Eric Chen, MD
NPI 1558440222 · Allergy & Immunology Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Eric Chen, MD is a Allergy & Immunology Physician provider in Walnut Creek, CA (NPI 1558440222).
Provider details
- NPI number
- 1558440222
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A68015 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 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 | 68 | 24 |
| Ipratropium Bromide | 66 | 30 |
| Prednisone | 34 | 22 |
| Levothyroxine Sodium | 20 | — |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 17 | — |
| Fluticasone Propionate | 13 | — |
| Epinephrine | 13 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$117 across 1 record (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
- 2006-11-03
- Last updated
- 2021-12-06
Frequently asked questions
- What is Eric Chen's NPI number?
- Eric Chen's National Provider Identifier (NPI) is 1558440222, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Eric Chen's specialty?
- Eric Chen is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Eric Chen located?
- Eric Chen's practice location on file with NPPES is 320 Lennon Ln, Walnut Creek, CA 94598-2419.
- What is Eric Chen's phone number?
- The practice phone number listed in the NPPES registry for Eric Chen is (925) 906-2000.
- Does Eric Chen accept Medicare?
- Eric Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Eric Chen's NPI active?
- Yes — Eric Chen's NPI (1558440222) is active in the NPPES registry as of the last update on 2021-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.