639789 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

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.

17595 ALMAHURST ST STE 202, City Of Industry, CA 91748

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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Bao, Md Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by February 28, 2027

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date

StateCaliforniaEnrollment IDO20110510000813Non-DME Part B · Clinic/Group PracticeDue dateFebruary 28, 2027

Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to William Bao, MD Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Wei Bao, M.D.

Internal Medicine

NPI 1437199304

17595 ALMAHURST ST
City Of Industry, CA 91748

(626) 581-4990

✔ PECOS✔ Accepts MedicareSame address

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D1009528

William Bao MD Inc · City Of Industry, CA

Active · expires Feb 17, 2027

CLIA Number05D1009528

Laboratory TypePhysician Office

Certificate Effective DateFebruary 18, 2025

Certificate Expiration DateFebruary 17, 2027

Laboratory DirectorWilliam W. Bao MD

Laboratory Phone(626) 581-4990

Laboratory LocationWilliam Bao MD Inc17595 Almahurst St Suite 202, City Of Industry, CA 91748

CLIA data matches this NPI record on: Address Name Phone

This certificate is issued to a laboratory to perform only waived tests.

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 William Bao, MD Inc's NPI number?

The NPI number for William Bao, MD Inc is 1477639789. It was assigned to this organization in the NPPES registry on October 29, 2006.

Where is William Bao, MD Inc located?

William Bao, MD Inc is located at 17595 Almahurst St Ste 202, City Of Industry, CA 91748. The listed phone number is (626) 581-4990.

What is William Bao, MD Inc's specialty?

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

Is William Bao, MD Inc enrolled in Medicare?

Yes. William Bao, MD Inc is registered in the Medicare PECOS enrollment system.

When is William Bao, MD Inc's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by February 28, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through William Bao, MD Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to William Bao, MD Inc. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does William Bao, MD Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D1009528) is associated with this NPI, valid through February 17, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for William Bao, MD Inc was last updated on August 22, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.