Larry W. Kwak, M.D. , PHD
Hematology (Internal Medicine) Physician · Duarte, CA
Larry W. Kwak, M.D. , PHD is a hematology (internal medicine) physician with a practice address in Duarte, California, and NPI 1134215817, issued on Oct 4, 2006. Check the license (California G55439, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Larry W. Kwak
- Credential
- M.D. , PHD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- G55439 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 Duarte RD, Duarte, CA 91010
- Phone
- (626) 256-4673
- Enumerated
- Oct 4, 2006
- Record last updated
- Nov 11, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 165889001 TX
- Medicare enrollment
- Enrolled (PECOS I20150925001315); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1981
- Entity
- Type 1 · individual
8 nearest hematology (internal medicine) physician records → All 175 in California → Look up another NPI →
Also registered at 1500 Duarte RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Chelsea Abad, CRNP, AGPCNP - BCGerontology Nurse Practitioner1952848137
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- Farah Abdulla, MDDermatology Physician1093934390
- Megan Abel, PA-CPhysician Assistant1104100619
- Michelle Afkhami, M.D.Hematology (Pathology) Physician1326230228
- Vaibhav Agrawal, M.D.Hematology & Oncology Physician1538402565
Verify Larry W. Kwak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G55439Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
14 Medicare Part D claims, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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: $25.59
1 payment: food and beverage; the largest payer was PharmaEssentia USA Corporation. The 721 providers of this specialty with any payment received $13,778.35 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).
Larry W. Kwak among 175 hematology (internal medicine) physician records in California
Larry W. Kwak, M.D. , PHD is one of 175 hematology (internal medicine) physician records with a practice address in California. 89% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 65% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated1981 · median 2006 among the 135 with a school on file
- Record last updated2020 · 34% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
61 hematology (internal medicine) physician records list a practice address in Duarte
They are 61 of the 1,287 NPPES records with a practice address in Duarte, and 175 hematology (internal medicine) physician records in California.
All 175 in California → Every provider in Duarte → Hematology (Internal Medicine) Physician nationwide →
The 8 hematology (internal medicine) physician records with the nearest ZIP codes
- Joseph Alvarnas, M.D.Duarte, CA 910101558321745
- Andrew Artz, M.D., M.S.Duarte, CA 910101306859772
- Ravi Bhatia, MDDuarte, CA 910101326059700
- Lihua Budde, MD, PHDDuarte, CA 910101124030028
- Peter Curtin, M.D.Duarte, CA 910101316953862
- Alexey Danilov, M.D.Duarte, CA 910101487769733
- Amrita Krishnan, MDDuarte, CA 910101215948690
- Alexandra Levine, M.D.Duarte, CA 910101356371967
Common questions
What is Larry W. Kwak, M.D. , PHD's NPI number?
Larry W. Kwak, M.D. , PHD's National Provider Identifier (NPI) is 1134215817, issued on Oct 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Larry W. Kwak, M.D. , PHD located?
The NPPES record lists a practice address at 1500 Duarte RD, Duarte, CA, 91010. Phone: (626) 256-4673. Providers update this record themselves, so call before visiting.
How can I verify Larry W. Kwak, M.D. , PHD's license?
NPPES lists California license number G55439, 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 Larry W. Kwak, M.D. , PHD prescribe under Medicare Part D?
In 2024, Larry W. Kwak, M.D. , PHD had 14 Medicare Part D claims; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.
What is Larry W. Kwak, M.D. , PHD'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.