Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Michael Gerard Lyon, MD

Individual provider Rheumatology Physician · NPI 1255357968

Dr. Michael Gerard Lyon, MD is a Rheumatology Physician in Livermore, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

4951 Arroyo Rd Vamc 111(LD)
Livermore, CA 94550-9650
Phone: (650) 493-5000
Fax: (925) 449-6522
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence G47269 (CA)

Record details

NPI number1255357968
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 14, 2006
Last updated in NPPESJuly 9, 2007
Mailing address4951 Arroyo Rd, Vamc 111(Ld), Livermore, CA 94550-9650