Marilyn Kay Kosier, M.D.
Ophthalmology Physician · Lancaster, OH
Marilyn Kay Kosier, M.D. is an ophthalmology physician with a practice address in Lancaster, Ohio, and NPI 1710169974, issued on Nov 29, 2007. Check the license (Ohio 35-056213, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Marilyn Kay Kosier
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- 35-056213 OH
35-05-6213K OH
Self-reported in NPPES; status is on the state search - Practice location
- 1520 Sheridan Dr, Lancaster, OH 43130
- Phone
- (740) 654-0177
- Enumerated
- Nov 29, 2007
- Record last updated
- May 15, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (740) 654-0505
- Medicaid ID
- 0698142 OH
- Medicare enrollment
- Enrolled (PECOS I20080110000261); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 751 in Ohio → Look up another NPI →
Verify Marilyn Kay Kosier in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35-056213Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average ophthalmology physician in 2024
2,615 Medicare Part D claims for 620 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Prednisolone Acetate352 claims
- Latanoprost322 claims
- Moxifloxacin216 claims
- Brimonidine Tartrate207 claims
- Erythromycin187 claims
- Ketorolac Tromethamine137 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $41.66
2 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. 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.
Marilyn Kay Kosier among 751 ophthalmology physician records in Ohio
Marilyn Kay Kosier, M.D. is one of 751 ophthalmology physician records with a practice address in Ohio. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 58% of them.
- NPI issued2007 · 58% of these records are older, 34% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1980 · median 2002 among the 495 with a school on file
- Record last updated2020 · 62% 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 Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Ohio
There are 751 ophthalmology physician records in Ohio.
All 751 in Ohio → Every provider in Lancaster → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Susmitha Kolli, MDLancaster, OH 431301871582288
- Prafulla Patel, M.D.Lancaster, OH 431301639172364
- Deepa Reddy, M.D.Lancaster, OH 431301699940452
- Jennifer Bogucki, MDGrove City, OH 431231912143587
- Jeffrey Hutchison, DOGrove City, OH 431231609824267
- Michael McLaughlin, DOGrove City, OH 431231972253896
- James Moses, M.D.Grove City, OH 431231831187194
- James Mouser, M.D.Grove City, OH 431231083795892
Common questions
What is Marilyn Kay Kosier, M.D.'s NPI number?
Marilyn Kay Kosier, M.D.'s National Provider Identifier (NPI) is 1710169974, issued on Nov 29, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Marilyn Kay Kosier, M.D. located?
The NPPES record lists a practice address at 1520 Sheridan Dr, Lancaster, OH, 43130. Phone: (740) 654-0177. Providers update this record themselves, so call before visiting.
How can I verify Marilyn Kay Kosier, M.D.'s license?
NPPES lists Ohio license number 35-056213, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marilyn Kay Kosier, M.D. prescribe under Medicare Part D?
In 2024, Marilyn Kay Kosier, M.D. had 2,615 Medicare Part D claims for 620 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Marilyn Kay Kosier, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.