Zhengjin Cao, M.D.
Internal Medicine Physician · Dubuque, IA
Zhengjin Cao, M.D. is an internal medicine physician with a practice address in Dubuque, Iowa, and NPI 1861616039, issued on Apr 12, 2007. Check the license (Iowa 37147, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Zhengjin Cao
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 37147 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1515 Delhi St, Dubuque, IA 52001
- Phone
- (563) 557-9111
- Enumerated
- Apr 12, 2007
- Record last updated
- Apr 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (563) 589-4046
- Medicaid ID
- 34793200 WI
- Medicare enrollment
- Enrolled (PECOS I20070713000276); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 871 in Iowa → Look up another NPI →
Also registered at 1515 Delhi St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rebekah Bond, M.D.Hospitalist Physician1588633002
- Richard Fairley, M.D.Internal Medicine Physician1801862552
- Krishnarao Gorrepati, MDGastroenterology Physician1588624811
- Angela Hubanks, PA-CMedical Physician Assistant1356538300
- Ronald Iverson, M.D.Endocrinology, Diabetes & Metabolism Physician1265407589
- Alexander Johnson, M.D.Hospitalist Physician1023077559
Verify Zhengjin Cao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 37147Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6.2 times the Medicare Part D claims of the average internal medicine physician in 2024
19,708 Medicare Part D claims for 880 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 824 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,090 claims
- Omeprazole803 claims
- Potassium Chloride654 claims
- Losartan Potassium607 claims
- Furosemide594 claims
- Amlodipine Besylate557 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: $147.51
9 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Iowa Physicians Clinic Medical FoundationDubuque, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zhengjin Cao among 871 internal medicine physician records in Iowa
Zhengjin Cao, M.D. is one of 871 internal medicine physician records with a practice address in Iowa. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 38% of them.
- NPI issued2007 · 38% of these records are older, 58% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 44% of these records are
- Graduated1988 · median 2008 among the 386 with a school on file
- Record last updated2021 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
30 internal medicine physician records list a practice address in Dubuque
They are 30 of the 1,468 NPPES records with a practice address in Dubuque, and 871 internal medicine physician records in Iowa.
All 871 in Iowa → Every provider in Dubuque → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Catherine Crall, M.D.Dubuque, IA 520011104896273
- Richard Fairley, M.D.Dubuque, IA 520011801862552
- Angela Kelley, D.O.Dubuque, IA 520011881654473
- Matthew Kirkendall, M.D.Dubuque, IA 520011821067794
- Cynthia Konz, M.D.Dubuque, IA 520011013986918
- Ian Koontz, M.D.Dubuque, IA 520011205805199
- Philip Leeson, M.D.Dubuque, IA 520011932175676
- Mark Liaboe, M.D.Dubuque, IA 520011194794321
Common questions
What is Zhengjin Cao, M.D.'s NPI number?
Zhengjin Cao, M.D.'s National Provider Identifier (NPI) is 1861616039, issued on Apr 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Zhengjin Cao, M.D. located?
The NPPES record lists a practice address at 1515 Delhi St, Dubuque, IA, 52001. Phone: (563) 557-9111. Providers update this record themselves, so call before visiting.
How can I verify Zhengjin Cao, M.D.'s license?
NPPES lists Iowa license number 37147, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Zhengjin Cao, M.D. prescribe under Medicare Part D?
In 2024, Zhengjin Cao, M.D. had 19,708 Medicare Part D claims for 880 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.