Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Michael Lewis, MD

Individual provider Internal Medicine Physician · NPI 1700826740

Michael Lewis, MD is registered under Family Practice in Concord, California. Graduated from Northeastern Ohio University College of Medicine in 1987, 39 years ago. Practices with One Medical Group Inc, a 328-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
39
Trained at
Northeastern Ohio University College of Medicine
Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2001 Diamond Blvd Ste C-100
Concord, CA 94520-5737
Phone: (888) 663-6331
Fax: (415) 252-7176
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1333 Powell St, Emeryville, CA 94608-2598 — (510) 225-1000

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G64666 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence G64666 (CA)

Record details

NPI number1700826740
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 7, 2006
Last updated in NPPESMarch 17, 2025
Certification dateMarch 17, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolNORTHEASTERN OHIO UNIVERSITY COLLEGE OF MEDICINE
Graduated 1987 (39 years in practice)
Group practice One Medical Group Inc — 328 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients28
Services billed 41 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at One Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 328 clinicians in the practice; 12 are shown here.

Other providers in Concord