Lily Helena Ostrer, MD
Infectious Disease Physician · San Diego, CA
Lily Helena Ostrer, MD is an infectious disease physician with a practice address in San Diego, California, and NPI 1821592155, issued on Mar 21, 2018. Check the license (California A186619, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Lily Helena Ostrer
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License numbers
- A186619 CA
ME156022 FL
Self-reported in NPPES; status is on the state search - Practice location
- 9500 Gilman Dr, San Diego, CA 92093
- Phone
- (619) 543-3995
- Enumerated
- Mar 21, 2018
- Record last updated
- May 20, 2026
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Verify Lily Helena Ostrer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A186619Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average infectious disease physician in 2024
11 Medicare Part D claims, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Lily Helena Ostrer among 1,119 infectious disease physician records in California
Lily Helena Ostrer, MD is one of 1,119 infectious disease 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 2018, is newer than 90% of them.
- NPI issued2018 · 90% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in San Diego → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Jennifer Dan, M.D., PH.D.La Jolla, CA 920931225343601
- Mary Lewinski, M.D., PH.D.La Jolla, CA 920931659535094
- Samuel Bozzette, MD, PHDSan Diego, CA 921011992893929
- Joseph Caperna, M.D.San Diego, CA 921011720141153
- George Sakoulas, MDSan Diego, CA 921011184647893
- Ted Gay, MDVista, CA 920841043382104
- Steve Kuriyama, MDVista, CA 920841962412981
- Richard Smith, MDVista, CA 920841518979228
Common questions
What is Lily Helena Ostrer, MD's NPI number?
Lily Helena Ostrer, MD's National Provider Identifier (NPI) is 1821592155, issued on Mar 21, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Lily Helena Ostrer, MD located?
The NPPES record lists a practice address at 9500 Gilman Dr, San Diego, CA, 92093. Phone: (619) 543-3995. Providers update this record themselves, so call before visiting.
How can I verify Lily Helena Ostrer, MD's license?
NPPES lists California license number A186619, 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 Lily Helena Ostrer, MD prescribe under Medicare Part D?
In 2024, Lily Helena Ostrer, MD had 11 Medicare Part D claims; the average among infectious disease physician prescribers was 689. 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.