Tommy Ho-Yin Chen, M.D.
Dermatology Physician · Pasadena, CA
Tommy Ho-Yin Chen, M.D. is a dermatology physician with a practice address in Pasadena, California, and NPI 1326136854, issued on Oct 10, 2006. Check the license (California C37340, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tommy Ho-Yin Chen
- Credential
- M.D.
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- C37340 CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 Bellefontaine St, Pasadena, CA 91105
- Phone
- (626) 793-4857
- Enumerated
- Oct 10, 2006
- Record last updated
- Apr 24, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (626) 793-8812
- Medicaid ID
- 00C373400 CA
- Medicare enrollment
- Enrolled (PECOS I20081219000184); accepts Medicare assignment
- Medical or professional school
- Emory University School Of Medicine, 1974
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 2,083 in California → Look up another NPI →
Also registered at 50 Bellefontaine St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Tommy Ho-Yin Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C37340Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% fewer Medicare Part D claims than the average dermatology physician in 2024
411 Medicare Part D claims for 153 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Ketoconazole81 claims
- Mometasone Furoate70 claims
- Hydrocortisone47 claims
- Clobetasol Propionate33 claims
- Doxycycline Hyclate26 claims
- Levocetirizine Dihydrochloride17 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: $91.53
3 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 10,250 providers of this specialty with any payment received $8,544.61 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.
Tommy Ho-Yin Chen among 2,083 dermatology physician records in California
Tommy Ho-Yin Chen, M.D. is one of 2,083 dermatology physician records with a practice address in California. 83% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 56% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1974 · median 2006 among the 1,450 with a school on file
- Record last updated2008 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in California
There are 2,083 dermatology physician records in California.
All 2,083 in California → Every provider in Pasadena → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Heather Butler, MDPasadena, CA 911051417927419
- Janice Davolio, M.D.Pasadena, CA 911051972527521
- Sara Gaspard, M.D.Pasadena, CA 911051023253473
- Christiaan Hallman, M.D.Pasadena, CA 911051154313732
- Yuri Kim, D.O.Pasadena, CA 911051841606076
- Phillip Lee, M.D.Pasadena, CA 911051578628731
- Taraneh Matin, D.O.Pasadena, CA 911051528508876
- Marion Quinn, MDPasadena, CA 911051902876907
Common questions
What is Tommy Ho-Yin Chen, M.D.'s NPI number?
Tommy Ho-Yin Chen, M.D.'s National Provider Identifier (NPI) is 1326136854, issued on Oct 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tommy Ho-Yin Chen, M.D. located?
The NPPES record lists a practice address at 50 Bellefontaine St, Pasadena, CA, 91105. Phone: (626) 793-4857. Providers update this record themselves, so call before visiting.
How can I verify Tommy Ho-Yin Chen, M.D.'s license?
NPPES lists California license number C37340, 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 Tommy Ho-Yin Chen, M.D. prescribe under Medicare Part D?
In 2024, Tommy Ho-Yin Chen, M.D. had 411 Medicare Part D claims for 153 beneficiaries; the average among dermatology physician prescribers was 797. 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.