NPPES file of Aug 9, 2026

Guillermo Castillo, M.D.

Family Medicine Physician · San Diego, CA

Guillermo Castillo, M.D. is a family medicine physician with a practice address in San Diego, California, and NPI 1366558322, issued on Aug 22, 2006. Check the license (California A83282, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1366558322
Name
Guillermo Castillo
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
A83282 CA
Self-reported in NPPES; status is on the state search
Practice location
2001 4TH Ave, San Diego, CA 92101
Phone
(858) 499-2717
Enumerated
Aug 22, 2006
Record last updated
May 5, 2017 (not updated in 9 years: call before relying on the address or phone)
Fax
(858) 636-2210
Medicare enrollment
Enrolled (PECOS I20040913000620); may accept Medicare assignment
Medical or professional school
University Of Southern California Keck School Of Medicine, 2001
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →

Also registered at 2001 4TH Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Kathryn Adams, M.D.Internal Medicine Physician1588947196
  2. Andrea Adriany, PTOrthopedic Physical Therapist1437375169
  3. Kim Allen, RPHPharmacist1790771186
  4. Susan Athans, PTOrthopedic Physical Therapist1710106950
  5. Donald Balfour, M.D.Hematology & Oncology Physician1942217872
  6. Robyn Bodecker, PA-CPhysician Assistant1427067727

Verify Guillermo Castillo in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A83282    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

53% fewer Medicare Part D claims than the average family medicine physician in 2024

1,683 Medicare Part D claims for 80 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.

  1. Guillermo Castillo1,683
  2. Specialty average3,544

Most prescribed

  1. Trazodone Hcl89 claims
  2. Atorvastatin Calcium87 claims
  3. Amlodipine Besylate62 claims
  4. Furosemide51 claims
  5. Metformin Hcl48 claims
  6. Quetiapine Fumarate47 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $350.35

6 payments; by number, the most common kind was food and beverage; the largest payer was CVRx, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Guillermo Castillo$350.35
  2. Specialty average$902.55

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Vital Care Health Group A Medical CorporationRiverside, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Guillermo Castillo among 17,133 family medicine physician records in California

Guillermo Castillo, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.

  • NPI issued2006 · 6% of these records are older, 59% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 62% of these records are
  • Graduated2001 · median 2005 among the 10,652 with a school on file
  • Record last updated2017 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

780 family medicine physician records list a practice address in San Diego

They are 780 of the 52,937 NPPES records with a practice address in San Diego, and 17,133 family medicine physician records in California.

All 17,133 in California → Every provider in San Diego → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Ian Brickl, MDSan Diego, CA 921011396721080
  2. John Carey, D.O.San Diego, CA 921011801893672
  3. Ulysses Carino, M.D.San Diego, CA 921011265441596
  4. Foster Carr, M.D.San Diego, CA 921011194835918
  5. Habib Dalhoumi, M.D.San Diego, CA 921011275533465
  6. Christopher Fernandez Del Riego, M.D.San Diego, CA 921011063446763
  7. Robert Houghton, M.D.San Diego, CA 921011124138045
  8. Tasha Le, M.D.San Diego, CA 921011295744563

Common questions

What is Guillermo Castillo, M.D.'s NPI number?

Guillermo Castillo, M.D.'s National Provider Identifier (NPI) is 1366558322, issued on Aug 22, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Guillermo Castillo, M.D. located?

The NPPES record lists a practice address at 2001 4TH Ave, San Diego, CA, 92101. Phone: (858) 499-2717. Providers update this record themselves, so call before visiting.

How can I verify Guillermo Castillo, M.D.'s license?

NPPES lists California license number A83282, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Guillermo Castillo, M.D. prescribe under Medicare Part D?

In 2024, Guillermo Castillo, M.D. had 1,683 Medicare Part D claims for 80 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.