Roger Castillo, PA-C
NPI 1134235773 · Physician Assistant · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Roger Castillo, PA-C is a Physician Assistant provider in Walnut Creek, CA (NPI 1134235773).
Provider details
- NPI number
- 1134235773
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 152 (MT)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 30 | 17 |
| Metformin Hcl | 28 | 17 |
| Amlodipine Besylate | 26 | 15 |
| Atorvastatin Calcium | 26 | 20 |
| Losartan Potassium | 20 | 12 |
| Levothyroxine Sodium | 17 | — |
| Hydrochlorothiazide |
Practice location
Mailing address
Additional practice locations (2)
- 3075 North Reserve Street, Suite QMissoula, MT 59808Phone: (406) 327-1850
- 3075 North Reserve Street, Suite QMissoula, MT 59808Phone: (406) 327-1850
Registry dates
- Enumerated
- 2006-08-23
- Last updated
- 2019-07-12
Frequently asked questions
- What is Roger Castillo's NPI number?
- Roger Castillo's National Provider Identifier (NPI) is 1134235773, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Roger Castillo's specialty?
- Roger Castillo is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Roger Castillo located?
- Roger Castillo's practice location on file with NPPES is 1450 Treat Blvd # 160, Walnut Creek, CA 94597.
- What is Roger Castillo's phone number?
- The practice phone number listed in the NPPES registry for Roger Castillo is (925) 296-9000.
- Does Roger Castillo accept Medicare?
- Roger Castillo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Roger Castillo's NPI active?
- Yes — Roger Castillo's NPI (1134235773) is active in the NPPES registry as of the last update on 2019-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.