CHRISTOPHER MICHAEL NGUYEN DO
NPI 1649833237
Internal Medicine - Gastroenterology in Chesterfield, MO
About Christopher Michael Nguyen Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHRISTOPHER MICHAEL NGUYEN DO (NPI 1649833237) is an individual gastroenterology provider in Chesterfield, Missouri, licensed in Missouri (2023019628) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Ssm Health Saint Louis University Hospital, and is a graduate of University Of North Texas Hsc, College Of Osteopathic Med (2019).
NPPES Registry Identity
Specialties & Licenses
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
Christopher Michael Nguyen Do 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
2Medicare enrollment records show Christopher Nguyen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chesterfield, MO 63005
- Reassigned Medicare billing, Missouri enrollment
- 26 clinicians in this Medicare group
Saint Louis, MO 63104
- Reassigned Medicare billing, Missouri enrollment
- 1,294 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ssm Health Saint Louis University Hospital
Acute Care Hospitals · Saint Louis, MOSt Lukes Hospital
Acute Care Hospitals · Chesterfield, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63005 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 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHESTERFIELD, MO 63005
CHESTERFIELD, MO 63005
CHESTERFIELD, MO 63005
CHESTERFIELD, MO 63005
CHESTERFIELD, MO 63005
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 Christopher Nguyen's NPI number?
The NPI number for Christopher Nguyen is 1649833237. It was assigned to this individual provider in the NPPES registry on April 18, 2019.
Where is Christopher Nguyen located?
Christopher Nguyen practices at 17298 N Outer 40 Rd Ste 200, Chesterfield, MO 63005. The listed phone number is (314) 529-4900.
What is Christopher Nguyen's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Christopher Nguyen enrolled in Medicare?
Yes. Christopher Nguyen 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 Christopher Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Christopher Nguyen reassigns Medicare benefits to 2 organizations: Gateway Gastroenterology Inc (Chesterfield, MO) and Ssm Health Care Group (Saint Louis, MO). 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 Christopher Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Christopher Nguyen accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list Christopher Nguyen 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 Christopher Nguyen affiliated with any hospitals?
According to CMS data, Christopher Nguyen is affiliated with Ssm Health Saint Louis University Hospital and St Lukes Hospital.
When was this NPI record last updated?
The NPPES record for Christopher Nguyen was last updated on October 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 days 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.
# Christopher Michael Nguyen, DO · NPI 1649833237
Gastroenterology physician in Chesterfield, Missouri. Individual provider, active in the CMS NPPES registry since April 18, 2019.
## Identity
- **NPI:** 1649833237 (Entity type: Individual)
- **Enumerated:** April 18, 2019
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 2023019628 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 17298 N OUTER 40 RD STE 200, Chesterfield, MO 63005-1456
- **Phone:** (314) 529-4900
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Gateway Gastroenterology Inc (NPI 1043250400, Chesterfield, MO); Ssm Health Care Group (NPI 1306589544, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of North Texas Hsc, College Of Osteopathic Med, class of 2019
## Record status
- **NPPES last updated:** October 21, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1649833237) · Data from the CMS NPPES public registry.