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Allergy/Immunology

Sean Leson, DO

Sees patients in Garden Grove, CA · California

Summary

Sean Leson, DO (Allergy/Immunology) is enrolled with Medicare at 1 practice location in Garden Grove, CA. NPI 1699733766. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(714) 590‑1611 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Sean Leson, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

1Practice location
Allergy/ImmunologyPrimary specialty
YesAccepts Medicare assignment
37Years since medical school (graduated 1989)
At Still University Of Health Sciences, College Of Osteo Med, KirksvilleMedical school
MaleGender (as listed)

Quick answers

Where does Sean Leson see patients?
Medicare's clinician data lists 1 practice location in Garden Grove, CA. Call before your visit to confirm the address.
What is Sean Leson's specialty?
Medicare lists Allergy/Immunology as the primary specialty, and also Internal Medicine.
Does Sean Leson accept Medicare assignment?
Yes. Medicare's clinician data says Sean Leson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
What is the phone number for Sean Leson?
(714) 590-1611, as listed in official Medicare / NPI Registry data.
What is Sean Leson's NPI number?
1699733766. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Sean Leson is enrolled with Medicare (CMS data updated 2026-10-02).

Specialties

Find other Allergy/Immunology doctors in California →

Other allergist and immunologists in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

All allergist and immunologists in California →

Clinician information

CredentialDO
Medical schoolAt Still University Of Health Sciences, College Of Osteo Med, Kirksville
Graduation year1989
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1699733766
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians