Carol Castillo, MD
NPI 1104878909 · Family Medicine Physician · Sonoma, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Carol Castillo, MD is a Family Medicine Physician provider in Sonoma, CA (NPI 1104878909).
Provider details
- NPI number
- 1104878909
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G077909 (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
20 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
- 2006-05-17
- Last updated
- 2007-07-08
Frequently asked questions
- What is Carol Castillo's NPI number?
- Carol Castillo's National Provider Identifier (NPI) is 1104878909, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Carol Castillo's specialty?
- Carol Castillo is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Carol Castillo located?
- Carol Castillo's practice location on file with NPPES is 15000 Arnold Drive, Sonoma, CA 95431-1493.
- What is Carol Castillo's phone number?
- The practice phone number listed in the NPPES registry for Carol Castillo is (707) 938-6556.
- Does Carol Castillo accept Medicare?
- Carol Castillo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Carol Castillo's NPI active?
- Yes — Carol Castillo's NPI (1104878909) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.