Frank P. Castillo Jr., NP
- Part D claims, 2024
- 18
- Hospital affiliations
- 2
- Industry payments
- $124
- Medical group
- 1
- State license
- 1
- Practice address
- 100 N Wiget Lane #140, Walnut Creek, CA 94598
- Practice phone
- Call (925) 478-5444
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
DISC Surgery Center at Walnut Creek
Surgery Center - Medicare-Certified · Walnut Creek, California
Find Frank 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.
Frank P. Castillo Jr. is a nurse practitioner in Walnut Creek, California
Frank Castillo practices at DISC Surgery Center at Walnut Creek in Walnut Creek, California.
Frank Castillo's NPI, 1639623770, was assigned on August 5, 2016. Frank Castillo holds California license 95004634.
- NPI
- 1639623770NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113201377
- NPI enumeration date
- August 5, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (925) 478-5444
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Frank P. Castillo Jr. practices at DISC Surgery Center at Walnut Creek in Walnut Creek, California
Frank Castillo's primary practice is DISC Surgery Center at Walnut Creek, at 100 N Wiget Lane #140, Walnut Creek, CA 94598. The practice phone is (925) 478-5444.
- DISC Surgery Center at Walnut Creek100 N Wiget Lane #140, Walnut Creek, CA 94598Phone(925) 478-5444
Source: Dmand AI Affiliation Data
Frank P. Castillo Jr. is affiliated with 4 sites of care and 1 medical group
Frank Castillo's primary practice is DISC Surgery Center at Walnut Creek in Walnut Creek, California. Frank Castillo is also affiliated with John Muir Medical Center, Walnut Creek. The medical group on file is John Muir Medical Group. Dmand AI also links Frank Castillo to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Frank P. Castillo Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Frank Castillo practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| DISC Surgery Center at Walnut Creek | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Frank P. Castillo Jr. is one of 5,983 nurse practitioners in California
Nurse practitioner is Frank Castillo's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Frank Castillo is licensed in California.
Specialties and state licenses
- Nurse practitioner, CaliforniaPrimary
Nurse practitioners near Frank Castillo
Counts of nurse practitioners 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
Frank P. Castillo Jr.'s patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Frank Castillo's median patient age at 69, with 30% women.
Frank 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 69
Patient panel by sex, all payers
- Women30%
- Men68%
Source: Dmand AI Patient Panel Data
Frank P. Castillo Jr. wrote 18 Medicare Part D claims in 2024
In 2024, Frank Castillo wrote 18 Medicare Part D claims. 100% of them were for generic drugs.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Frank P. Castillo Jr. offers telehealth to Medicare patients
Frank Castillo accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Frank Castillo as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Frank P. Castillo Jr. received $124 in industry payments in 2025
CMS Open Payments shows 8 general payments to Frank Castillo from 4 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $50.
Companies that paid Frank Castillo the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Frank P. Castillo Jr.'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Frank P. Castillo Jr.
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Frank P. Castillo Jr.'s NPI number?
Frank P. Castillo Jr.'s NPI number is 1639623770. It was assigned on August 5, 2016, and it is active in the NPI Registry.
What does Frank P. Castillo Jr. specialize in?
Frank P. Castillo Jr. is a nurse practitioner in Walnut Creek, California. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Frank P. Castillo Jr. practice?
Frank Castillo practices at 100 N Wiget Lane #140, Walnut Creek, CA 94598. Frank Castillo's primary practice is DISC Surgery Center at Walnut Creek in Walnut Creek, California. Dmand AI also links Frank Castillo to 1 hospital and 1 group practice or clinic.
What is Frank P. Castillo Jr.'s office phone number?
The practice phone on file for Frank Castillo is (925) 478-5444.
What is Frank P. Castillo Jr.'s medical license number?
Frank Castillo holds California license 95004634.
Which hospitals is Frank P. Castillo Jr. affiliated with?
Frank Castillo is affiliated with John Muir Medical Center, Walnut Creek. Dmand AI links Frank Castillo to 1 more hospital.
What medical group is Frank P. Castillo Jr. part of?
Frank Castillo is linked to John Muir Medical Group.
Does Frank P. Castillo Jr. accept Medicare?
Yes. CMS lists Frank Castillo as accepting Medicare assignment.
Does Frank P. Castillo Jr. offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Frank Castillo as offering telehealth services.
Has Frank P. Castillo Jr. received payments from drug or device companies?
CMS Open Payments shows $124 in general payments to Frank Castillo from 4 companies from 2025 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Frank P. Castillo Jr. been practicing?
Frank Castillo graduated from medical school in 2016, 10 years ago.
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