Registry data as of Aug 27, 2026

Charles Allen, M.D.

Family Medicine Physician · Oconomowoc, WI

Charles Allen, M.D. is a family medicine physician with a practice address in Oconomowoc, Wisconsin, and NPI 1871804336, issued on Jun 29, 2010. Check the license (Wisconsin 61157-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, loaded Aug 27, 2026 · Medicare files 2023 and 2024 · method · Verify with CMS →

NPPES recordas of Aug 27, 2026
1871804336
Name
Charles Allen
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
61157-020 WI
Self-reported in NPPES; status is on the state search
Practice location
1185 Corporate Center Dr, Oconomowoc, WI 53066
Phone
(262) 928-8400
Enumerated
Jun 29, 2010
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 1185 Corporate Center Dr

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Katherine Brockway, NPRegistered Nurse1891500906
  2. Dan Cleary, MDInternal Medicine Physician1972615136
  3. Eric Conradson, M.D.Internal Medicine Physician1518976232
  4. Firas Ghanem, M.D.Internal Medicine Physician1124008529
  5. John Gucciardi, M.D.Family Medicine Physician1760417430
  6. Brett Linzer, M.D.Internal Medicine Physician1083686653

Verify Charles Allen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 61157-020    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
Open the Wisconsin license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

90% fewer Medicare Part D claims than the average family medicine physician in 2024

342 Medicare Part D claims for 290 beneficiaries, against an average of 3,519 among the 111,126 providers of this specialty who prescribed in Part D.

  1. Charles Allen342
  2. Specialty average3,519

Most prescribed

  1. Nitrofurantoin Mono-Macro67 claims
  2. Prednisone57 claims
  3. Amoxicillin-Clavulanate Potass37 claims
  4. Cephalexin26 claims
  5. Polymyxin B Sul-Trimethoprim20 claims
  6. Doxycycline Monohydrate18 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.

One hospital or facility affiliation

  1. Prohealth Medical Group IncOconomowoc, WI

Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

12 family medicine physician records list a Oconomowoc practice address

They are 12 of the 506 NPPES records with a Oconomowoc practice address, and 3,629 family medicine physician records in Wisconsin.

All 12 in Oconomowoc → All 3,629 in Wisconsin → Every provider in Oconomowoc →

Other family medicine physician records in Wisconsin

  1. Ghudran Abdulal, MDNew Berlin, WI1083622666
  2. Vanessa Abejuela-Matt, D.O.Mount Pleasant, WI1558687749
  3. Benjamin Abeyta, M.D.Wauwatosa, WI1447511597
  4. Emily Abeyta, MDWaukesha, WI1386905107
  5. Islam Abo Al Nadie, MDMilwaukee, WI1326618786
  6. Jeanette Abraham, MDWeston, WI1205895810
  7. Sarada Abraham, M.D.Oconomowoc, WI1962851972
  8. Kirsten Abramson, MDMadison, WI1417909979
  9. Alexandra Adams, MD PHDMadison, WI1184689291
  10. David AdamsMadison, WI1992986897

Common questions

What is Charles Allen, M.D.'s NPI number?

Charles Allen, M.D.'s National Provider Identifier (NPI) is 1871804336, issued on Jun 29, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Charles Allen, M.D. located?

The NPPES record lists a practice address at 1185 Corporate Center Dr, Oconomowoc, WI, 53066. Phone: (262) 928-8400. Providers update this record themselves, so call before visiting.

How can I verify Charles Allen, M.D.'s license?

NPPES lists Wisconsin license number 61157-020, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Charles Allen, M.D. prescribe under Medicare Part D?

In 2024, Charles Allen, M.D. had 342 Medicare Part D claims for 290 beneficiaries; the average among family medicine physician prescribers was 3,519. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.