Carla Castillo, MD
NPI 1043870371 · Family Medicine Physician · Martinez, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Carla Castillo, MD is a Family Medicine Physician provider in Martinez, CA (NPI 1043870371).
Provider details
- NPI number
- 1043870371
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
83% 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 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 21 | 12 |
| Metformin Hcl | 19 | — |
| Amlodipine Besylate | 16 | 11 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 11 | — |
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)
- 2000 Sierra RoadConcord, CA 94518Phone: (925) 363-2000
Registry dates
- Enumerated
- 2019-06-18
- Last updated
- 2022-11-15
- Certified
- 2022-09-21
Frequently asked questions
- What is Carla Castillo's NPI number?
- Carla Castillo's National Provider Identifier (NPI) is 1043870371, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Carla Castillo's specialty?
- Carla Castillo is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Carla Castillo located?
- Carla Castillo's practice location on file with NPPES is 2500 Alhambra Ave, Martinez, CA 94553-3156.
- What is Carla Castillo's phone number?
- The practice phone number listed in the NPPES registry for Carla Castillo is (925) 370-5000.
- Does Carla Castillo accept Medicare?
- Carla Castillo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Carla Castillo's NPI active?
- Yes — Carla Castillo's NPI (1043870371) is active in the NPPES registry as of the last update on 2022-11-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.