Dr Guillermo Castillo, MD - Medicare Family Medicine in San Diego, CA

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Dr Guillermo Castillo, MD is a medicare enrolled "Family Medicine" physician in San Diego, California. His current practice location is 2001 4th Ave, San Diego, California. You can reach out to his office (for appointments etc.) via phone at (858) 499-2717.

Dr Guillermo Castillo is licensed to practice in California (license number A83282) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1366558322.

Contact Information

Dr Guillermo Castillo, MD
2001 4th Ave,
San Diego, CA 92101-2303
(858) 499-2717
(858) 636-2210

Map and Direction




Physician's Profile

Full NameDr Guillermo Castillo
GenderMale
SpecialityFamily Medicine
Location2001 4th Ave, San Diego, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1366558322
  • Provider Enumeration Date: 08/22/2006
  • Last Update Date: 05/05/2017
  Medicare PECOS Information:
  • PECOS PAC ID: 9032186796
  • Enrollment ID: I20040913000620

Medical Identifiers

Medical identifiers for Dr Guillermo Castillo such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1366558322NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine A83282 (California)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Guillermo Castillo allows following entities to bill medicare on his behalf.
Entity NameSky-care Diagnostic Monitoring Center Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1295495190
PECOS PAC ID: 2961844105
Enrollment ID: O20240520003654
Entity NameVital Care Health Group A Medical Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1619778289
PECOS PAC ID: 6103345061
Enrollment ID: O20250522003218
Entity NameB&r Wound Care
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1013781350
PECOS PAC ID: 3678015328
Enrollment ID: O20250522003260

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Guillermo Castillo is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Guillermo Castillo, MD
2001 4th Ave,
San Diego, CA 92101-2303

Ph: (858) 499-2717		Dr Guillermo Castillo, MD
2001 4th Ave,
San Diego, CA 92101-2303

Ph: (858) 499-2717

Reviews and Comments


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Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.