Elaine Ji-Yun Deemer, DO
Geriatric Medicine (Internal Medicine) Physician · Torrance, CA
Elaine Ji-Yun Deemer, DO is a geriatric medicine (internal medicine) physician with a practice address in Torrance, California, and NPI 1649856162, issued on Mar 23, 2021. Check the license (California 1649856162, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Elaine Ji-Yun Deemer
- Credential
- DO
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 1649856162 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3400 Lomita Blvd Ste 500, Torrance, CA 90505
- Phone
- (310) 325-9110
- Enumerated
- Mar 23, 2021
- Record last updated
- Sep 7, 2025
- Medicare enrollment
- Enrolled (PECOS I20250820003210); accepts Medicare assignment
- Medical or professional school
- Liberty Univ College Of Osteopathic Medicine, 2021
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Verify Elaine Ji-Yun Deemer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 1649856162Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
131 Medicare Part D claims for 26 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D.
Most prescribed
- Losartan Potassium14 claims
- Atorvastatin Calcium11 claims
- Levothyroxine Sodium11 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.
Industry payments in 2024: $18.53
1 payment: food and beverage; the largest payer was Alkermes, Inc. The 1,004 providers of this specialty with any payment received $1,720.82 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Torrance Health Association IncTorrance, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Elaine Ji-Yun Deemer among 532 geriatric medicine (internal medicine) physician records in California
Elaine Ji-Yun Deemer, DO 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 2021, is newer than 95% of them.
- NPI issued2021 · 95% of these records are older, 3% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2021 · median 1999 among the 271 with a school on file
- Record last updated2025 · 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 Torrance → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Marcil Mamita, MDTorrance, CA 905051962412718
- Abriella Demanes, MDTorrance, CA 905021669036695
- Mailee Hess, MDTorrance, CA 905021396011565
- Christopher Mayorga, DOTorrance, CA 905021003445669
- Kushi Mehrotra, MDTorrance, CA 905021679627889
- William Welsh, D.O.Whittier, CA 906021568401255
- Kenneth Waltzer, M.D.Santa Monica, CA 904051437424090
- Edward Hui, MDSanta Monica, CA 904041184657488
Common questions
What is Elaine Ji-Yun Deemer, DO's NPI number?
Elaine Ji-Yun Deemer, DO's National Provider Identifier (NPI) is 1649856162, issued on Mar 23, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Elaine Ji-Yun Deemer, DO located?
The NPPES record lists a practice address at 3400 Lomita Blvd Ste 500, Torrance, CA, 90505. Phone: (310) 325-9110. Providers update this record themselves, so call before visiting.
How can I verify Elaine Ji-Yun Deemer, DO's license?
NPPES lists California license number 1649856162, 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 Elaine Ji-Yun Deemer, DO prescribe under Medicare Part D?
In 2024, Elaine Ji-Yun Deemer, DO had 131 Medicare Part D claims for 26 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.