Physician

Mark T Duffy, MD

According to 2025 Medicare claims, Mark Duffy, MD (NPI: 1235167537) practices ophthalmology in the Green Bay, WI market, with the plurality of this provider's patient population coming from Brown, WI. This provider's primary affiliated billing organization is BAYCARE CLINIC LLP (NPI: 1588609648; TIN: 391943214) and primary practice location at 54303-4706.

Duffy's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 413 traditional Medicare patients, billed 7,408 HCPCS/CPT codes, and received $192,921 in Medicare payments. The top billing code was 15823 (Removal of excessive skin and fat of upper eyelid). Part D data shows 929 prescription claims across 482 beneficiaries totaling $8,861 in drug costs, led by Erythromycin (Erythromycin Base). 2019 DME data shows 14 claims. 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 declined steadily, from $15,219 to $8,861. 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	412	4,479	$200,121
2016	413	6,523	$216,689
2017	382	9,625	$221,788
2018	420	8,968	$221,549
2019	465	9,763	$268,741
2020	327	7,938	$204,203
2021	396	8,021	$241,342
2022	370	6,293	$180,825
2023	359	7,424	$195,281
2024	413	7,408	$192,921

Part D Events Trend

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

Year	Patients	Claims	Drug Cost
2015	283	663	$15,219
2016	297	712	$10,173
2017	334	810	$10,546
2018	340	780	$7,555
2019	384	819	$11,229
2020	338	743	$9,727
2021	456	853	$9,969
2022	431	809	$8,437
2023	445	808	$7,910
2024	482	929	$8,861

DME Billing Trend

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

Year	Patients	Claims	Payment
2015	11	11	$471
2016	N/R	N/R	N/R
2017	N/R	N/R	N/R
2018	N/R	N/R	N/R
2019	13	14	$661
2020	N/R	N/R	N/R
2021	N/R	N/R	N/R
2022	N/R	N/R	N/R
2023	N/R	N/R	N/R
2024	N/R	N/R	N/R

* / # = 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
15823	Removal of excessive skin and fat of upper eyelid	79	79	$571
99204	New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	136	136	$112
99214	Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	86	86	$82
99203	New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	63	63	$73
92081	Exam of visual field with limited testing	191	192	$23

Top 5 Part D drugs in 2024

By total drug costs.

Drug	Generic	Claims	Total Day Supply	Total Drug Cost
Erythromycin	Erythromycin Base	487	5,652	$5,176
Cephalexin	Cephalexin	199	1,318	$626
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	151	329	$480
Prednisolone Acetate	Prednisolone Acetate	11	258	$280
Azithromycin	Azithromycin	44	220	$114

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 T. Duffy, MD?

Tedicare shows public-source Medicare data for Mark T. Duffy, MD (NPI 1235167537), 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 T. Duffy, MD have ACO affiliation data?

No ACO affiliation record is shown in the available Tedicare data for this profile.

What billing organization is linked to Mark T. Duffy, MD?

Mark T. Duffy, MD is linked to BAYCARE CLINIC LLP (billing NPI 1588609648) in the available physician profile data.

Does Mark T. Duffy, MD 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.