TAM N NGUYEN MD
NPI 1558520775
Otolaryngology in Owings Mills, MD
About Tam N Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TAM N NGUYEN MD (NPI 1558520775) is an individual otolaryngology provider in Owings Mills, Maryland, licensed in Maryland (D0076311) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS, is affiliated with Greater Baltimore Medical Center, and is a graduate of University Of Virginia School Of Medicine (2008).
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
Tam N Nguyen 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 Tam Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Owings Mills, MD 21117
- Reassigned Medicare billing, Maryland enrollment
- 31 clinicians in this Medicare group
Owings Mills, MD 21117
- Reassigned Medicare billing, Maryland enrollment
- 444 clinicians in this Medicare group
Annapolis, MD 21401
- Reassigned Medicare billing, Maryland enrollment
- 47 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 18
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.
Greater Baltimore Medical Center
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21117 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.
OWINGS MILLS, MD 21117
OWINGS MILLS, MD 21117
OWINGS MILLS, MD 21117
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 Tam Nguyen's NPI number?
The NPI number for Tam Nguyen is 1558520775. It was assigned to this individual provider in the NPPES registry on June 3, 2008.
Where is Tam Nguyen located?
Tam Nguyen practices at 23 Crossroads Dr Suite 400, Owings Mills, MD 21117. The listed phone number is (410) 356-2626.
What is Tam Nguyen's specialty?
The primary specialty registered for this NPI is Otolaryngology with taxonomy code 207Y00000X.
Is Tam Nguyen enrolled in Medicare?
Yes. Tam 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 Tam Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Tam Nguyen reassigns Medicare benefits to 3 organizations: University Of Maryland Specialty Care Network LLC (Owings Mills, MD), Greater Baltimore Medical Center, Inc. (Owings Mills, MD) and Annapolis Ent Surgical Center LLC (Annapolis, MD). 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 Tam Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Tam Nguyen affiliated with any hospitals?
According to CMS data, Tam Nguyen is affiliated with Greater Baltimore Medical Center.
When was this NPI record last updated?
The NPPES record for Tam Nguyen was last updated on August 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Tam N Nguyen, MD · NPI 1558520775
Otolaryngology physician in Owings Mills, Maryland. Individual provider, active in the CMS NPPES registry since June 3, 2008.
## Identity
- **NPI:** 1558520775 (Entity type: Individual)
- **Enumerated:** June 3, 2008
- **Primary specialty:** Otolaryngology · taxonomy 207Y00000X
- **State license:** D0076311 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 23 CROSSROADS DR, SUITE 400, Owings Mills, MD 21117-5420
- **Phone:** (410) 356-2626 · **Fax:** (410) 356-8945
## 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): University Of Maryland Specialty Care Network LLC (NPI 1235067299, Owings Mills, MD); Greater Baltimore Medical Center, Inc. (NPI 1447072517, Owings Mills, MD); Annapolis Ent Surgical Center LLC (NPI 1275372617, Annapolis, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Virginia School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** August 3, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1558520775) · Data from the CMS NPPES public registry.