Man Duong, M.D.
NPI 1679718399 · Internal Medicine Physician · Calexico, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Man Duong, M.D. is a Internal Medicine Physician provider in Calexico, CA (NPI 1679718399).
Provider details
- NPI number
- 1679718399
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A105702 (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
17 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
6,831 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 | 3,244 | $124 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 463 | $14 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, First 20 Minutes99457 | 364 | $45 |
| Removal of Fingernails Or Toenails, 6 Or More Nails11721 | 347 | $44 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, Each Additional 20 Minutes99458 | 300 | $38 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 137 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 672 | 185 |
| Metformin Hcl | 537 | 142 |
| Lisinopril | 338 | 89 |
| Losartan Potassium | 288 | 68 |
| Levothyroxine Sodium | 263 | 68 |
| Amlodipine Besylate | 234 | 59 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$365 across 18 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
- 2008-12-09
- Last updated
- 2024-03-20
- Certified
- 2024-03-20
Frequently asked questions
- What is Man Duong's NPI number?
- Man Duong's National Provider Identifier (NPI) is 1679718399, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Man Duong's specialty?
- Man Duong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Man Duong located?
- Man Duong's practice location on file with NPPES is 423 E 2nd St, Calexico, CA 92231-2846.
- What is Man Duong's phone number?
- The practice phone number listed in the NPPES registry for Man Duong is (760) 890-5432.
- Does Man Duong accept Medicare?
- Man Duong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Man Duong's NPI active?
- Yes — Man Duong's NPI (1679718399) is active in the NPPES registry as of the last update on 2024-03-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.