Guillermo Saenz Zavala, MD
NPI 1720475478 · Family Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guillermo Saenz Zavala, MD is a Family Medicine Physician provider in Fontana, CA (NPI 1720475478).
Provider details
- NPI number
- 1720475478
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
300 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 | 153 | $132 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 34 | $94 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 30 | $133 |
| Office Or Other Outpatient Visit for the Evaluation and Management of Established Patient That May Not Require Presence of Healthcare Professional99211 | 21 | $25 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 19 | $172 |
| Annual Wellness Visit; Includes a Personalized Prevention Plan of Service (pps), Initial Visit |
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 | 813 | 320 |
| Metformin Hcl | 371 | 142 |
| Losartan Potassium | 330 | 116 |
| Amlodipine Besylate | 309 | 120 |
| Lisinopril | 262 | 102 |
| Levothyroxine Sodium | 194 | 72 |
| Hydrochlorothiazide |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$100 across 6 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
- 2015-04-21
- Last updated
- 2018-08-02
Frequently asked questions
- What is Guillermo Saenz Zavala's NPI number?
- Guillermo Saenz Zavala's National Provider Identifier (NPI) is 1720475478, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Saenz Zavala's specialty?
- Guillermo Saenz Zavala is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Guillermo Saenz Zavala located?
- Guillermo Saenz Zavala's practice location on file with NPPES is 17234 Valley Blvd, Fontana, CA 92335.
- What is Guillermo Saenz Zavala's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Saenz Zavala is (909) 427-5084.
- Does Guillermo Saenz Zavala accept Medicare?
- Guillermo Saenz Zavala is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guillermo Saenz Zavala's NPI active?
- Yes — Guillermo Saenz Zavala's NPI (1720475478) is active in the NPPES registry as of the last update on 2018-08-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.