Jason Maasdam, O.D.
Optometrist · Knoxville, IA
Jason Maasdam, O.D. is an optometrist with a practice address in Knoxville, Iowa, and NPI 1922081678, issued on Nov 28, 2005. Check the license (Iowa 02116, as entered in NPPES) with the Iowa board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Jason Maasdam
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 02116 IA
Self-reported in NPPES; status is on the state search - Practice location
- 100 S 5TH St, Knoxville, IA 50138
- Phone
- (641) 842-3616
- Enumerated
- Nov 28, 2005
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (641) 842-5453
- Medicaid ID
- 2176891 IA
- Medicare enrollment
- Enrolled (PECOS I20050421001087); accepts Medicare assignment
- Medical or professional school
- Illinois College Of Optometry At Chicago, 1998
- Entity
- Type 1 · individual
Also registered at 100 S 5TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lily Mark -Maasdam, O.D.Optometrist1477536423
Verify Jason Maasdam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Iowa board licenses this profession
Search for license 02116Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% more Medicare Part D claims than the average optometrist in 2024
486 Medicare Part D claims for 144 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Latanoprost158 claims
- Timolol Maleate64 claims
- Restasis46 claims
- Dorzolamide-Timolol35 claims
- Lumigan22 claims
- Moxifloxacin18 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: $38.30
2 payments; by number, the most common kind was food and beverage; the largest payer was Tarsus Pharmaceuticals, Inc. The 34,453 providers of this specialty with any payment received $769.99 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
- Eye Health Solutions PCKnoxville, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
2 optometrist records list a practice address in Knoxville
They are 2 of the 132 NPPES records with a practice address in Knoxville, and 676 optometrist records in Iowa.
All 2 in Knoxville → All 676 in Iowa → Every provider in Knoxville →
Other optometrist records in Iowa
- Ryan Ackerman, O.D.Rock Rapids, IA1770692311
- Katie Adams, ODWest Union, IA1710500251
- Paul Ahern, O.D.Dyersville, IA1104892116
- George Alberhasky, O.D., P.C.Iowa City, IA1013036425
- Troy Albrecht, ODMarion, IA1053392522
- Steven Aljets, O.D.West Des Moines, IA1790745602
- Daniel Alletto, ODCenterville, IA1043668700
- John Altfillisch, ODOttumwa, IA1154420172
- Mark Altfillisch, ODOttumwa, IA1093814014
- Jeffrey Anderson, O.D.Boone, IA1760466098
Common questions
What is Jason Maasdam, O.D.'s NPI number?
Jason Maasdam, O.D.'s National Provider Identifier (NPI) is 1922081678, issued on Nov 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jason Maasdam, O.D. located?
The NPPES record lists a practice address at 100 S 5TH St, Knoxville, IA, 50138. Phone: (641) 842-3616. Providers update this record themselves, so call before visiting.
How can I verify Jason Maasdam, O.D.'s license?
NPPES lists Iowa license number 02116, as entered by the provider. Search the Iowa board that licenses this profession; the NPPES record confirms identity only.
How much does Jason Maasdam, O.D. prescribe under Medicare Part D?
In 2024, Jason Maasdam, O.D. had 486 Medicare Part D claims for 144 beneficiaries; the average among optometrist prescribers was 277. 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.