Eric M. Chen, MD
Allergy & Immunology Physician · Walnut Creek, CA
Eric M. Chen, MD is an allergy & immunology physician with a practice address in Walnut Creek, California, and NPI 1558440222, issued on Nov 3, 2006. Check the license (California A68015, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eric M. Chen
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- A68015 CA
Self-reported in NPPES; status is on the state search - Practice location
- 320 Lennon LN, Walnut Creek, CA 94598
- Phone
- (925) 906-2000
- Enumerated
- Nov 3, 2006
- Record last updated
- Dec 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A680150 CA
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 320 Lennon LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joel Acab, MDInternal Medicine Physician1518405661
- Vitas Alekna, MDOphthalmology Physician1770661860
- Mary Andre, P.T.Physical Therapist1740344779
- Lynn Arsenault, MDPediatrics Physician1972681054
- Ashley Batchelder, DPTPhysical Therapist1851450936
- Cynthia Bellitt, R.N.N.P.Women's Health Nurse Practitioner1851464630
Verify Eric M. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A68015Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
292 Medicare Part D claims for 89 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Azelastine Hcl68 claims
- Ipratropium Bromide66 claims
- Prednisone34 claims
- Levothyroxine Sodium20 claims
- Albuterol Sulfate Hfa17 claims
- Epinephrine13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $116.52
1 payment: food and beverage; the largest payer was Genentech USA, Inc. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Eric M. Chen among 444 allergy & immunology physician records in California
Eric M. Chen, MD is one of 444 allergy & immunology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2021 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in California
There are 444 allergy & immunology physician records in California.
All 444 in California → Every provider in Walnut Creek → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- David Cook, MDWalnut Creek, CA 945981740282425
- David Fan, MDWalnut Creek, CA 945981619596152
- Karna Gendo, M.D.Walnut Creek, CA 945981720164536
- Ilisten Jones, M.D., M.P.H.Walnut Creek, CA 945981407148943
- Toral Kamdar, M.D.Walnut Creek, CA 945981073776555
- Barbara Karpel, MDWalnut Creek, CA 945981033111729
- Matthew Lodewick, MDWalnut Creek, CA 945981922091362
- Nancy Mozelsio, MDWalnut Creek, CA 945981114910551
Common questions
What is Eric M. Chen, MD's NPI number?
Eric M. Chen, MD's National Provider Identifier (NPI) is 1558440222, issued on Nov 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Eric M. Chen, MD located?
The NPPES record lists a practice address at 320 Lennon LN, Walnut Creek, CA, 94598. Phone: (925) 906-2000. Providers update this record themselves, so call before visiting.
How can I verify Eric M. Chen, MD's license?
NPPES lists California license number A68015, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Eric M. Chen, MD prescribe under Medicare Part D?
In 2024, Eric M. Chen, MD had 292 Medicare Part D claims for 89 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions 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. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
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.