Johnny Cai, DO
Hematology & Oncology Physician · Dublin, CA
Johnny Cai, DO is a hematology & oncology physician with a practice address in Dublin, California, and NPI 1861998452, issued on Apr 3, 2018. Check the license (California 20A19125, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Johnny Cai
- Credential
- DO
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 20A19125 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4000 Dublin Blvd, Dublin, CA 94568
- Phone
- (510) 498-2335
- Enumerated
- Apr 3, 2018
- Record last updated
- Aug 28, 2024
- Medicare enrollment
- Enrolled (PECOS I20240809003586); accepts Medicare assignment
- Medical or professional school
- Touro Un College Of Osteopathic Medicine, Vallejo, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 4000 Dublin Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jassimran Bainiwal, MDCardiovascular Disease Physician1225532633
- Sonja Bauer, PTPhysical Therapist1285084772
- Aditya Bhargava, M.D.Sleep Medicine (Internal Medicine) Physician1114938032
- Deval Bhatt, M.D.Endocrinology, Diabetes & Metabolism Physician1326385659
- Sai Bhuvanagiri, M.D.Endocrinology, Diabetes & Metabolism Physician1134652266
- Lisa Biga, NPObstetrics & Gynecology Nurse Practitioner1497107890
Verify Johnny Cai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A19125Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
135 Medicare Part D claims for 35 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims.
Most prescribed
- Hydroxyurea11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $243.55
7 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationFremont, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Johnny Cai among 1,583 hematology & oncology physician records in California
Johnny Cai, DO is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 92% of them.
- NPI issued2018 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2018 · median 2003 among the 1,124 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Dublin → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Amanpreet Buttar, MDDublin, CA 945681962679753
- Bao Dao, MDDublin, CA 945681033349485
- Shelly Gupta, MDDublin, CA 945681831558329
- Steven Turman, MDPinole, CA 945641265508642
- Gregory Smith, M.D.St Helena, CA 945741265408447
- Ming Kuan, M.D.San Leandro, CA 945771043279995
- Kenneth PoonSan Leandro, CA 945771366768541
- Gail Wagner, M.D.San Leandro, CA 945771780756593
Common questions
What is Johnny Cai, DO's NPI number?
Johnny Cai, DO's National Provider Identifier (NPI) is 1861998452, issued on Apr 3, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Johnny Cai, DO located?
The NPPES record lists a practice address at 4000 Dublin Blvd, Dublin, CA, 94568. Phone: (510) 498-2335. Providers update this record themselves, so call before visiting.
How can I verify Johnny Cai, DO's license?
NPPES lists California license number 20A19125, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Johnny Cai, DO prescribe under Medicare Part D?
In 2024, Johnny Cai, DO had 135 Medicare Part D claims for 35 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.