Lilybeth Sistoza, MD
NPI 1538172358 · Internal Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lilybeth Sistoza, MD is a Internal Medicine Physician provider in Fontana, CA (NPI 1538172358).
Provider details
- NPI number
- 1538172358
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A78188 (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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 32 | 14 |
| Amlodipine Besylate | 23 | 12 |
| Gabapentin | 19 | — |
| Losartan Potassium | 19 | 11 |
| Metformin Hcl | 13 | — |
| Omeprazole | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$30 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
- 2006-08-14
- Last updated
- 2017-02-12
Frequently asked questions
- What is Lilybeth Sistoza's NPI number?
- Lilybeth Sistoza's National Provider Identifier (NPI) is 1538172358, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lilybeth Sistoza's specialty?
- Lilybeth Sistoza is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lilybeth Sistoza located?
- Lilybeth Sistoza's practice location on file with NPPES is 17264 Foothill Blvd, Fontana, CA 92335-9051.
- What is Lilybeth Sistoza's phone number?
- The practice phone number listed in the NPPES registry for Lilybeth Sistoza is (909) 428-3900.
- Does Lilybeth Sistoza accept Medicare?
- Lilybeth Sistoza is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lilybeth Sistoza's NPI active?
- Yes — Lilybeth Sistoza's NPI (1538172358) is active in the NPPES registry as of the last update on 2017-02-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.