Gustavo Casillas, MD
NPI 1851582324 · Family Medicine Physician · El Monte, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gustavo Casillas, MD is a Family Medicine Physician provider in El Monte, CA (NPI 1851582324).
Provider details
- NPI number
- 1851582324
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A102761 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
18 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 342 | 124 |
| Metformin Hcl | 139 | 52 |
| Semaglutidebrand: Ozempic | 132 | 28 |
| Omeprazole | 75 | 30 |
| Losartan Potassium | 73 | 26 |
| Empagliflozinbrand: Jardiance | 70 | 21 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$107 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-08
- Last updated
- 2011-11-09
Frequently asked questions
- What is Gustavo Casillas's NPI number?
- Gustavo Casillas's National Provider Identifier (NPI) is 1851582324, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gustavo Casillas's specialty?
- Gustavo Casillas is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gustavo Casillas located?
- Gustavo Casillas's practice location on file with NPPES is 10418 Valley Blvd # B, El Monte, CA 91731-3600.
- What is Gustavo Casillas's phone number?
- The practice phone number listed in the NPPES registry for Gustavo Casillas is (626) 453-8466.
- Does Gustavo Casillas accept Medicare?
- Gustavo Casillas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gustavo Casillas's NPI active?
- Yes — Gustavo Casillas's NPI (1851582324) is active in the NPPES registry as of the last update on 2011-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.