KAREN CHUNGUHN KIM MD
NPI 1639385479
Internal Medicine - Gastroenterology in Stanford, CA
About Karen Chunguhn Kim Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN CHUNGUHN KIM MD (NPI 1639385479) is an individual gastroenterology provider in Stanford, California, licensed in California (C182389) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in Ithaca, and is a graduate of Stanford University School Of Medicine (2005).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Karen Chunguhn Kim Md 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 Reassignments
4Medicare enrollment records show Karen Kim reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Redwood City, CA 94063
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Wellsboro, PA 16901
- Reassigned Medicare billing, Pennsylvania and New York enrollments
- Medicare enrollment name: Guthrie Medical Group PC
- Also billed through NPI 1134178635 (New York)
- 830 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 16
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 94305 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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 Karen Kim's NPI number?
The NPI number for Karen Kim is 1639385479. It was assigned to this individual provider in the NPPES registry on May 16, 2007.
Where is Karen Kim located?
Karen Kim practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Karen Kim's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Karen Kim enrolled in Medicare?
Yes. Karen Kim 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 organizations bill Medicare for Karen Kim's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Kim reassigns Medicare benefits to 4 organizations: Stanford Health Care (Stanford, CA), Lpch Medical Group Div Of Lucile (Palo Alto, CA), Permanente Medical Group Inc (Redwood City, CA) and Guthrie Medical Group, P.C. (Wellsboro, PA). Each 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 Karen Kim'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 Karen Kim was last updated on April 25, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Karen Chunguhn Kim, MD · NPI 1639385479
Gastroenterology physician in Stanford, California. Individual provider, active in the CMS NPPES registry since May 16, 2007.
## Identity
- **NPI:** 1639385479 (Entity type: Individual)
- **Enumerated:** May 16, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** C182389 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA); Permanente Medical Group Inc (NPI 1639252604, Redwood City, CA); Guthrie Medical Group, P.C. (NPI 1952350167, Wellsboro, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Stanford University School Of Medicine, class of 2005
## Record status
- **NPPES last updated:** April 25, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1639385479) · Data from the CMS NPPES public registry.