Ernest S. Han, MD
Gynecologic Oncology Physician · Duarte, CA
Ernest S. Han, MD is a gynecologic oncology physician with a practice address in Duarte, California, and NPI 1639247950, issued on Dec 4, 2006. Check the license (California A85994, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ernest S. Han
- Credential
- MD
- Primary taxonomy
- Gynecologic Oncology Physician 207VX0201X
- License number
- A85994 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 E Duarte Road, Duarte, CA 91010
- Phone
- (626) 256-4673
- Enumerated
- Dec 4, 2006
- Record last updated
- Nov 27, 2023
- Fax
- (626) 408-3911
- Medicare enrollment
- Enrolled (PECOS I20040809000705); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical Branch At Galveston, 2000
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gynecologic oncology physician records → All 176 in California → Look up another NPI →
Also registered at 1500 E Duarte Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ernest S. Han in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A85994Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average gynecologic oncology physician in 2024
84 Medicare Part D claims for 47 beneficiaries, against an average of 195 among the 1,475 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 12 claims were for opioids.
Most prescribed
- Clobetasol Propionate12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 99.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $194.51
8 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 1,199 providers of this specialty with any payment received $6,387.20 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.
Bills Medicare through one group practice
- City OF Hope Medical FoundationDuarte, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ernest S. Han among 176 gynecologic oncology physician records in California
Ernest S. Han, MD is one of 176 gynecologic oncology physician records with a practice address in California. 86% 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, 55% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2000 · median 2004 among the 131 with a school on file
- Record last updated2023 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VX0201X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gynecologic Oncology Physician providers in California
There are 176 gynecologic oncology physician records in California.
All 176 in California → Every provider in Duarte → Gynecologic Oncology Physician nationwide →
The 8 gynecologic oncology physician records with the nearest ZIP codes
- Thanh Dellinger, M.D.Duarte, CA 910101073730891
- Stephen Lee, MDDuarte, CA 910101114185923
- Lorna Rodriguez, MD, PHDDuarte, CA 910101457436719
- Mihae Song, MDDuarte, CA 910101144665423
- Mark Wakabayashi, MDDuarte, CA 910101467547398
- Alan Schlaerth, M.D.Arcadia, CA 910071043239049
- Lynda Roman, M.D.Pasadena, CA 911051386649713
- Paul Lin, M.D.Pasadena, CA 911061083619100
Common questions
What is Ernest S. Han, MD's NPI number?
Ernest S. Han, MD's National Provider Identifier (NPI) is 1639247950, issued on Dec 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ernest S. Han, MD located?
The NPPES record lists a practice address at 1500 E Duarte Road, Duarte, CA, 91010. Phone: (626) 256-4673. Providers update this record themselves, so call before visiting.
How can I verify Ernest S. Han, MD's license?
NPPES lists California license number A85994, 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 Ernest S. Han, MD prescribe under Medicare Part D?
In 2024, Ernest S. Han, MD had 84 Medicare Part D claims for 47 beneficiaries; the average among gynecologic oncology physician prescribers was 195. Part D covers Medicare prescriptions only.
What is Ernest S. Han, MD's MIPS final score?
The 2023 MIPS final score is 99.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.