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GUSTAVO CASILLAS MD
NPI 1851582324
Family Medicine in El Monte, CA

Active since August 08, 2007PECOS Enrolled
10418 VALLEY BLVD # B, EL MONTE, CA 91731(626) 453-8466(626) 453-8465 Get Directions Write a Review

NPPES record last updated: November 9, 2011. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Gustavo Casillas Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GUSTAVO CASILLAS MD (NPI 1851582324) is an individual family medicine provider in El Monte, California, licensed in California (A102761) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1851582324
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameGUSTAVO CASILLASCredential: MD
Location Address10418 VALLEY BLVD # BEl Monte, CA 91731-3600
Mailing Address10418 Valley Blvd # BEl Monte, CA 91731-3600 · (626) 453-8466 · Fax (626) 453-8465
Phone(626) 453-8466
Fax(626) 453-8465
Sole ProprietorYes
Enumeration DateAugust 8, 2007
Last NPPES UpdateNovember 9, 2011
✔ NPI 1851582324 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · A102761
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
10418 VALLEY BLVD # B, El Monte, CA 91731
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Gustavo Casillas Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Gustavo Casillas reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Healthcare Partners Affiliates Medical Group
14 mi
Internal Medicine
1120 W WASHINGTON BLVD
Los Angeles, CA 90015
  • Reassigned Medicare billing, California enrollment
  • 2,052 clinicians in this Medicare group
NPI 1659312593 (213) 623-2225

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91731 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gustavo Casillas's NPI number?

The NPI number for Gustavo Casillas is 1851582324. It was assigned to this individual provider in the NPPES registry on August 8, 2007.

Where is Gustavo Casillas located?

Gustavo Casillas practices at 10418 Valley Blvd # B, El Monte, CA 91731. The listed phone number is (626) 453-8466.

What is Gustavo Casillas's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Gustavo Casillas enrolled in Medicare?

Yes. Gustavo Casillas is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Gustavo Casillas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gustavo Casillas reassigns Medicare benefits to Healthcare Partners Affiliates Medical Group (Los Angeles, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gustavo Casillas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Gustavo Casillas was last updated on November 9, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.