Welby Nielsen, D.O.
NPI 1962611947 · Child & Adolescent Psychiatry Physician · San Luis Obispo, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Welby Nielsen, D.O. is a Child & Adolescent Psychiatry Physician provider in San Luis Obispo, CA (NPI 1962611947).
Provider details
- NPI number
- 1962611947
- Entity type
- Individual
- Primary specialty
- Child & Adolescent Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A11177 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2 documented practice locations
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 · 5 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Escitalopram Oxalate | 28 |
| Gabapentin | 25 |
| Vortioxetine Hydrobromidebrand: Trintellix | 13 |
| Aripiprazole | 13 |
| Lisdexamfetamine Dimesylate | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 2561 California Park Dr Ste 300Chico, CA 95928-4208Phone: (530) 838-4188Fax: (530) 809-2481
Registry dates
- Enumerated
- 2007-05-22
- Last updated
- 2018-03-29
Frequently asked questions
- What is Welby Nielsen's NPI number?
- Welby Nielsen's National Provider Identifier (NPI) is 1962611947, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Welby Nielsen's specialty?
- Welby Nielsen is listed in the NPPES registry with a primary specialty of Child & Adolescent Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Welby Nielsen located?
- Welby Nielsen's practice location on file with NPPES is 1039 Murray Ave Ste 220, San Luis Obispo, CA 93405-2058.
- What is Welby Nielsen's phone number?
- The practice phone number listed in the NPPES registry for Welby Nielsen is (805) 250-2996.
- Does Welby Nielsen accept Medicare?
- Welby Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Welby Nielsen's NPI active?
- Yes — Welby Nielsen's NPI (1962611947) is active in the NPPES registry as of the last update on 2018-03-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.