Ivy Semenez, M.D.
Internal Medicine Physician · Lancaster, CA
Ivy Semenez, M.D. is an internal medicine physician with a practice address in Lancaster, California, and NPI 1114154291, issued on Jun 16, 2009. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ivy Semenez
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 43112 15TH St W, Lancaster, CA 93534
- Phone
- (877) 554-4404
- Enumerated
- Jun 16, 2009
- Record last updated
- Dec 14, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120919000790); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 43112 15TH St W
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ivy Semenez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% more Medicare Part D claims than the average internal medicine physician in 2024
4,768 Medicare Part D claims for 885 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 259 claims were for opioids.
Most prescribed
- Atorvastatin Calcium375 claims
- Lisinopril279 claims
- Amlodipine Besylate232 claims
- Levothyroxine Sodium221 claims
- Losartan Potassium190 claims
- Metformin Hcl156 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 GroupPanorama City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ivy Semenez among 17,696 internal medicine physician records in California
Ivy Semenez, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
55 internal medicine physician records list a practice address in Lancaster
They are 55 of the 4,273 NPPES records with a practice address in Lancaster, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Lancaster → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Harihar Agarwal, M.D.Lancaster, CA 935341215964150
- Naili Chen, D.O., MPH, MASCLancaster, CA 935341649251661
- Anthony Dulgeroff, M.D.Lancaster, CA 935341720199763
- Antony Fung, MDLancaster, CA 935341477526846
- Miranda Gaw, MDLancaster, CA 935341891705885
- Marvin Ginsburg, M.D.Lancaster, CA 935341508976580
- Shahid Hassan, M.D.Lancaster, CA 935341851401988
- Charles Lim, M.D.Lancaster, CA 935341205947231
Common questions
What is Ivy Semenez, M.D.'s NPI number?
Ivy Semenez, M.D.'s National Provider Identifier (NPI) is 1114154291, issued on Jun 16, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Ivy Semenez, M.D. located?
The NPPES record lists a practice address at 43112 15TH St W, Lancaster, CA, 93534. Phone: (877) 554-4404. Providers update this record themselves, so call before visiting.
How can I verify Ivy Semenez, M.D.'s license?
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 Ivy Semenez, M.D. prescribe under Medicare Part D?
In 2024, Ivy Semenez, M.D. had 4,768 Medicare Part D claims for 885 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.