Sean Leson, D.O.
NPI 1699733766 · Clinical & Laboratory Immunology (Allergy & Immunology) Physician · Garden Grove, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean Leson, D.O. is a Clinical & Laboratory Immunology (Allergy & Immunology) Physician provider in Garden Grove, CA (NPI 1699733766).
Provider details
- NPI number
- 1699733766
- Entity type
- Individual
- Primary specialty
- Clinical & Laboratory Immunology (Allergy & Immunology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A6461 (CA)
Specialties & taxonomies
- Clinical & Laboratory Immunology (Allergy & Immunology) PhysicianPrimary207KI0005XLicense 20A6461 (CA)
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
9,916 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Professional Service for Preparation and Provision of 1 Or More Antigens95165 | 3,990 | $17 |
| Test for Allergy Using Allergenic Extract95004 | 1,575 | $4 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 993 | $34 |
| Test for Allergy Using Allergenic Extract Injected Into Skin95024 | 725 | $9 |
| Professional Service for Multiple Injections of Allergen95117 | 402 | $14 |
| Inhalation Treatment for Acute Airway Obstruction, First Hour94644 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 115 | 21 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 113 | 20 |
| Montelukast Sodium | 88 | 20 |
| Flunisolide | 79 | 21 |
| Roflumilast | 65 | 15 |
| Levocetirizine Dihydrochloride | 30 | 14 |
| Prednisone | 28 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$138 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-01
- Last updated
- 2014-01-21
Frequently asked questions
- What is Sean Leson's NPI number?
- Sean Leson's National Provider Identifier (NPI) is 1699733766, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean Leson's specialty?
- Sean Leson is listed in the NPPES registry with a primary specialty of Clinical & Laboratory Immunology (Allergy & Immunology) Physician (Allopathic & Osteopathic Physicians).
- Where is Sean Leson located?
- Sean Leson's practice location on file with NPPES is 12512 Garden Grove Blvd, Garden Grove, CA 92843-1907.
- What is Sean Leson's phone number?
- The practice phone number listed in the NPPES registry for Sean Leson is (714) 590-1611.
- Does Sean Leson accept Medicare?
- Sean Leson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean Leson's NPI active?
- Yes — Sean Leson's NPI (1699733766) is active in the NPPES registry as of the last update on 2014-01-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.