Paul Chen, M.D.
NPI 1588689350 · Internal Medicine Physician · Rialto, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Paul Chen, M.D. is a Internal Medicine Physician provider in Rialto, CA (NPI 1588689350).
Provider details
- NPI number
- 1588689350
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A86154 (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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
349 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 | 208 | $131 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 57 | $93 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 32 | $55 |
| Administration of Influenza Virus VaccineG0008 | 27 | $33 |
| Administration and Interpretation of Patient-Focused Health Risk Assessment96160 | 25 | $3 |
Typical Medicare-allowed amounts for these services range $3–$131 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 147 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 1,130 | 358 |
| Metformin Hcl | 803 | 227 |
| Lisinopril | 737 | 229 |
| Amlodipine Besylate | 705 | 218 |
| Omeprazole | 457 | 146 |
| Hydrochlorothiazide | 439 | 130 |
| Losartan Potassium | 400 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$165 across 2 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
Additional practice locations (1)
- 8110 Mango AveFontana, CA 92335-3603Phone: (909) 822-1164Fax: (909) 357-2235
Registry dates
- Enumerated
- 2006-07-13
- Last updated
- 2025-12-07
- Certified
- 2025-12-07
Frequently asked questions
- What is Paul Chen's NPI number?
- Paul Chen's National Provider Identifier (NPI) is 1588689350, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Paul Chen's specialty?
- Paul Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Paul Chen located?
- Paul Chen's practice location on file with NPPES is 1851 N Riverside Ave, Rialto, CA 92376-8069.
- What is Paul Chen's phone number?
- The practice phone number listed in the NPPES registry for Paul Chen is (909) 421-2700.
- Does Paul Chen accept Medicare?
- Paul Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Paul Chen's NPI active?
- Yes — Paul Chen's NPI (1588689350) is active in the NPPES registry as of the last update on 2025-12-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.