Physician

Mark A Greiner, M.D.

According to 2025 Medicare claims, Mark Greiner, M.D. (NPI: 1194992958) practices ophthalmology in the Iowa City, IA market, with the plurality of this provider's patient population coming from Johnson, IA. This provider's primary affiliated billing organization is STATE UNIVERSITY OF IOWA (NPI: 1477554814; TIN: 426004813) and primary practice location at 52242-1009. Greiner is affiliated with the CoreHealth Alliance LLC (ACO ID: A5645), participating under the MSSP model.

Greiner's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 604 traditional Medicare patients, billed 2,175 HCPCS/CPT codes, and received $165,727 in Medicare payments. The top billing code was 99214 (Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more). Part D data shows 1,309 prescription claims across 356 beneficiaries totaling $83,641 in drug costs, led by Fluorometholone (Fluorometholone). No Open Payments records. You can download detailed data with all billing codes (2015-2024). For more recent data, please contact us.

Over the past 10 years, this provider's Medicare Part B carrier billing has changed little. Concurrently, Part D prescription costs have risen steadily, from $65,106 to $83,641. For DME billing, this provider has fewer than 5 years of reported data, so a reliable trend cannot be assigned.

Part B Carrier Billing Trend

Medicare payment trend, with N of patients and claim lines in the table.

Year	Patients	Clm Lines	Payment
2015	471	1,673	$138,293
2016	456	1,782	$144,384
2017	472	1,981	$161,802
2018	552	2,382	$206,146
2019	593	2,289	$195,390
2020	493	1,839	$151,122
2021	552	2,024	$157,349
2022	641	2,298	$180,065
2023	661	2,342	$170,295
2024	604	2,175	$165,727

Part D Events Trend

Drug cost trend, with N of patients and prescription claims in the table.

Year	Patients	Claims	Drug Cost
2015	193	848	$65,106
2016	192	860	$53,210
2017	209	874	$65,528
2018	242	1,018	$64,661
2019	275	1,089	$80,248
2020	257	1,041	$67,640
2021	285	1,050	$74,824
2022	319	1,168	$80,243
2023	324	1,150	$297,472
2024	356	1,309	$83,641

DME Billing Trend

Medicare payment trend, with N of patients and DME claim records in the table.

No connected DME records

* / # = suppressed by CMS; 0 = reported zero; N/R = not reported or blank.

Top 5 Part B carrier billing codes in 2024

By total payments.

Code	Description	Patients	Clm Lines	Total Payment
99214	Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	400	559	$63
99213	Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more	72	74	$45
92286	Imaging of front third of eye using a special microscope	169	186	$13
92025	Ct scan of cornea	162	180	$12
76514	Ultrasound scan of cornea to determine thickness	384	568	$5

Top 5 Part D drugs in 2024

By total drug costs.

Drug	Generic	Claims	Total Day Supply	Total Drug Cost
Fluorometholone	Fluorometholone	273	15,875	$30,759
Prednisolone Acetate	Prednisolone Acetate	331	13,334	$15,827
Valacyclovir	Valacyclovir Hcl	134	8,005	$7,747
Medroxyprogesterone Acetate	Medroxyprogesterone Acetate	58	401	$7,453
Zirgan	Ganciclovir	13	139	$5,851

Top 5 DME services in 2024

No connected or detailed DME service-level records for 2024.

Open Payments Summary

No connected Open Payments records were found for this physician in General Payments, Research Payments, or Ownership / Investment Interests.

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FAQ

What Medicare data is available for Mark A. Greiner, M.D.?

Tedicare shows public-source Medicare data for Mark A. Greiner, M.D. (NPI 1194992958), including provider identity, specialty, market context, Medicare Part B activity, Part D prescribing, DME records, Open Payments where available, billing organization details, and ACO affiliation signals where available. Profile data covers 2015-2024, with current attribution based on 2025 claims where available.

Does Mark A. Greiner, M.D. have ACO affiliation data?

Mark A. Greiner, M.D. is shown with ACO affiliation data for CoreHealth Alliance LLC (MSSP, ACO ID A5645).

What billing organization is linked to Mark A. Greiner, M.D.?

Mark A. Greiner, M.D. is linked to STATE UNIVERSITY OF IOWA (billing NPI 1477554814) in the available physician profile data.

Does Mark A. Greiner, M.D. have Open Payments data?

No connected Open Payments records are shown for this physician in the available General Payments, Research Payments, or Ownership / Investment Interests data.

Can I download physician-level Medicare data from Tedicare?

Yes. Tedicare provides sample physician export data and paid custom physician data exports for research, planning, outreach, and market analysis. Exports can include physician profile fields, market and specialty context, billing organization details, ACO affiliation signals where available, and Medicare utilization data.