Mark A. Greiner, M.D.
Ophthalmology Physician · Iowa City, IA
Mark A. Greiner, M.D. is an ophthalmology physician with a practice address in Iowa City, Iowa, and NPI 1194992958, issued on May 12, 2008. Check the license (Iowa 40489, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark A. Greiner
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 40489 IA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Hawkins Dr, Iowa City, IA 52242
- Phone
- (319) 356-2861
- Enumerated
- May 12, 2008
- Record last updated
- Aug 16, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (319) 356-0363
- Medicare enrollment
- Enrolled (PECOS I20121113000403); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 220 in Iowa → Look up another NPI →
Also registered at 200 Hawkins Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark A. Greiner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 40489Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,309 Medicare Part D claims for 356 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Prednisolone Acetate331 claims
- Fluorometholone273 claims
- Valacyclovir134 claims
- Moxifloxacin107 claims
- Medroxyprogesterone Acetate58 claims
- Doxycycline Hyclate51 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.
Bills Medicare through one group practice
- State University OF IowaCoralville, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark A. Greiner among 220 ophthalmology physician records in Iowa
Mark A. Greiner, M.D. is one of 220 ophthalmology physician records with a practice address in Iowa. 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 2008, is newer than 58% of them.
- NPI issued2008 · 58% of these records are older, 39% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2007 · median 2006 among the 123 with a school on file
- Record last updated2012 · 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 Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 ophthalmology physician records list a practice address in Iowa City
They are 94 of the 7,163 NPPES records with a practice address in Iowa City, and 220 ophthalmology physician records in Iowa.
All 220 in Iowa → Every provider in Iowa City → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Michael Abramoff, MD, PHDIowa City, IA 522421578564639
- Wallace Alward, MDIowa City, IA 522421063413417
- Herbert Boldt, MDIowa City, IA 522421558362871
- Keith Carter, MDIowa City, IA 522421942201082
- John Fingert, MDIowa City, IA 522421306847454
- James Folk, MDIowa City, IA 522421316948490
- Karen Gehrs, MDIowa City, IA 522421669473732
- Emily Greenlee, MDIowa City, IA 522421710979919
Common questions
What is Mark A. Greiner, M.D.'s NPI number?
Mark A. Greiner, M.D.'s National Provider Identifier (NPI) is 1194992958, issued on May 12, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mark A. Greiner, M.D. located?
The NPPES record lists a practice address at 200 Hawkins Dr, Iowa City, IA, 52242. Phone: (319) 356-2861. Providers update this record themselves, so call before visiting.
How can I verify Mark A. Greiner, M.D.'s license?
NPPES lists Iowa license number 40489, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark A. Greiner, M.D. prescribe under Medicare Part D?
In 2024, Mark A. Greiner, M.D. had 1,309 Medicare Part D claims for 356 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.