NPPES file of Aug 9, 2026

Andrew A. Chen, M.D.

Urology Physician · Walnut Creek, CA

Andrew A. Chen, M.D. is a urology physician with a practice address in Walnut Creek, California, and NPI 1811039480, issued on Feb 12, 2007. Check the license (California A80210, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1811039480
Name
Andrew A. Chen
Credential
M.D.
Primary taxonomy
Urology Physician 208800000X
License numbers
A80210 CA
238799 NY
Self-reported in NPPES; status is on the state search
Practice location
1425 S Main St, Walnut Creek, CA 94596
Phone
(310) 869-6386
Enumerated
Feb 12, 2007
Record last updated
Feb 11, 2022
Medicare enrollment
Enrolled (PECOS I20071116000622); accepts Medicare assignment
Medical or professional school
University Of Southern California Keck School Of Medicine, 2000
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest urology physician records → All 1,524 in California → Look up another NPI →

Also registered at 1425 S Main St

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

  1. Eric AaserudeEmergency Medicine Physician1811491194
  2. Derek Abbassi, MDObstetrics & Gynecology Physician1841364155
  3. Peter Ackerman, MDEmergency Medicine Physician1427435023
  4. Aaron Mark Acosta, DOEmergency Medicine Physician1538789987
  5. Basil Adad, MDOtolaryngology Physician1487732574
  6. Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804

Verify Andrew A. Chen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A80210    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
Open 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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9% more Medicare Part D claims than the average urology physician in 2024

1,459 Medicare Part D claims for 425 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. 54 claims were for opioids.

  1. Andrew Chen1,459
  2. Specialty average1,340

Most prescribed

  1. Finasteride438 claims
  2. Tamsulosin Hcl404 claims
  3. Trospium Chloride98 claims
  4. Terazosin Hcl68 claims
  5. Ciprofloxacin Hcl62 claims
  6. Hydrocodone-Acetaminophen40 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: $174.13

1 payment: food and beverage; the largest payer was Sumitomo Pharma America, Inc. The 9,340 providers of this specialty with any payment received $3,800.04 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Andrew Chen$174.13
  2. Specialty average$3,800.04

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Permanente Medical Group IncWalnut Creek, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Andrew A. Chen among 1,524 urology physician records in California

Andrew A. Chen, M.D. is one of 1,524 urology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 49% of them.

  • NPI issued2007 · 49% of these records are older, 40% newer
  • In a Medicare fileYes · 82% of these records are
  • In the CMS Doctors and Clinicians fileYes · 69% of these records are
  • Graduated2000 · median 2003 among the 1,049 with a school on file
  • Record last updated2022 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Urology Physician providers in California

There are 1,524 urology physician records in California.

All 1,524 in California → Every provider in Walnut Creek → Urology Physician nationwide →

The 8 urology physician records with the nearest ZIP codes

  1. Amir Arsanjani, MDWalnut Creek, CA 945961154486793
  2. Michael Choi, MDWalnut Creek, CA 945961215015797
  3. Jason Frankel, MDWalnut Creek, CA 945961750729976
  4. Scot Hagey, MDWalnut Creek, CA 945961215015896
  5. Gregory Marshall, MDWalnut Creek, CA 945961437237526
  6. John Oh, MDWalnut Creek, CA 945961649358730
  7. Raymond Rosenbaum, MDWalnut Creek, CA 945961679651749
  8. Malcolm Scott, MDWalnut Creek, CA 945961750469854

Common questions

What is Andrew A. Chen, M.D.'s NPI number?

Andrew A. Chen, M.D.'s National Provider Identifier (NPI) is 1811039480, issued on Feb 12, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Andrew A. Chen, M.D. located?

The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (310) 869-6386. Providers update this record themselves, so call before visiting.

How can I verify Andrew A. Chen, M.D.'s license?

NPPES lists California license number A80210, 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 Andrew A. Chen, M.D. prescribe under Medicare Part D?

In 2024, Andrew A. Chen, M.D. had 1,459 Medicare Part D claims for 425 beneficiaries; the average among urology physician prescribers was 1,340. 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.

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.