Calvin Deng, MD
NPI 1326126491 · Internal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Calvin Deng, MD is a Internal Medicine Physician provider in Walnut Creek, CA (NPI 1326126491).
Provider details
- NPI number
- 1326126491
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A83695 (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 · 70 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 409 | 140 |
| Atorvastatin Calcium | 265 | 97 |
| Losartan Potassium | 178 | 60 |
| Fluticasone Propionate | 140 | 57 |
| Hydrochlorothiazide | 136 | 43 |
| Gabapentin | 122 | 43 |
| Lisinopril | 115 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2021-12-13
Frequently asked questions
- What is Calvin Deng's NPI number?
- Calvin Deng's National Provider Identifier (NPI) is 1326126491, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Calvin Deng's specialty?
- Calvin Deng is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Calvin Deng located?
- Calvin Deng's practice location on file with NPPES is 320 Lennon Ln, Walnut Creek, CA 94598-2419.
- What is Calvin Deng's phone number?
- The practice phone number listed in the NPPES registry for Calvin Deng is (925) 906-2000.
- Does Calvin Deng accept Medicare?
- Calvin Deng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Calvin Deng's NPI active?
- Yes — Calvin Deng's NPI (1326126491) is active in the NPPES registry as of the last update on 2021-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.