Cesar Castillo, MD
Hospitalist Physician · Santa Cruz, CA
Cesar Castillo, MD is a hospitalist physician with a practice address in Santa Cruz, California, and NPI 1578735148, issued on Mar 24, 2008. Check the license (California A100518, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cesar Castillo
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A100518 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1661 Soquel Dr Ste D, Santa Cruz, CA 95065
- Phone
- (831) 479-6603
- Enumerated
- Mar 24, 2008
- Record last updated
- Mar 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20081202000320); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2005
- Entity
- Type 1 · individual
Also registered at 1661 Soquel Dr Ste D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Boggs, ACNPAcute Care Nurse Practitioner1679919138
- William Cao, MDHospitalist Physician1932189529
- Rodrigo Cordero-Pangrazio, M.D.Hospitalist Physician1033571161
- Laura Hallahan, M.D.Hospitalist Physician1093155756
- Richard Hamner, MDHospitalist Physician1588660401
- David Hayward, M.D.Internal Medicine Physician1447368576
Verify Cesar Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A100518Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average hospitalist physician in 2024
224 Medicare Part D claims for 109 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 15 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass27 claims
- Eliquis16 claims
- Prednisone15 claims
- Doxycycline Hyclate14 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationSanta Cruz, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
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- Elijah AbdelmeseehLong Beach, CA1346827631
- Homayoun Abdollahzadeh, M.D.Rancho Mirage, CA1871802454
- Wajidah Abdul-KhabirDuarte, CA1215323522
- Rizwana Abdullah, MDRoseville, CA1194899401
Common questions
What is Cesar Castillo, MD's NPI number?
Cesar Castillo, MD's National Provider Identifier (NPI) is 1578735148, issued on Mar 24, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Cesar Castillo, MD located?
The NPPES record lists a practice address at 1661 Soquel Dr Ste D, Santa Cruz, CA, 95065. Phone: (831) 479-6603. Providers update this record themselves, so call before visiting.
How can I verify Cesar Castillo, MD's license?
NPPES lists California license number A100518, 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 Cesar Castillo, MD prescribe under Medicare Part D?
In 2024, Cesar Castillo, MD had 224 Medicare Part D claims for 109 beneficiaries; the average among hospitalist physician prescribers was 521. 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.
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.