Jeffrey De Castro Mariano, MD
Geriatric Medicine (Internal Medicine) Physician · Los Angeles, CA
Jeffrey De Castro Mariano, MD is a geriatric medicine (internal medicine) physician with a practice address in Los Angeles, California, and NPI 1750300521, issued on Jul 19, 2006. Check the license (California A81061, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jeffrey De Castro Mariano
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A81061 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3699 Wilshire Blvd, Los Angeles, CA 90010
- Phone
- (323) 783-1490
- Enumerated
- Jul 19, 2006
- Record last updated
- Dec 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (323) 783-4120
- Medicaid ID
- 00A810610 CA
- Medicare enrollment
- Enrolled (PECOS I20050930000842); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 3699 Wilshire Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hae-Kyung Cho, R.N., N.P.Gerontology Nurse Practitioner1952432049
- Kraig Depriest, RPTPhysical Therapist1649494675
- Jemma Kim, P.T.Physical Therapist1326265075
- Daniel Moldenhauer, LCSWClinical Social Worker1508085606
- Carmen Popica, RPTPhysical Therapist1528285731
- Margreet Ray, RPTPhysical Therapist1841416294
Verify Jeffrey De Castro Mariano in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A81061Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
908 Medicare Part D claims for 218 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. 21 claims were for opioids.
Most prescribed
- Atorvastatin Calcium53 claims
- Amlodipine Besylate44 claims
- Eliquis35 claims
- Escitalopram Oxalate35 claims
- Duloxetine Hcl28 claims
- Finasteride28 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
- Southern California Permanente Medical GroupLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jeffrey De Castro Mariano among 532 geriatric medicine (internal medicine) physician records in California
Jeffrey De Castro Mariano, MD is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 46% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2001 · median 1999 among the 271 with a school on file
- Record last updated2021 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in Los Angeles → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Angela Moore-HodgeLos Angeles, CA 900101295932937
- Rafael Salas Martinez, M.D.Los Angeles, CA 900101396754321
- Carol Thrun, MDLos Angeles, CA 900111891764536
- Chaivat Phuvadakorn, M.D.Los Angeles, CA 900121164793816
- Dong Lee, M.D.Los Angeles, CA 900061134109200
- Victor Oranusi, M.D.Los Angeles, CA 900031336246065
- Sarah Gelberd, MDLos Angeles, CA 900201265513436
- Seung Kim, M.D.Los Angeles, CA 900201134153653
Common questions
What is Jeffrey De Castro Mariano, MD's NPI number?
Jeffrey De Castro Mariano, MD's National Provider Identifier (NPI) is 1750300521, issued on Jul 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey De Castro Mariano, MD located?
The NPPES record lists a practice address at 3699 Wilshire Blvd, Los Angeles, CA, 90010. Phone: (323) 783-1490. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey De Castro Mariano, MD's license?
NPPES lists California license number A81061, 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 Jeffrey De Castro Mariano, MD prescribe under Medicare Part D?
In 2024, Jeffrey De Castro Mariano, MD had 908 Medicare Part D claims for 218 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.