James Ahern, MD
NPI 1508359423 · Family Medicine Physician · Ventura, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Ahern, MD is a Family Medicine Physician provider in Ventura, CA (NPI 1508359423).
Provider details
- NPI number
- 1508359423
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
2,297 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 542 | $104 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 452 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 386 | $66 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 201 | $74 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 145 | $9 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 93 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 283 | 84 |
| Levothyroxine Sodium | 156 | 50 |
| Tamsulosin Hcl | 155 | 50 |
| Losartan Potassium | 143 | 51 |
| Rosuvastatin Calcium | 139 | 48 |
| Amlodipine Besylate | 137 | 41 |
| Trazodone Hcl |
Practice location
Mailing address
Additional practice locations (1)
- 300 Hillmont Ave, Bldg 340, Suite 201Ventura, CA 93003Phone: (805) 652-6100Fax: (805) 652-3252
Registry dates
- Enumerated
- 2018-06-14
- Last updated
- 2021-09-28
- Certified
- 2021-09-28
Frequently asked questions
- What is James Ahern's NPI number?
- James Ahern's National Provider Identifier (NPI) is 1508359423, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Ahern's specialty?
- James Ahern is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Ahern located?
- James Ahern's practice location on file with NPPES is 6633 Telephone Rd Ste 100, Ventura, CA 93003-5569.
- What is James Ahern's phone number?
- The practice phone number listed in the NPPES registry for James Ahern is (805) 644-9121.
- Does James Ahern accept Medicare?
- James Ahern is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Ahern's NPI active?
- Yes — James Ahern's NPI (1508359423) is active in the NPPES registry as of the last update on 2021-09-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.