Dr. Mark A. Greiner, MD
- Medicare services, 2024
- 2,031
- Medicare patients, 2024
- 604
- Part D claims, 2024
- 1,309
- Publications
- 60
- MIPS score, 2024
- 80
- Practice address
- 200 Hawkins Drive, Iowa City, IA 52242
- Practice phone
- Call (319) 356-1616
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Greiner's professional email, personal email and mobile number
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Dr. Mark A. Greiner is an ophthalmologist in Iowa City, Iowa
Dr. Greiner practices at University of Iowa Health Care Medical Center in Iowa City, Iowa, part of The University of Iowa.
Dr. Greiner's NPI, 1194992958, was assigned on May 12, 2008. Dr. Greiner graduated from University of California, Davis School of Medicine in 2007. Dr. Greiner holds Iowa license 40489.
- NPI
- 1194992958NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961680848
- NPI enumeration date
- May 12, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (319) 356-1616
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark A. Greiner practices at University of Iowa Health Care Medical Center in Iowa City, Iowa
Dr. Greiner's primary practice is University of Iowa Health Care Medical Center, at 200 Hawkins Drive, Iowa City, IA 52242 in Johnson County. The practice phone is (319) 356-1616.
- University of Iowa Health Care Medical Center200 Hawkins Drive, Iowa City, IA 52242 · Johnson CountyPhone(319) 356-1616
Source: Dmand AI Affiliation Data
Dr. Mark A. Greiner is affiliated with 2 sites of care and 1 medical group
Dr. Greiner's primary practice is University of Iowa Health Care Medical Center in Iowa City, Iowa, part of The University of Iowa. Dr. Greiner is also affiliated with UnityPoint Health - St. Luke's Hospital - Cedar Rapids. The medical group on file is Scanlan Center for School Mental Health Clinic.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark A. Greiner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Greiner practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University of Iowa Health Care Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Mark A. Greiner is one of 180 ophthalmologists in Iowa
Ophthalmology is Dr. Greiner's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Greiner is licensed in Iowa.
Specialties and state licenses
- Ophthalmology, IowaPrimary
Ophthalmologists near Dr. Greiner
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark A. Greiner billed Medicare for 2,031 services in 2024
CMS data shows 2,031 Medicare services from Dr. Greiner across 15 procedure codes in 2024, for 604 Medicare patients. Medicare paid $138,345 for them.
Dr. Greiner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7552024: 7136%
- Tests and treatments
- 2023: 7262024: 61815%
- Imaging
- 2023: 6142024: 5687%
- Surgery
- 2023: 1292024: 1322%
Where Dr. Greiner's Medicare services took place, 2024
- In an office291%
- In a facility2,00299%
Dr. Greiner compared with the Iowa median for ophthalmologists, 2024
- Dr. Greiner
- Iowa median
- Medicare services
- 2,031vs 1,79213% above
- Medicare patients
- 604vs 66910% below
- Part D claims
- 1,248vs 3963.2 times
Medians across 183 ophthalmologists in Iowa with Dmand AI profiles that report each measure.
Dr. Greiner's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark A. Greiner treated 604 Medicare patients in 2024, average age 75
CMS counts 604 Medicare patients who saw Dr. Greiner in 2024. The largest group is 65 to 74, with 267 patients. 71% of them have high blood pressure, and 70% have high cholesterol. 7% are also on Medicaid. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Greiner's median patient age at 75, with 55% women.
Dr. Greiner's Medicare patients by age, 2024
Dr. Greiner's Medicare patients by sex, 2024
- Women34958%
- Men25542%
Chronic conditions among Dr. Greiner's Medicare patients, 2024
- High blood pressure71%
- High cholesterol70%
- Arthritis45%
- Diabetes26%
- Chronic kidney disease22%
- Ischemic heart disease22%
- Mood disorders21%
- Depression20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Greiner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark A. Greiner wrote 1,309 Medicare Part D claims in 2024
In 2024, Dr. Greiner wrote 1,309 Medicare Part D claims for 356 patients. 52% of them were for generic drugs. CMS names the drug for 1,248 of them, across 19 drugs with 11 or more claims each, at $75,502 in total drug cost. In 2023, CMS named 1,041 claims across 16 drugs.
Dr. Greiner's Part D claims by kind of drug, 2024
- Generic686 claims52%
- Brand-name623 claims48%
Dr. Greiner's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Greiner's Part D claims, 2024
- Antibiotics7%92 of 1,309 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,0412024: 1,24820%
Drugs named by CMS: 19 in 2024, 16 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mark A. Greiner scored 80 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 80 out of 100 for Dr. Greiner for performance year 2024, reported as part of a group. Dr. Greiner accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 82 procedures of cataract surgery by Dr. Greiner, more than 71% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Greiner's MIPS scores, performance year 2024
- 80of 100Final score
- 75.7of 100Quality
- 78of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Greiner ranks in Medicare procedure volume
- Cataract surgery
- 71st percentile82 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Mark A. Greiner has 60 publications on record
Dmand AI links 60 papers to Dr. Greiner, published from 2015 to 2025. 2024 was the busiest year, with 6. The most frequent topics are Endothelium, Corneal, Visual Acuity and Cornea. Dr. Greiner has published most often in Cornea. Dr. Greiner's most frequent co-authors are Gregory A. Schmidt, MD, Michael Dean Wagoner, MD and Kimberlee A. Burckart, MD.
Dr. Greiner's papers by year, 2015 to 2025
Topics Dr. Greiner writes about most
- Endothelium, Corneal
- Visual Acuity
- Cornea
- Corneal Diseases
- Graft Survival
- Postoperative Complications
- Tissue Donors
- Descemet Stripping Endothelial Keratoplasty
Dr. Greiner's most frequent co-authors
- Gregory A. Schmidt, MD23 shared papers
- Michael Dean Wagoner, MD17 shared papers
- Kimberlee A. Burckart, MD6 shared papers
Recent publications by Dr. Greiner
See who Dr. Greiner researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Greiner works with, so you can find a warm path to the right ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark A. Greiner graduated from University of California, Davis School of Medicine
Dr. Greiner graduated from University of California, Davis School of Medicine in 2007.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark A. Greiner's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark A. Greiner
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark A. Greiner's NPI number?
Dr. Mark A. Greiner's NPI number is 1194992958. It was assigned on May 12, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark A. Greiner?
Dr. Mark A. Greiner is an ophthalmologist in Iowa City, Iowa. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Mark A. Greiner practice?
Dr. Greiner practices at 200 Hawkins Drive, Iowa City, IA 52242. Dr. Greiner's primary practice is University of Iowa Health Care Medical Center in Iowa City, Iowa, part of The University of Iowa.
What is Dr. Mark A. Greiner's office phone number?
The practice phone on file for Dr. Greiner is (319) 356-1616.
What is Dr. Mark A. Greiner's medical license number?
Dr. Greiner holds Iowa license 40489.
Which hospitals is Dr. Mark A. Greiner affiliated with?
Dr. Greiner practices at University of Iowa Health Care Medical Center in Iowa City, Iowa. Dr. Greiner is also affiliated with UnityPoint Health - St. Luke's Hospital - Cedar Rapids.
What medical group is Dr. Mark A. Greiner part of?
Dr. Greiner is linked to Scanlan Center for School Mental Health Clinic.
Does Dr. Mark A. Greiner accept Medicare?
Yes. CMS data shows Dr. Greiner billed Medicare for 2,031 services in 2024, and Dr. Greiner accepts Medicare assignment.
What is Dr. Mark A. Greiner's MIPS score?
Dr. Greiner's MIPS final score for performance year 2024 is 80 out of 100, reported as part of a group.
How many Medicare patients does Dr. Mark A. Greiner see?
CMS counts 604 Medicare patients who saw Dr. Greiner in 2024, with an average age of 75.
Show 6 more questionsShow fewer questions
What services does Dr. Mark A. Greiner bill to Medicare?
In 2024, Dr. Greiner's most billed Medicare services were ultrasound (76514), office visit, established patient (99214) and eye exam or test (92286).
Where did Dr. Mark A. Greiner go to medical school?
Dr. Greiner graduated from University of California, Davis School of Medicine in 2007.
What drugs does Dr. Mark A. Greiner prescribe most?
In 2024 Medicare Part D data, Dr. Greiner's most prescribed drugs by claims were Prednisolone Acetate, Fluorometholone and Valacyclovir.
How long has Dr. Mark A. Greiner been practicing?
Dr. Greiner graduated from medical school in 2007, 19 years ago.
Does Dr. Mark A. Greiner do research?
Dmand AI links 60 publications to Dr. Greiner, published from 2015 to 2025.
Who does Dr. Mark A. Greiner publish with?
Dr. Greiner's most frequent co-authors are Gregory A. Schmidt, MD (23 shared papers), Michael Dean Wagoner, MD (17 shared papers) and Kimberlee A. Burckart, MD (6 shared papers).
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