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