James Ahern, MD
Family Medicine Physician · Ventura, CA
James Ahern, MD is a family medicine physician with a practice address in Ventura, California, and NPI 1508359423, issued on Jun 14, 2018. Check the license (California A164158, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Ahern
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A164158 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6633 Telephone RD Ste 100, Ventura, CA 93003
- Phone
- (805) 644-9121
- Enumerated
- Jun 14, 2018
- Record last updated
- Sep 28, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210624001272); accepts Medicare assignment
- Medical or professional school
- F H Netter, M.D. School Of Med At Quinnipiac Univ, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 6633 Telephone RD Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Ahern in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A164158Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% more Medicare Part D claims than the average family medicine physician in 2024
4,514 Medicare Part D claims for 464 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 119 claims were for opioids.
Most prescribed
- Atorvastatin Calcium283 claims
- Levothyroxine Sodium156 claims
- Tamsulosin Hcl155 claims
- Losartan Potassium143 claims
- Rosuvastatin Calcium139 claims
- Amlodipine Besylate137 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
- The Regents OF The University OF CaliforniaThousand Oaks, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Ahern among 17,133 family medicine physician records in California
James Ahern, MD is one of 17,133 family 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 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
234 family medicine physician records list a practice address in Ventura
They are 234 of the 4,435 NPPES records with a practice address in Ventura, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Ventura → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Charles Adams, M.D.Ventura, CA 930031811925225
- Veronica Butler, M.D.Ventura, CA 930031063472736
- Eric Chun, M.D.Ventura, CA 930031699702381
- Michelle Daucett, D.O.Ventura, CA 930031003873035
- Derrick Dcosta, M.D.Ventura, CA 930031487699005
- James Hermann, M.D.Ventura, CA 930031861442899
- Theodore Hole, M.D.Ventura, CA 930031104873611
- Andrew Kerr, M.D.Ventura, CA 930031487695078
Common questions
What is James Ahern, MD's NPI number?
James Ahern, MD's National Provider Identifier (NPI) is 1508359423, issued on Jun 14, 2018. An NPI identifies a provider in billing; it is not a license.
Where is James Ahern, MD located?
The NPPES record lists a practice address at 6633 Telephone RD Ste 100, Ventura, CA, 93003. Phone: (805) 644-9121. Providers update this record themselves, so call before visiting.
How can I verify James Ahern, MD's license?
NPPES lists California license number A164158, 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 James Ahern, MD prescribe under Medicare Part D?
In 2024, James Ahern, MD had 4,514 Medicare Part D claims for 464 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.