John T Armstrong Jr MD Inc
NPI 1598830564 · Gynecology Physician · Napa, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John T Armstrong Jr MD Inc is a Gynecology Physician organization in Napa, CA (NPI 1598830564).
Provider details
- NPI number
- 1598830564
- Entity type
- Organization
- Primary specialty
- Gynecology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Armstrong, President(707) 255-8825
- License
- C37899 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-22
- Last updated
- 2014-08-28
Frequently asked questions
- What is John T Armstrong Jr MD Inc's NPI number?
- John T Armstrong Jr MD Inc's National Provider Identifier (NPI) is 1598830564, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John T Armstrong Jr MD Inc?
- John T Armstrong Jr MD Inc is classified in the NPPES registry as Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is John T Armstrong Jr MD Inc located?
- John T Armstrong Jr MD Inc's practice location on file with NPPES is 3434 Villa Ln Ste 360, Napa, CA 94558-6416.
- What is John T Armstrong Jr MD Inc's phone number?
- The practice phone number listed in the NPPES registry for John T Armstrong Jr MD Inc is (707) 257-4317.
- Does John T Armstrong Jr MD Inc accept Medicare?
- John T Armstrong Jr MD Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for John T Armstrong Jr MD Inc?
- The authorized official listed on John T Armstrong Jr MD Inc's NPPES record is John Armstrong, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John T Armstrong Jr MD Inc's NPI active?
- Yes — John T Armstrong Jr MD Inc's NPI (1598830564) is active in the NPPES registry as of the last update on 2014-08-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.