LARRY W. KWAK M.D. , PHD
NPI 1134215817
Internal Medicine - Hematology in Duarte, CA
About Larry W. Kwak M.d. , Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LARRY W. KWAK M.D. , PHD (NPI 1134215817) is an individual hematology provider in Duarte, California, licensed in California (G55439) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Houston.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Larry W. Kwak M.d. , Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Larry Kwak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Duarte, CA 91010
- Reassigned Medicare billing, California enrollment
- 1,335 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91010 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
DUARTE, CA 91010
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Larry Kwak's NPI number?
The NPI number for Larry Kwak is 1134215817. It was assigned to this individual provider in the NPPES registry on October 4, 2006.
Where is Larry Kwak located?
Larry Kwak practices at 1500 Duarte Rd, Duarte, CA 91010. The listed phone number is (626) 256-4673.
What is Larry Kwak's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology, with taxonomy code 207RH0000X.
Is Larry Kwak enrolled in Medicare?
Yes. Larry Kwak is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Larry Kwak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Larry Kwak reassigns Medicare benefits to City Of Hope Medical Foundation (Duarte, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Larry Kwak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Larry Kwak was last updated on November 11, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Larry W. Kwak, M.D. , PHD · NPI 1134215817
Hematology physician in Duarte, California. Individual provider, active in the CMS NPPES registry since October 4, 2006.
## Identity
- **NPI:** 1134215817 (Entity type: Individual)
- **Enumerated:** October 4, 2006
- **Primary specialty:** Internal Medicine - Hematology · taxonomy 207RH0000X
- **State license:** G55439 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 DUARTE RD, Duarte, CA 91010-3012
- **Phone:** (626) 256-4673
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** City Of Hope Medical Foundation (NPI 1871886366, Duarte, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 11, 2020
- **Other identifiers:** Other P00170261 (TX); Other 8M5590 (TX); Medicaid 165889001 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1134215817) · Data from the CMS NPPES public registry.