NPPES file of Aug 9, 2026

Stefan Haller, M.D.

Specialist · Fremont, CA

Stefan Haller, M.D. is a specialist with a practice address in Fremont, California, and NPI 1841232337, issued on Jun 11, 2006. Check the license (California C51503, 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
1841232337
Name
Stefan Haller
Credential
M.D.
Primary taxonomy
Specialist 174400000X
License number
C51503 CA
Self-reported in NPPES; status is on the state search
Practice location
39400 Paseo Padre Pkwy, Fremont, CA 94538
Phone
(510) 784-4000
Enumerated
Jun 11, 2006
Record last updated
Dec 9, 2021 (not updated in 5 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest specialist records → All 5,749 in California → Look up another NPI →

Also registered at 39400 Paseo Padre Pkwy

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

  1. Denise Agatep, LCSWCounselor1164584900
  2. Ujwala Agharkar, MDChild & Adolescent Psychiatry Physician1073685723
  3. Dolly Ahluwalia, RDRegistered Dietitian1659429157
  4. Tabassum Alam, MDHospitalist Physician1306921069
  5. Mary Alyono, MDAnesthesiology Physician1477631059
  6. Stephanie Aoki, PHDPsychologist1427721216

Verify Stefan Haller 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 C51503    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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Stefan Haller among 5,749 specialist records in California

Stefan Haller, M.D. is one of 5,749 specialist records with a practice address in California. 30% 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 2006, is newer than 7% of them.

  • NPI issued2006 · 7% of these records are older, 60% newer
  • In a Medicare fileNo · 30% of these records are
  • In the CMS Doctors and Clinicians fileNo · 19% of these records are
  • Record last updated2021 · 77% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Specialist providers in California

There are 5,749 specialist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 5,749 in California → Every provider in Fremont → Specialist nationwide →

The 8 specialist records with the nearest ZIP codes

  1. Michael Bastasch, MDFremont, CA 945381912962028
  2. Chia-Hui Chen, BSFremont, CA 945381083748289
  3. Jye-Shern Cheng, M.D.Fremont, CA 945381598729287
  4. John Jaureguito, MDFremont, CA 945381013044601
  5. Mimi Lin, M.D.Fremont, CA 945381386608065
  6. Stephen Nguyen, MDFremont, CA 945381912022443
  7. Urvashi Patel, P.T.Fremont, CA 945381477640852
  8. Pramela Ramachandran, MDFremont, CA 945381811022528

Common questions

What is Stefan Haller, M.D.'s NPI number?

Stefan Haller, M.D.'s National Provider Identifier (NPI) is 1841232337, issued on Jun 11, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Stefan Haller, M.D. located?

The NPPES record lists a practice address at 39400 Paseo Padre Pkwy, Fremont, CA, 94538. Phone: (510) 784-4000. Providers update this record themselves, so call before visiting.

How can I verify Stefan Haller, M.D.'s license?

NPPES lists California license number C51503, 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.