MEDICAL DOCTORS GROUP, INC
NPI 1407237159
Internal Medicine in San Leandro, CA

Q: What is Medical Doctors Group, Inc's NPI number?

The NPI number for Medical Doctors Group, Inc is 1407237159. It was assigned to this organization in the NPPES registry on June 17, 2015.

Q: What is Medical Doctors Group, Inc's specialty?

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

Active since June 17, 2015

433 ESTUDILLO AVE STE 206, SAN LEANDRO, CA 94577(510) 969-4166(510) 969-5530 Get Directions Write a Review

NPPES record last updated: March 17, 2018. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Medical Doctors Group, Inc NPPES

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

MEDICAL DOCTORS GROUP, INC (NPI 1407237159) is a healthcare organization registered as an internal medicine in San Leandro, California and active in the NPI registry since June 2015. The organization maintains a secondary practice location in Oakland and lists Ernest Lincoln Bonner, Ceo, as its authorized official.

NPPES Registry Identity

NPI1407237159

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameMEDICAL DOCTORS GROUP, INC

Location Address433 ESTUDILLO AVE STE 206San Leandro, CA 94577-4915

Mailing Address2014 Santa Clara AveAlameda, CA 94501-2721 · (510) 847-1581

Phone(510) 969-4166

Fax(510) 969-5530

Organization SubpartNo

Authorized OfficialErnest Lincoln BonnerCeo · (510) 847-1581

Enumeration DateJune 17, 2015

Last NPPES UpdateMarch 17, 2018

✔ NPI 1407237159 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 · A30477

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.

433 ESTUDILLO AVE STE 206, San Leandro, CA 94577

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Secondary Practice Location 1

Location 110850 MacArthur Blvd, suite 303Oakland, CA 94605-5266 · Phone (510) 969-4166 · Fax (510) 969-5530

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Medical Doctors Group, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Medical Doctors Group, Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Ernest Bonner, MD

Internal Medicine

NPI 1992785703

1406 PARK ST SUITE 400
Alameda, CA 94501

(810) 864-9600

✔ PECOS✔ Accepts Medicare5.7 mi

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

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 Medical Doctors Group, Inc's NPI number?

The NPI number for Medical Doctors Group, Inc is 1407237159. It was assigned to this organization in the NPPES registry on June 17, 2015.

Where is Medical Doctors Group, Inc located?

Medical Doctors Group, Inc is located at 433 Estudillo Ave Ste 206, San Leandro, CA 94577. The listed phone number is (510) 969-4166.

What is Medical Doctors Group, Inc's specialty?

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

Is Medical Doctors Group, Inc enrolled in Medicare?

Yes. Medical Doctors Group, Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Medical Doctors Group, Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Medical Doctors Group, 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.

When was this NPI record last updated?

The NPPES record for Medical Doctors Group, Inc was last updated on March 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.