Cassandra Drew Proebstle, MD MA
NPI 1366146821 · Family Medicine Physician · Fontana, CA
Enrolled with Medicare as Order and Referring Only - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cassandra Drew Proebstle, MD MA is a Family Medicine Physician provider in Fontana, CA (NPI 1366146821).
Provider details
- NPI number
- 1366146821
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD MA
- Sex
- Female
- Sole proprietor
- No
- License
- A197858 (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
3 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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 30 | 14 |
| Atorvastatin Calcium | 29 | 17 |
| Amlodipine Besylate | 22 | — |
| Rosuvastatin Calcium | 14 | — |
| Levothyroxine Sodium | 14 | — |
| Losartan Potassium | 11 | — |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-03-29
- Last updated
- 2026-02-19
- Certified
- 2026-02-19
Frequently asked questions
- What is Cassandra Drew Proebstle's NPI number?
- Cassandra Drew Proebstle's National Provider Identifier (NPI) is 1366146821, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cassandra Drew Proebstle's specialty?
- Cassandra Drew Proebstle is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Cassandra Drew Proebstle located?
- Cassandra Drew Proebstle's practice location on file with NPPES is 17234 Valley Blvd, Fontana, CA 92335.
- What is Cassandra Drew Proebstle's phone number?
- The practice phone number listed in the NPPES registry for Cassandra Drew Proebstle is (111) 111-1111.
- Does Cassandra Drew Proebstle accept Medicare?
- Cassandra Drew Proebstle is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cassandra Drew Proebstle's NPI active?
- Yes — Cassandra Drew Proebstle's NPI (1366146821) is active in the NPPES registry as of the last update on 2026-02-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.