DR. ZENAN LI CHANG MD
NPI 1790346724
Internal Medicine - Gastroenterology in Saint Louis, MO
About Dr. Zenan Li Chang Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ZENAN LI CHANG MD (NPI 1790346724) is an individual gastroenterology provider in Saint Louis, Missouri, licensed in Missouri (2024011460) and active in the NPI registry since June 2019. He is enrolled in Medicare PECOS, is affiliated with Barnes Jewish Hospital, and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Accepted Insurance
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. Zenan Li Chang 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 Reassignment
Medicare enrollment records show Zenan Chang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 1,133 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.
Barnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
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 Zenan Chang's NPI number?
The NPI number for Zenan Chang is 1790346724. It was assigned to this individual provider in the NPPES registry on June 20, 2019.
Where is Zenan Chang located?
Zenan Chang practices at 1 Barnes Jewish Hospital Plz Div Im Gastroenterology, Saint Louis, MO 63110. The listed phone number is (314) 747-2066.
What is Zenan Chang's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Zenan Chang enrolled in Medicare?
Yes. Zenan Chang 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 Zenan Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Zenan Chang reassigns Medicare benefits to Washington University (Saint Louis, MO). 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 Zenan Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Zenan Chang accept?
Health plans from Cox HealthPlans list Zenan Chang as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Zenan Chang affiliated with any hospitals?
According to CMS data, Zenan Chang is affiliated with Barnes Jewish Hospital.
When was this NPI record last updated?
The NPPES record for Zenan Chang was last updated on April 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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. Zenan Li Chang, MD · NPI 1790346724
Gastroenterology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 20, 2019.
## Identity
- **NPI:** 1790346724 (Entity type: Individual)
- **Enumerated:** June 20, 2019
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 2024011460 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 BARNES JEWISH HOSPITAL PLZ, DIV IM GASTROENTEROLOGY, Saint Louis, MO 63110-1003
- **Phone:** (314) 747-2066 · **Fax:** (314) 362-2357
## 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:** Washington University (NPI 1992746903, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** April 15, 2025
- **Other identifiers:** Medicaid 200073260 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1790346724) · Data from the CMS NPPES public registry.