DR. GEMMA TOK HYON KO M.D.
NPI 1437167715
Internal Medicine in Pico Rivera, CA
About Dr. Gemma Tok Hyon Ko M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GEMMA TOK HYON KO M.D. (NPI 1437167715) is an individual internal medicine provider in Pico Rivera, California, licensed in California (G70866) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through January 14, 2028, and is a graduate of University Of Hawaii John A. Burns School Of Medicine (1990).
NPPES Registry Identity
Specialties & Licenses
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 and accepts Medicare assignment
Dr. Gemma Tok Hyon Ko M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Gemma Ko reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Pico Rivera, CA 90660
- Reassigned Medicare billing, California enrollment
- 2 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.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 05D0864286
Gemma T H Ko, MD Inc · Pico Rivera, CAAreas of Expertise CMS Part B claims 9
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 90660 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.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PICO RIVERA, CA 90660
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 Gemma Ko's NPI number?
The NPI number for Gemma Ko is 1437167715. It was assigned to this individual provider in the NPPES registry on August 3, 2006.
Where is Gemma Ko located?
Gemma Ko practices at 4511 Rosemead Blvd, Pico Rivera, CA 90660. The listed phone number is (562) 692-3388.
What is Gemma Ko's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Gemma Ko enrolled in Medicare?
Yes. Gemma Ko is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Gemma Ko's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gemma Ko reassigns Medicare benefits to Gemma Th Ko,md. Inc. (Pico Rivera, 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 Gemma Ko's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Does Gemma Ko hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 05D0864286) is associated with this NPI, valid through January 14, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Gemma Ko was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Dr. Gemma Tok Hyon Ko, M.D. · NPI 1437167715
Internal Medicine physician in Pico Rivera, California. Individual provider, active in the CMS NPPES registry since August 3, 2006.
## Identity
- **NPI:** 1437167715 (Entity type: Individual)
- **Enumerated:** August 3, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** G70866 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 4511 ROSEMEAD BLVD, Pico Rivera, CA 90660-2032
- **Phone:** (562) 692-3388
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Gemma Th Ko,md. Inc. (NPI 1184633620, Pico Rivera, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Hawaii John A. Burns School Of Medicine, class of 1990
## Record status
- **NPPES last updated:** July 8, 2007
- **Other identifiers:** Medicare ID-Type Unspecified G70866 (CA); Medicare UPIN E58526 (CA); Medicaid 00G708660 (CA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1437167715) · Data from the CMS NPPES public registry.