DR. WENJI GUO MD
NPI 1538604392
Internal Medicine - Medical Oncology in San Diego, CA
About Dr. Wenji Guo Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WENJI GUO MD (NPI 1538604392) is an individual medical oncology provider in San Diego, California, licensed in California (209443) and active in the NPI registry since January 2017. She is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and maintains 5 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 4
Secondary Practice Locations 5
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. Wenji Guo 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
3Medicare enrollment records show Wenji Guo reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Diego, CA 92103
- Reassigned Medicare billing, California enrollment
- 1,051 clinicians in this Medicare group
Chicago, IL 60637
- Reassigned Medicare billing, Illinois enrollment
- 1,905 clinicians in this Medicare group
Chicago, IL 60637
- Reassigned Medicare billing, Illinois enrollment
- 2,237 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
The University Of Chicago Medical Center
Acute Care Hospitals · Chicago, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92103 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 2
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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN DIEGO, CA 92103
SAN DIEGO, CA 92103
SAN DIEGO, CA 92103
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 Wenji Guo's NPI number?
The NPI number for Wenji Guo is 1538604392. It was assigned to this individual provider in the NPPES registry on January 3, 2017.
Where is Wenji Guo located?
Wenji Guo practices at 200 W Arbor Dr, San Diego, CA 92103. The listed phone number is (800) 926-8273.
What is Wenji Guo's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is Wenji Guo enrolled in Medicare?
Yes. Wenji Guo 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 Wenji Guo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Wenji Guo reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (San Diego, CA), The University Of Chicago Medical Center (Chicago, IL) and University Of Chicago (Chicago, IL). 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 Wenji Guo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Wenji Guo affiliated with any hospitals?
According to CMS data, Wenji Guo is affiliated with The University Of Chicago Medical Center.
When was this NPI record last updated?
The NPPES record for Wenji Guo was last updated on June 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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. Wenji Guo, MD · NPI 1538604392
Medical Oncology physician in San Diego, California. Individual provider, active in the CMS NPPES registry since January 3, 2017.
## Identity
- **NPI:** 1538604392 (Entity type: Individual)
- **Enumerated:** January 3, 2017
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** 209443 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 W ARBOR DR, San Diego, CA 92103-9000
- **Phone:** (800) 926-8273 · **Fax:** (888) 539-8781
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1487772380, San Diego, CA); The University Of Chicago Medical Center (NPI 1033218128, Chicago, IL); University Of Chicago (NPI 1821048786, Chicago, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Johns Hopkins University School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** June 15, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1538604392) · Data from the CMS NPPES public registry.