Chimezie Ubbaonu, MD
NPI 1790004943 · Hematology & Oncology Physician · Vacaville, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chimezie Ubbaonu, MD is a Hematology & Oncology Physician provider in Vacaville, CA (NPI 1790004943).
Provider details
- NPI number
- 1790004943
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A132171 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 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 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prochlorperazine Maleate | 93 | 56 |
| Abiraterone Acetate | 69 | 18 |
| Dexamethasone | 57 | 28 |
| Prednisone | 56 | 26 |
| Prochlorperazinebrand: Compro | 50 | 45 |
| Ondansetron Hcl | 46 | 28 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 36 | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-05-27
- Last updated
- 2024-03-22
- Certified
- 2024-03-22
Frequently asked questions
- What is Chimezie Ubbaonu's NPI number?
- Chimezie Ubbaonu's National Provider Identifier (NPI) is 1790004943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chimezie Ubbaonu's specialty?
- Chimezie Ubbaonu is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Chimezie Ubbaonu located?
- Chimezie Ubbaonu's practice location on file with NPPES is 1 Quality Dr, Vacaville, CA 95688-9494.
- What is Chimezie Ubbaonu's phone number?
- The practice phone number listed in the NPPES registry for Chimezie Ubbaonu is (707) 624-4000.
- Does Chimezie Ubbaonu accept Medicare?
- Chimezie Ubbaonu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chimezie Ubbaonu's NPI active?
- Yes — Chimezie Ubbaonu's NPI (1790004943) is active in the NPPES registry as of the last update on 2024-03-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.