Timothy I. Hsieh, MD
Endocrinology, Diabetes & Metabolism Physician · Los Angeles, CA
Timothy I. Hsieh, MD is an endocrinology, diabetes & metabolism physician with a practice address in Los Angeles, California, and NPI 1821157405, issued on Dec 8, 2006. Check the license (California G71934, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Timothy I. Hsieh
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- G71934 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6041 Cadillac Ave, Los Angeles, CA 90034
- Phone
- (323) 857-2000
- Enumerated
- Dec 8, 2006
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100607000856); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1990
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 6041 Cadillac Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Abedi, M.D.Emergency Medicine Physician1518320654
- Felicia Adiele, CNMAdvanced Practice Midwife1205984143
- Angeli Agatep, MDInternal Medicine Physician1194873067
- Roberto AguiluzRegistered Respiratory Therapist1184102675
- Jose Aguinada, DPTPhysical Therapist1356067151
- Blasius AgumPsychiatric/Mental Health Nurse Practitioner1063293207
Verify Timothy I. Hsieh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G71934Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
3,711 Medicare Part D claims for 666 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Levothyroxine Sodium900 claims
- Methimazole260 claims
- Humulin N147 claims
- Insulin Glargine-Yfgn129 claims
- Ozempic126 claims
- Nano 2nd Gen Pen Needle122 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy I. Hsieh among 1,131 endocrinology, diabetes & metabolism physician records in California
Timothy I. Hsieh, MD is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1990 · median 2003 among the 779 with a school on file
- Record last updated2021 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Los Angeles → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Jane Chu, M.D.Los Angeles, CA 900341609186881
- Braden Barnett, M.D.Los Angeles, CA 900331124386776
- Elizabeth BealeLos Angeles, CA 900331376745893
- John Carmichael, MDLos Angeles, CA 900331396818241
- Daniel De Moss, MDLos Angeles, CA 900331447593207
- Alyssa Dominguez, MDLos Angeles, CA 900331679936363
- Christian Gastelum, MDLos Angeles, CA 900331285782268
- Wei An Lee, D.O.Los Angeles, CA 900331205031804
Common questions
What is Timothy I. Hsieh, MD's NPI number?
Timothy I. Hsieh, MD's National Provider Identifier (NPI) is 1821157405, issued on Dec 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Timothy I. Hsieh, MD located?
The NPPES record lists a practice address at 6041 Cadillac Ave, Los Angeles, CA, 90034. Phone: (323) 857-2000. Providers update this record themselves, so call before visiting.
How can I verify Timothy I. Hsieh, MD's license?
NPPES lists California license number G71934, 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 Timothy I. Hsieh, MD prescribe under Medicare Part D?
In 2024, Timothy I. Hsieh, MD had 3,711 Medicare Part D claims for 666 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.