STEVEN NGUYEN M.D.
NPI 1013353663
Internal Medicine in Saint Louis, MO
About Steven Nguyen M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEVEN NGUYEN M.D. (NPI 1013353663) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2017028828) and active in the NPI registry since May 2013. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
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
Steven Nguyen 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 Reassignments
8Medicare enrollment records show Steven Nguyen reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: St Anthonys Physician Organization Hospitalist Services Lc
- 340 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 326 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 435 clinicians in this Medicare group
Bridgeton, MO 63044
- Reassigned Medicare billing, Missouri enrollment
- 301 clinicians in this Medicare group
Fenton, MO 63026
- Reassigned Medicare billing, Missouri enrollment
- 255 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 299 clinicians in this Medicare group
Winfield, MO 63389
- Reassigned Medicare billing, Missouri enrollment
- 229 clinicians in this Medicare group
Washington, MO 63090
- Reassigned Medicare billing, Missouri enrollment
- 261 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 2
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Hospital St Louis
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
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 Steven Nguyen's NPI number?
The NPI number for Steven Nguyen is 1013353663. It was assigned to this individual provider in the NPPES registry on May 21, 2013.
Where is Steven Nguyen located?
Steven Nguyen practices at 3635 Vista Ave, Saint Louis, MO 63110. The listed phone number is (314) 577-8000.
What is Steven Nguyen's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Steven Nguyen enrolled in Medicare?
Yes. Steven 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 Steven Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Nguyen reassigns Medicare benefits to 8 organizations: St Anthonys Physician Organization Hospitalist Services, L.C. (Saint Louis, MO), Mercy Clinic Adult Hospitalists - St. Louis, LLC (Saint Louis, MO), Mercy Hospitals East Communities (Saint Louis, MO), Sound Physicians Of Illinois, LLC (Bridgeton, MO), Cogent Healthcare Of Missouri, Inc (Fenton, MO) and 3 more organizations, listed in the Medicare section above. 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 Steven Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Steven Nguyen affiliated with any hospitals?
According to CMS data, Steven Nguyen is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for Steven Nguyen was last updated on March 7, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Steven Nguyen, M.D. · NPI 1013353663
Internal Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since May 21, 2013.
## Identity
- **NPI:** 1013353663 (Entity type: Individual)
- **Enumerated:** May 21, 2013
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2017028828 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 3635 VISTA AVE, Saint Louis, MO 63110-2539
- **Phone:** (314) 577-8000
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): St Anthonys Physician Organization Hospitalist Services, L.C. (NPI 1407216336, Saint Louis, MO); Mercy Clinic Adult Hospitalists - St. Louis, LLC (NPI 1841235108, Saint Louis, MO); Mercy Hospitals East Communities (NPI 1851431738, Saint Louis, MO); Sound Physicians Of Illinois, LLC (NPI 1043598865, Bridgeton, MO); Cogent Healthcare Of Missouri, Inc (NPI 1780961599, Fenton, MO); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** March 7, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1013353663) · Data from the CMS NPPES public registry.