William B. Manzel, M.D.
Internal Medicine Physician · Dubuque, IA
William B. Manzel, M.D. is an internal medicine physician with a practice address in Dubuque, Iowa, and NPI 1508817131, issued on May 16, 2006. Check the license (Iowa 21935, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- William B. Manzel
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 21935 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1000 Langworthy St, Dubuque, IA 52001
- Phone
- (563) 584-3430
- Enumerated
- May 16, 2006
- Record last updated
- Nov 25, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (563) 584-3394
- Medicaid ID
- 1189100 IA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 871 in Iowa → Look up another NPI →
Also registered at 1000 Langworthy St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Louis Alt, M.D.Otolaryngology Physician1902855778
- Courtney Ambrosy, PA-CPhysician Assistant1457121345
- Sarah ArnoldMedical Physician Assistant1558016113
- Paula Aston, MDNeurology Physician1144286675
- Kala Ave-Lallemant, FNPFamily Nurse Practitioner1235551656
- Martin Bagby, DOFamily Medicine Physician1942269402
Verify William B. Manzel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 21935Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
24 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Gabapentin12 claims
- Potassium Chloride12 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.
William B. Manzel among 871 internal medicine physician records in Iowa
William B. Manzel, 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 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 62% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 44% of these records are
- Record last updated2009 · 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 William B. Manzel, M.D.'s NPI number?
William B. Manzel, M.D.'s National Provider Identifier (NPI) is 1508817131, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William B. Manzel, M.D. located?
The NPPES record lists a practice address at 1000 Langworthy St, Dubuque, IA, 52001. Phone: (563) 584-3430. Providers update this record themselves, so call before visiting.
How can I verify William B. Manzel, M.D.'s license?
NPPES lists Iowa license number 21935, 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 William B. Manzel, M.D. prescribe under Medicare Part D?
In 2024, William B. Manzel, M.D. had 24 Medicare Part D claims; 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.