Dr. Guillermo Castillo, MD
- Medicare services, 2024
- 27
- Medicare patients, 2024
- 27
- Part D claims, 2024
- 1,683
- Industry payments
- $9,062
- Affiliated sites
- 12
- Practice address
- 6755 Mira Mesa Blvd, San Diego, CA 92121
- Practice phone
- Call (800) 635-6901
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Precision Diagnostics
San Diego, California
Find Dr. Castillo's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Guillermo Castillo is a family medicine physician in San Diego, California
Dr. Castillo practices at Precision Diagnostics in San Diego, California.
Dr. Castillo's NPI, 1366558322, was assigned on August 22, 2006. Dr. Castillo graduated from Keck School of Medicine of USC in 2001. Dr. Castillo holds California license A83282.
- NPI
- 1366558322NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032186796
- NPI enumeration date
- August 22, 2006
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (800) 635-6901
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Guillermo Castillo practices at Precision Diagnostics in San Diego, California
Dr. Castillo's primary practice is Precision Diagnostics, at 6755 Mira Mesa Blvd, San Diego, CA 92121 in San Diego County. The practice phone is (800) 635-6901.
- Precision Diagnostics6755 Mira Mesa Blvd, San Diego, CA 92121 · San Diego CountyPhone(800) 635-6901
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Guillermo Castillo is affiliated with 13 sites of care and 1 medical group
Dr. Castillo's primary practice is Precision Diagnostics in San Diego, California. The medical group on file is Vital Care Health Group. Dmand AI also links Dr. Castillo to 4 more physician offices, 4 home health agencies, 3 hospices and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Guillermo Castillo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Castillo practices, 12 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Precision Diagnostics | Available with a free account |
| +12 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Guillermo Castillo is one of 15,680 family medicine physicians in California
Family medicine is Dr. Castillo's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dmand AI has Dr. Castillo's licenses on file in 8 states: California, New York, Virginia, Connecticut, Florida, Ohio, Maine and Rhode Island.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
- New York license
- Virginia license
- Connecticut license
- Florida license
- Ohio license
- Maine license
- Rhode Island license
Family medicine physicians near Dr. Castillo
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Guillermo Castillo billed Medicare for 27 services in 2024
CMS data shows 27 Medicare services from Dr. Castillo across 1 procedure code in 2024, for 27 Medicare patients. Medicare paid $20,454 for them. Every service was in an office.
Dr. Castillo's Medicare services by type, 2019 to 2024
- 2019
- 2024
- Tests and treatments
- 2019: 02024: 27
- Office and hospital visits
- 2019: 7332024: 0100%
Dr. Castillo compared with the California median for family medicine physicians, 2024
- Dr. Castillo
- California median
- Medicare services
- 27vs 24689% below
- Medicare patients
- 27vs 11877% below
- Part D claims
- 1,229vs 83348% above
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Castillo's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Castillo and other family medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Guillermo Castillo treated 27 Medicare patients in 2024, average age 78
CMS counts 27 Medicare patients who saw Dr. Castillo in 2024. The largest group is 75 to 84, with 11 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.17, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Castillo's median patient age at 71, with 45% women.
Dr. Castillo's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Castillo's Medicare patients by sex, 2024
- Women1244%
- Men1556%
Chronic conditions among Dr. Castillo's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Ischemic heart disease59%
Share of Medicare patients with each condition. A patient can have several.
Dr. Castillo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women45%
- Men55%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Guillermo Castillo wrote 1,683 Medicare Part D claims in 2024
In 2024, Dr. Castillo wrote 1,683 Medicare Part D claims for 80 patients. 89% of them were for generic drugs. CMS names the drug for 1,229 of them, across 44 drugs with 11 or more claims each, at $116,890 in total drug cost. In 2023, CMS named 104 claims across 8 drugs.
Dr. Castillo's Part D claims by kind of drug, 2024
- Generic1,495 claims89%
- Brand-name and other188 claims11%
Dr. Castillo's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Castillo's Part D claims, 2024
- Antibiotics2%38 of 1,683 claims
- Antipsychotics, patients 65 and over9%145 of 1,683 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1042024: 1,2291082%
Drugs named by CMS: 44 in 2024, 8 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Guillermo Castillo offers telehealth to Medicare patients
CMS lists Dr. Castillo as offering telehealth.
- Offers telehealth
- Yes
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Guillermo Castillo received $9,062 in industry payments from 2016 to 2025
CMS Open Payments shows 129 general payments to Dr. Castillo from 19 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 86% of the total. Boston Scientific Corporation paid the most, $3,871.
General payments to Dr. Castillo by program year, 2016 to 2025
General payments to Dr. Castillo by kind, 2016 to 2025
- Food and beverage$7,75186%
- Travel and lodging$1,28114%
- Education$290%
Companies that paid Dr. Castillo the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Guillermo Castillo graduated from Keck School of Medicine of USC
Dr. Castillo graduated from Keck School of Medicine of USC in 2001.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Guillermo Castillo accepts plans from 1 insurance carrier
Dr. Castillo is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Guillermo Castillo's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Guillermo Castillo
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Guillermo Castillo's NPI number?
Dr. Guillermo Castillo's NPI number is 1366558322. It was assigned on August 22, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Guillermo Castillo?
Dr. Guillermo Castillo is a family medicine physician in San Diego, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Guillermo Castillo practice?
Dr. Castillo practices at 6755 Mira Mesa Blvd, San Diego, CA 92121. Dr. Castillo's primary practice is Precision Diagnostics in San Diego, California. Dmand AI also links Dr. Castillo to 4 physician offices, 4 home health agencies, 3 hospices and 1 group practice or clinic.
What is Dr. Guillermo Castillo's office phone number?
The practice phone on file for Dr. Castillo is (800) 635-6901.
What is Dr. Guillermo Castillo's medical license number?
Dr. Castillo holds California license A83282, one of the licenses on file in 8 states.
Which states has Dr. Guillermo Castillo been licensed in?
Dmand AI has state licenses on file for Dr. Castillo in California (2003 to 2027), New York (2021 to 2024), Virginia (2021 to 2024), Connecticut (2021 to 2023), Florida (2021 to 2023), Ohio (2021 to 2023), Maine (2021 to 2022) and Rhode Island (2021 to 2022).
What medical group is Dr. Guillermo Castillo part of?
Dr. Castillo is linked to Vital Care Health Group.
Does Dr. Guillermo Castillo accept Medicare?
Yes. CMS data shows Dr. Castillo billed Medicare for 27 services in 2024.
Does Dr. Guillermo Castillo offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Castillo as offering telehealth services.
How many Medicare patients does Dr. Guillermo Castillo see?
CMS counts 27 Medicare patients who saw Dr. Castillo in 2024, with an average age of 78.
Show 6 more questionsShow fewer questions
What services does Dr. Guillermo Castillo bill to Medicare?
In 2024, Dr. Castillo's most billed Medicare services were heart test or procedure (93229).
Where did Dr. Guillermo Castillo go to medical school?
Dr. Castillo graduated from Keck School of Medicine of USC in 2001.
What drugs does Dr. Guillermo Castillo prescribe most?
In 2024 Medicare Part D data, Dr. Castillo's most prescribed drugs by claims were Trazodone HCl, Atorvastatin Calcium and Amlodipine Besylate.
Has Dr. Guillermo Castillo received payments from drug or device companies?
CMS Open Payments shows $9,062 in general payments to Dr. Castillo from 19 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Guillermo Castillo been practicing?
Dr. Castillo graduated from medical school in 2001, 25 years ago.
What insurance does Dr. Guillermo Castillo accept?
Dr. Castillo is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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