Quoc Nguyen, M.D.
NPI 1659394419 · Otolaryngic Allergy Physician · Garden Grove, CA
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Quoc Nguyen, M.D. is a Otolaryngic Allergy Physician provider in Garden Grove, CA (NPI 1659394419).
Provider details
- NPI number
- 1659394419
- Entity type
- Individual
- Primary specialty
- Otolaryngic Allergy PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G75928 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,470 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,497 | $98 |
| Removal of Impacted Ear Wax69210 | 1,359 | $52 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 357 | $138 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 99 | $120 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 88 | $179 |
| Diagnostic Exam of Voice Box Using a Flexible Endoscope31575 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propionate | 673 | 173 |
| Fluocinolone Acetonide Oil | 251 | 113 |
| Azelastine Hcl | 231 | 56 |
| Ofloxacin | 101 | 55 |
| Omeprazole | 84 | 28 |
| Pilocarpine Hcl | 73 | 16 |
| Ciprofloxacin Hcl | 69 | 48 |
| Ipratropium Bromide | 64 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-25
- Last updated
- 2022-07-29
- Certified
- 2022-07-29
Frequently asked questions
- What is Quoc Nguyen's NPI number?
- Quoc Nguyen's National Provider Identifier (NPI) is 1659394419, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Quoc Nguyen's specialty?
- Quoc Nguyen is listed in the NPPES registry with a primary specialty of Otolaryngic Allergy Physician (Allopathic & Osteopathic Physicians).
- Where is Quoc Nguyen located?
- Quoc Nguyen's practice location on file with NPPES is 13362 Brookhurst St, Garden Grove, CA 92843-3153.
- What is Quoc Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Quoc Nguyen is (714) 534-4471.
- Does Quoc Nguyen accept Medicare?
- Quoc Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Quoc Nguyen's NPI active?
- Yes — Quoc Nguyen's NPI (1659394419) is active in the NPPES registry as of the last update on 2022-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.