Physician Profile
Roger L. Nguyen, M.D
Unclaimed ProfileAbout Dr. Nguyen
Roger L. Nguyen, M.D is a healthcare provider in Garden Grove, CA specializing in allergy. Roger trained at Albert Einstein College of Medicine of Yeshiva University, graduating in 1997. According to Medicare claims data, Roger cared for 88 Medicare patients across 1,950 services. The services billed most often include test for allergy using allergenic extract, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (714) 638-4433
- Email not available
Practice Locations
9746 WESTMINSTER AVE STE A
Garden Grove, CA 92844
Procedures Most Often Billed to Medicare
1,950 services · 88 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Test for allergy using allergenic extract | Treatment | 95004 |
1,866 | As often as other peers in Allergy |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
38 | As often as other peers in Allergy |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
19 | Less often than most peers in Allergy |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
15 | Less often than most peers in Allergy |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
12 | Less often than most peers in Allergy |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Albert Einstein College of Medicine of Yeshiva University 6
Other providers in the same specialty who trained at the same institution.
Class of 1997 at Albert Einstein College of Medicine of Yeshiva University 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Test for allergy using allergenic extract 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Roger L. Nguyen specialize in?
Roger L. Nguyen is an allergy in Garden Grove, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Roger L. Nguyen located?
Roger L. Nguyen is listed at 9746 Westminster Ave Ste A, Garden Grove, CA 92844. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Roger L. Nguyen's phone number?
The number on file is (714) 638-4433. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Roger L. Nguyen's NPI number?
Roger L. Nguyen's National Provider Identifier is 1982625430. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Roger L. Nguyen train?
Roger L. Nguyen attended Albert Einstein College of Medicine of Yeshiva University, graduating in 1997. This comes from the CMS National Downloadable File.
CMS public data
How long has Roger L. Nguyen been practicing?
Roger L. Nguyen has 29 years experience. Calculated from a graduation year of 1997, reported in the CMS National Downloadable File.
CMS public data
What does Roger L. Nguyen do most often?
According to Medicare billing data, Roger L. Nguyen provides treatments such as test for allergy using allergenic extract, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Roger L. Nguyen confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Roger L. Nguyen. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.