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

John T Armstrong Jr MD Inc

Organization Gynecology Physician · NPI 1598830564

John T Armstrong Jr MD Inc provides Gynecology Physician services in Napa, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

3434 Villa Ln Ste 360
Napa, CA 94558-6416 Not confirmed with CMS for 12 years — call before visiting
Phone: (707) 257-4317
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gynecology Physician (primary) Taxonomy 207VG0400X · Licence C37899 (CA)

Record details

NPI number1598830564
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official John Armstrong — President · (707) 255-8825
NPI enumeratedNovember 22, 2006
Last updated in NPPESAugust 28, 2014
Mailing address3010 Beard Rd, Napa, CA 94558-3442

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