Dr. Chimezie D. Ubbaonu, MD
- Medicare services, 2020
- 606
- Part D claims, 2024
- 709
- Publications
- 2
- Hospital affiliations
- 2
- Industry payments
- $31
- Practice address
- 975 Sereno Dr, Vallejo, CA 94589
- Practice phone
- Call (707) 651-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ubbaonu's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Chimezie D. Ubbaonu is a hematologist and oncologist in Vallejo, California
Dr. Ubbaonu practices at Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente.
Dr. Ubbaonu's NPI, 1790004943, was assigned on May 27, 2010. Dr. Ubbaonu graduated from University of Lagos College of Medicine in 2003. Dr. Ubbaonu holds California license A132171.
- NPI
- 1790004943NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2264675297
- NPI enumeration date
- May 27, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (707) 651-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Chimezie D. Ubbaonu practices at Vallejo Medical Center in Vallejo, California
Dr. Ubbaonu's primary practice is Vallejo Medical Center, at 975 Sereno Dr, Vallejo, CA 94589 in Solano County. The practice phone is (707) 651-1000.
- Vallejo Medical Center975 Sereno Dr, Vallejo, CA 94589 · Solano CountyPhone(707) 651-1000
Source: Dmand AI Affiliation Data
Dr. Chimezie D. Ubbaonu is affiliated with 4 sites of care and 1 medical group
Dr. Ubbaonu's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. Dr. Ubbaonu is also affiliated with Vacaville Medical Center. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Ubbaonu to 1 more home health agency and 1 hospice, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Chimezie D. Ubbaonu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ubbaonu practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Vallejo Medical Center | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Chimezie D. Ubbaonu is one of 1,502 hematologists and oncologists in California
Hematology and oncology is Dr. Ubbaonu's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dmand AI has Dr. Ubbaonu's licenses on file in 2 states: California and New Mexico.
Specialties and state licenses
- Hematology and oncology, CaliforniaPrimary
- New Mexico license
Hematologists and oncologists near Dr. Ubbaonu
Counts of hematologists and oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Chimezie D. Ubbaonu billed Medicare for 606 services in 2020
CMS data shows 606 Medicare services from Dr. Ubbaonu across 4 procedure codes in 2020. Medicare paid $42,559 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Ubbaonu's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 7622020: 60620%
Dr. Ubbaonu compared with the California median for hematologists and oncologists, 2020
- Dr. Ubbaonu
- California median
- Medicare services
- 606vs 93235% below
- Part D claims
- 577vs 39446% above
Medians across 1,367 hematologists and oncologists in California with Dmand AI profiles that report each measure.
Dr. Ubbaonu's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ubbaonu and other hematologists and oncologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Chimezie D. Ubbaonu's patients have a median age of 67
Across all payers, Dmand AI patient panel data puts Dr. Ubbaonu's median patient age at 67, with 39% women.
Dr. Ubbaonu's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women39%
- Men61%
Source: Dmand AI Patient Panel Data
Dr. Chimezie D. Ubbaonu wrote 709 Medicare Part D claims in 2024
In 2024, Dr. Ubbaonu wrote 709 Medicare Part D claims for 149 patients. 92% of them were for generic drugs. CMS names the drug for 577 of them, across 17 drugs with 11 or more claims each, at $499,688 in total drug cost.
Dr. Ubbaonu's Part D claims by kind of drug, 2024
- Generic654 claims92%
- Brand-name55 claims8%
Dr. Ubbaonu's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Ubbaonu's Part D claims, 2024
- Opioids9%62 of 709 claims
- Antibiotics2%14 of 709 claims
- Antipsychotics, patients 65 and over4%28 of 709 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Chimezie D. Ubbaonu offers telehealth to Medicare patients
Dr. Ubbaonu accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ubbaonu as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Chimezie D. Ubbaonu has 2 publications on record
Dmand AI links 2 papers to Dr. Ubbaonu in 2023. Dr. Ubbaonu's most frequent co-authors are Kari Joanne Kansal, MD and Jason Adam Zell, DO.
Dr. Ubbaonu's most frequent co-authors
Recent publications by Dr. Ubbaonu
See who Dr. Ubbaonu researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ubbaonu works with, so you can find a warm path to the right hematologists and oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Chimezie D. Ubbaonu received $31 in industry payments in 2017
CMS Open Payments shows 2 general payments to Dr. Ubbaonu from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. BTG International, Inc. paid the most, $31.
Companies that paid Dr. Ubbaonu the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Chimezie D. Ubbaonu graduated from University of Lagos College of Medicine
Dr. Ubbaonu graduated from University of Lagos College of Medicine in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Chimezie D. Ubbaonu accepts plans from 10 insurance carriers
Dr. Ubbaonu is in network with 10 carriers, including United Healthcare, Kaiser Permanente and Aetna. HMO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- United Healthcare
- Kaiser Permanente
- Aetna
- Elevance
- HCSC
- Alliant Health Plans
- Blue Cross Blue Shield of Michigan
- CMS Medicare
- +2 more carriersWith a free account
Plan types Dr. Ubbaonu accepts, by number of carriers
- HMO7
- PPO4
- EPO3
- Medicare2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Chimezie D. Ubbaonu's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Chimezie D. Ubbaonu
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Chimezie D. Ubbaonu's NPI number?
Dr. Chimezie D. Ubbaonu's NPI number is 1790004943. It was assigned on May 27, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Chimezie D. Ubbaonu?
Dr. Chimezie D. Ubbaonu is a hematologist and oncologist in Vallejo, California. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Chimezie D. Ubbaonu practice?
Dr. Ubbaonu practices at 975 Sereno Dr, Vallejo, CA 94589. Dr. Ubbaonu's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. Dmand AI also links Dr. Ubbaonu to 1 home health agency and 1 hospice.
What is Dr. Chimezie D. Ubbaonu's office phone number?
The practice phone on file for Dr. Ubbaonu is (707) 651-1000.
What is Dr. Chimezie D. Ubbaonu's medical license number?
Dr. Ubbaonu holds California license A132171, one of the licenses on file in 2 states.
Which states has Dr. Chimezie D. Ubbaonu been licensed in?
Dmand AI has state licenses on file for Dr. Ubbaonu in California (2014 to 2027) and New Mexico (2013 to 2015).
Which hospitals is Dr. Chimezie D. Ubbaonu affiliated with?
Dr. Ubbaonu practices at Vallejo Medical Center in Vallejo, California. Dr. Ubbaonu is also affiliated with Vacaville Medical Center.
What medical group is Dr. Chimezie D. Ubbaonu part of?
Dr. Ubbaonu is linked to The Permanente Medical Group, Inc.
Does Dr. Chimezie D. Ubbaonu accept Medicare?
Yes. CMS data shows Dr. Ubbaonu billed Medicare for 606 services in 2020, and Dr. Ubbaonu accepts Medicare assignment.
Does Dr. Chimezie D. Ubbaonu offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ubbaonu as offering telehealth services.
Show 8 more questionsShow fewer questions
What services does Dr. Chimezie D. Ubbaonu bill to Medicare?
In 2020, Dr. Ubbaonu's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99238) and hospital inpatient care (99233).
Where did Dr. Chimezie D. Ubbaonu go to medical school?
Dr. Ubbaonu graduated from University of Lagos College of Medicine in 2003.
What drugs does Dr. Chimezie D. Ubbaonu prescribe most?
In 2024 Medicare Part D data, Dr. Ubbaonu's most prescribed drugs by claims were Prochlorperazine Maleate, Abiraterone Acetate and Dexamethasone.
Has Dr. Chimezie D. Ubbaonu received payments from drug or device companies?
CMS Open Payments shows $31 in general payments to Dr. Ubbaonu from 1 company from 2017 to 2017. The largest total came from BTG International, Inc.
How long has Dr. Chimezie D. Ubbaonu been practicing?
Dr. Ubbaonu graduated from medical school in 2003, 23 years ago.
Does Dr. Chimezie D. Ubbaonu do research?
Dmand AI links 2 publications to Dr. Ubbaonu.
Who does Dr. Chimezie D. Ubbaonu publish with?
Dr. Ubbaonu's most frequent co-authors are Kari Joanne Kansal, MD (1 shared paper) and Jason Adam Zell, DO (1 shared paper).
What insurance does Dr. Chimezie D. Ubbaonu accept?
Dr. Ubbaonu is in network with 10 carriers, including United Healthcare, Kaiser Permanente and Aetna. HMO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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