NPPES file of Aug 9, 2026

Isabella Blair Ahrens, PHD

Psychologist · San Diego, CA

Isabella Blair Ahrens, PHD is a psychologist with a practice address in San Diego, California, and NPI 1871453043, issued on Nov 12, 2025. Check the license (California 36310, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1871453043
Name
Isabella Blair Ahrens
Credential
PHD
Primary taxonomy
Psychologist 103T00000X
License number
36310 CA
Self-reported in NPPES; status is on the state search
Practice location
3517 Camino Del Rio S Ste 302, San Diego, CA 92108
Phone
(619) 996-3195
Enumerated
Nov 12, 2025
Record last updated
Nov 19, 2025
Medicare enrollment
Enrolled (PECOS I20251222001672); may accept Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest psychologist records → All 7,304 in California → Look up another NPI →

Also registered at 3517 Camino Del Rio S Ste 302

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Alana ArguelloMarriage & Family Therapist1891819991
  2. Hosanna Bonn, PSYDPsychologist1306490560
  3. Sarah Chun, PHDClinical Psychologist1154141208
  4. Sonia Cobos, MS, APCCProfessional Counselor1760322499
  5. Melina DelisMarriage & Family Therapist1649148560
  6. Kelsey Fitzgerald, PSYDClinical Psychologist1679987846

Verify Isabella Blair Ahrens in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 36310    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Isabella Blair Ahrens among 7,304 psychologist records in California

Isabella Blair Ahrens, PHD is one of 7,304 psychologist records with a practice address in California. 6% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2025, is newer than 95% of them.

  • NPI issued2025 · 95% of these records are older, 2% newer
  • In a Medicare fileNo · 6% of these records are
  • In the CMS Doctors and Clinicians fileYes · 14% of these records are
  • Graduated2024 · median 2005 among the 1,058 with a school on file
  • Record last updated2025 · 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 103T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Psychologist providers in California

There are 7,304 psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 7,304 in California → Every provider in San Diego → Psychologist nationwide →

The 8 psychologist records with the nearest ZIP codes

  1. Niloofar Afari, PHDSan Diego, CA 921081275557621
  2. David Boucher, PH.D.San Diego, CA 921081518966340
  3. Alma Carpio, PSYDSan Diego, CA 921081245287267
  4. Angela Copeland, PSYDSan Diego, CA 921081235175316
  5. Marjan Davoudi, PSY.D.San Diego, CA 921081174575245
  6. Diedra Duchock, PHDSan Diego, CA 921081801843784
  7. Charles Ertl, PH.D.San Diego, CA 921081356375729
  8. Steven Hirsch, PHDSan Diego, CA 921081689688418

Common questions

What is Isabella Blair Ahrens, PHD's NPI number?

Isabella Blair Ahrens, PHD's National Provider Identifier (NPI) is 1871453043, issued on Nov 12, 2025. An NPI identifies a provider in billing; it is not a license.

Where is Isabella Blair Ahrens, PHD located?

The NPPES record lists a practice address at 3517 Camino Del Rio S Ste 302, San Diego, CA, 92108. Phone: (619) 996-3195. Providers update this record themselves, so call before visiting.

How can I verify Isabella Blair Ahrens, PHD's license?

NPPES lists California license number 36310, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.