Christopher Nguyen, MD
NPI 1588624100 · Geriatric Medicine (Internal Medicine) Physician · Mission Viejo, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Nguyen, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Mission Viejo, CA (NPI 1588624100).
Provider details
- NPI number
- 1588624100
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A74293 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,435 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 714 | $139 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 384 | $98 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 122 | $61 |
| Administration of Pneumococcal VaccineG0009 | 70 | $35 |
| Administration of Influenza Virus VaccineG0008 | 62 | $35 |
| Urinalysis, Manual Test81002 | 29 | $3 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 148 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 790 | 232 |
| Rosuvastatin Calcium | 693 | 217 |
| Levothyroxine Sodium | 632 | 166 |
| Amlodipine Besylate | 591 | 177 |
| Losartan Potassium | 318 | 98 |
| Lisinopril | 310 | 91 |
| Alendronate Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,145 across 47 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-27
- Last updated
- 2026-01-16
- Certified
- 2026-01-16
Frequently asked questions
- What is Christopher Nguyen's NPI number?
- Christopher Nguyen's National Provider Identifier (NPI) is 1588624100, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Nguyen's specialty?
- Christopher Nguyen is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Nguyen located?
- Christopher Nguyen's practice location on file with NPPES is 23512 Madero, Mission Viejo, CA 92691-2743.
- What is Christopher Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Christopher Nguyen is (949) 583-1600.
- Does Christopher Nguyen accept Medicare?
- Christopher Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Nguyen's NPI active?
- Yes — Christopher Nguyen's NPI (1588624100) is active in the NPPES registry as of the last update on 2026-01-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.