NPPES file of Aug 9, 2026

Ayham Chamseddin, M.D.

Endocrinology, Diabetes & Metabolism Physician · Oshkosh, WI

Ayham Chamseddin, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Oshkosh, Wisconsin, and NPI 1932135324, issued on Jun 25, 2006. Check the license (Wisconsin 49699-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1932135324
Name
Ayham Chamseddin
Credential
M.D.
Primary taxonomy
Endocrinology, Diabetes & Metabolism Physician 207RE0101X
License numbers
49699-20 WI
ME113565 FL
Self-reported in NPPES; status is on the state search
Practice location
855 N Westhaven Dr, Oshkosh, WI 54904
Phone
(920) 303-8700
Enumerated
Jun 25, 2006
Record last updated
Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicaid ID
34717100 WI
Medicare enrollment
Enrolled (PECOS I20060929000512); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest endocrinology, diabetes & metabolism physician records → All 187 in Wisconsin → Look up another NPI →

Also registered at 855 N Westhaven Dr

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

  1. Rami Abumasmah, MDHematology & Oncology Physician1972779551
  2. Abdulmajid AdamHospitalist Physician1528362258
  3. Awais Ahmed, MDGastroenterology Physician1316213481
  4. Kate Alexander, PA-CPhysician Assistant1700466414
  5. Hussein Alramini, M.D.Hospitalist Physician1497106512
  6. Ammar Alzoubi, MDInternal Medicine Physician1598773152

Verify Ayham Chamseddin in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 49699-20    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.

Is this page about you? You can ask us to correct, restrict or remove it: how.

26% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024

1,937 Medicare Part D claims for 220 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 54% of claims.

  1. Ayham Chamseddin1,937
  2. Specialty average2,630

Most prescribed

  1. Levothyroxine Sodium247 claims
  2. Jardiance165 claims
  3. Mounjaro133 claims
  4. Ezetimibe105 claims
  5. Lantus Solostar88 claims
  6. Metformin Hcl86 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: $70.97

1 payment: food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Ayham Chamseddin$70.97
  2. Specialty average$5,742.15

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

  1. Aurora Medical Group, Inc.Oshkosh, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Ayham Chamseddin among 187 endocrinology, diabetes & metabolism physician records in Wisconsin

Ayham Chamseddin, M.D. is one of 187 endocrinology, diabetes & metabolism physician records with a practice address in Wisconsin. 81% 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 9% of them.

  • NPI issued2006 · 9% of these records are older, 55% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 72% of these records are
  • Graduated1996 · median 2003 among the 134 with a school on file
  • Record last updated2021 · 48% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Endocrinology, Diabetes & Metabolism Physician providers in Wisconsin

There are 187 endocrinology, diabetes & metabolism physician records in Wisconsin.

All 187 in Wisconsin → Every provider in Oshkosh → Endocrinology, Diabetes & Metabolism Physician nationwide →

The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes

  1. Lindsay Bromley, MDOshkosh, WI 549041659536126
  2. Cynthia Leigh, MDOshkosh, WI 549041942294517
  3. Iftikhar Malik, MDAppleton, WI 549111780616136
  4. Laura Andrews, MDMenasha, WI 549521548254535
  5. Sorin Herscovici, M.D.Menasha, WI 549521568429272
  6. Junting Degrood, MDNeenah, WI 549561871190058
  7. John Mihailidis, M.D.Neenah, WI 549561194036533
  8. Vinay Patel, M.D.Neenah, WI 549561477764744

Common questions

What is Ayham Chamseddin, M.D.'s NPI number?

Ayham Chamseddin, M.D.'s National Provider Identifier (NPI) is 1932135324, issued on Jun 25, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Ayham Chamseddin, M.D. located?

The NPPES record lists a practice address at 855 N Westhaven Dr, Oshkosh, WI, 54904. Phone: (920) 303-8700. Providers update this record themselves, so call before visiting.

How can I verify Ayham Chamseddin, M.D.'s license?

NPPES lists Wisconsin license number 49699-20, 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 Ayham Chamseddin, M.D. prescribe under Medicare Part D?

In 2024, Ayham Chamseddin, M.D. had 1,937 Medicare Part D claims for 220 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.