Clarence G. Tam, MD
Ophthalmology Physician · Fond Du Lac, WI
Clarence G. Tam, MD is an ophthalmology physician with a practice address in Fond Du Lac, Wisconsin, and NPI 1447365960, issued on Aug 21, 2006. Check the license (Wisconsin 41026, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Clarence G. Tam
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 41026 WI
Self-reported in NPPES; status is on the state search - Practice location
- 421 Camelot Dr, Fond Du Lac, WI 54935
- Phone
- (920) 926-8472
- Enumerated
- Aug 21, 2006
- Record last updated
- Oct 21, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (920) 926-8391
- Medicaid ID
- 32549400 WI
- Medicare enrollment
- Enrolled (PECOS I20100615000320); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 441 in Wisconsin → Look up another NPI →
Also registered at 421 Camelot Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Deborah Anderson, PT CEESPhysical Therapist1649213877
- Nicole Auxier, MA CCC-AAudiologist1174514889
- Krista Behling, DPTPhysical Therapist1689075590
- Elizabeth Bensen, M.D.Physical Medicine & Rehabilitation Physician1366433435
- Robert Bertram, DPMFoot & Ankle Surgery Podiatrist1578908042
- Ashley Beyer, LATAthletic Trainer1306379433
Verify Clarence G. Tam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 41026Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,215 Medicare Part D claims for 321 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Latanoprost378 claims
- Prednisolone Acetate178 claims
- Timolol Maleate175 claims
- Dorzolamide-Timolol159 claims
- Brimonidine Tartrate108 claims
- Cyclosporine23 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: $15.06
1 payment: food and beverage; the largest payer was Alcon Vision LLC. The 13,221 providers of this specialty with any payment received $4,535.02 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
- Agnesian Healthcare IncFond Du Lac, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clarence G. Tam among 441 ophthalmology physician records in Wisconsin
Clarence G. Tam, MD is one of 441 ophthalmology physician records with a practice address in Wisconsin. 71% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 38% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1995 · median 2005 among the 259 with a school on file
- Record last updated2020 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Wisconsin
There are 441 ophthalmology physician records in Wisconsin.
All 441 in Wisconsin → Every provider in Fond Du Lac → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Adam Strittmatter, DOFond Du Lac, WI 549351962700229
- David Sweet, MDFond Du Lac, WI 549351245213560
- Ada Hall, MDMenasha, WI 549521184619660
- Joseph Neilitz, DOMenasha, WI 549521043473234
- Kathy Vogel, MDAppleton, WI 549151164416160
- Michael Wage, MD, PHDAppleton, WI 549151962497370
- Colleen Corbett, M.D.Appleton, WI 549141528078011
- Marvin Hall, MDAppleton, WI 549141285674655
Common questions
What is Clarence G. Tam, MD's NPI number?
Clarence G. Tam, MD's National Provider Identifier (NPI) is 1447365960, issued on Aug 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Clarence G. Tam, MD located?
The NPPES record lists a practice address at 421 Camelot Dr, Fond Du Lac, WI, 54935. Phone: (920) 926-8472. Providers update this record themselves, so call before visiting.
How can I verify Clarence G. Tam, MD's license?
NPPES lists Wisconsin license number 41026, 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 Clarence G. Tam, MD prescribe under Medicare Part D?
In 2024, Clarence G. Tam, MD had 1,215 Medicare Part D claims for 321 beneficiaries; the average among ophthalmology physician prescribers was 1,518. 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.