Terence Lee Ahern, MD
Emergency Medicine Physician · Palo Alto, CA
Terence Lee Ahern, MD is an emergency medicine physician with a practice address in Palo Alto, California, and NPI 1104195916, issued on Dec 22, 2011. Check the license (California A123764, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Terence Lee Ahern
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- A123764 CA
M-13191 ID
MD170843 OR
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Palo Alto, CA 94304
- Phone
- (650) 723-4000
- Enumerated
- Dec 22, 2011
- Record last updated
- Jul 5, 2024
- Medicare enrollment
- Enrolled (PECOS I20140821002390); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Terence Lee Ahern in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A123764Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% fewer Medicare Part D claims than the average emergency medicine physician in 2024
177 Medicare Part D claims for 126 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin35 claims
- Prednisone14 claims
- Azithromycin12 claims
- Ondansetron Odt12 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.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Terence Lee Ahern among 7,751 emergency medicine physician records in California
Terence Lee Ahern, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 60% of them.
- NPI issued2011 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2011 · median 2011 among the 4,560 with a school on file
- Record last updated2024 · 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 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Palo Alto → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Christopher Evans, D.O.Palo Alto, CA 943041902227788
- Tonia Fox, MDPalo Alto, CA 943041023050242
- William Johnston, M.D.Palo Alto, CA 943041417366584
- Derrick Lung, MDPalo Alto, CA 943041821259342
- Anne Merritt, M.D.Palo Alto, CA 943041730322967
- Robert Norris, M.D.Palo Alto, CA 943041124177928
- Sabrina Pak, MDPalo Alto, CA 943041548332018
- Zina Semenovskaya, MDPalo Alto, CA 943041255560181
Common questions
What is Terence Lee Ahern, MD's NPI number?
Terence Lee Ahern, MD's National Provider Identifier (NPI) is 1104195916, issued on Dec 22, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Terence Lee Ahern, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Palo Alto, CA, 94304. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Terence Lee Ahern, MD's license?
NPPES lists California license number A123764, 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 Terence Lee Ahern, MD prescribe under Medicare Part D?
In 2024, Terence Lee Ahern, MD had 177 Medicare Part D claims for 126 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.