Sze Hoay Ding, M.D.
NPI 1023239035 · Internal Medicine Physician · San Marcos, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sze Hoay Ding, M.D. is a Internal Medicine Physician provider in San Marcos, CA (NPI 1023239035).
Provider details
- NPI number
- 1023239035
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- C141004 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 104 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 380 | 132 |
| Levothyroxine Sodium | 357 | 107 |
| Amlodipine Besylate | 328 | 124 |
| Rosuvastatin Calcium | 320 | 109 |
| Losartan Potassium | 256 | 97 |
| Lisinopril | 240 | 79 |
| Omeprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$113 across 1 record (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
- 2007-05-01
- Last updated
- 2023-03-07
- Certified
- 2021-11-08
Frequently asked questions
- What is Sze Hoay Ding's NPI number?
- Sze Hoay Ding's National Provider Identifier (NPI) is 1023239035, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sze Hoay Ding's specialty?
- Sze Hoay Ding is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sze Hoay Ding located?
- Sze Hoay Ding's practice location on file with NPPES is 400 Craven Rd, San Marcos, CA 92078-4201.
- What is Sze Hoay Ding's phone number?
- The practice phone number listed in the NPPES registry for Sze Hoay Ding is (619) 318-7476.
- Does Sze Hoay Ding accept Medicare?
- Sze Hoay Ding is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sze Hoay Ding's NPI active?
- Yes — Sze Hoay Ding's NPI (1023239035) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.