Calvin Duong, M.D.
NPI 1184646119 · Internal Medicine Physician · Colton, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Calvin Duong, M.D. is a Internal Medicine Physician provider in Colton, CA (NPI 1184646119).
Provider details
- NPI number
- 1184646119
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A91752 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 73 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 377 | 177 |
| Lisinopril | 208 | 85 |
| Losartan Potassium | 174 | 81 |
| Amlodipine Besylate | 169 | 82 |
| Metformin Hcl | 149 | 67 |
| Levothyroxine Sodium | 137 | 57 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-25
- Last updated
- 2021-12-02
Frequently asked questions
- What is Calvin Duong's NPI number?
- Calvin Duong's National Provider Identifier (NPI) is 1184646119, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Calvin Duong's specialty?
- Calvin Duong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Calvin Duong located?
- Calvin Duong's practice location on file with NPPES is 1300 E Cooley Dr, Colton, CA 92324-3905.
- What is Calvin Duong's phone number?
- The practice phone number listed in the NPPES registry for Calvin Duong is (909) 370-4100.
- Does Calvin Duong accept Medicare?
- Calvin Duong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Calvin Duong's NPI active?
- Yes — Calvin Duong's NPI (1184646119) is active in the NPPES registry as of the last update on 2021-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.