John Weixler, NP
NPI 1699438820 · Psychiatric/Mental Health Nurse Practitioner · Fairfield, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Weixler, NP is a Psychiatric/Mental Health Nurse Practitioner provider in Fairfield, CA (NPI 1699438820).
Provider details
- NPI number
- 1699438820
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Male
- Sole proprietor
- No
- License
- 95018841 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bupropion Hclbrand: Bupropion Xl | 72 | 15 |
| Quetiapine Fumarate | 62 | 15 |
| Duloxetine Hcl | 57 | — |
| Sertraline Hcl | 56 | 16 |
| Lamotrigine | 44 | — |
| Trazodone Hcl | 41 | 15 |
| Escitalopram Oxalate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-10-14
- Last updated
- 2025-09-04
- Certified
- 2025-09-04
Frequently asked questions
- What is John Weixler's NPI number?
- John Weixler's National Provider Identifier (NPI) is 1699438820, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Weixler's specialty?
- John Weixler is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is John Weixler located?
- John Weixler's practice location on file with NPPES is 470 Chadbourne Rd Ste a, Fairfield, CA 94534-9620.
- What is John Weixler's phone number?
- The practice phone number listed in the NPPES registry for John Weixler is (707) 419-8989.
- Does John Weixler accept Medicare?
- John Weixler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Weixler's NPI active?
- Yes — John Weixler's NPI (1699438820) is active in the NPPES registry as of the last update on 2025-09-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.