MARK T DUFFY MD
NPI 1235167537
Ophthalmology - Ophthalmic Plastic and Reconstructive Surgery in Green Bay, WI

Q: What is Mark Duffy's NPI number?

The NPI number for Mark Duffy is 1235167537. It was assigned to this individual provider in the NPPES registry on June 28, 2006.

Q: What is Mark Duffy's specialty?

The primary specialty registered for this NPI is Ophthalmology, specializing in Ophthalmic Plastic and Reconstructive Surgery, with taxonomy code 207WX0200X.

Q: When was this NPI record last updated?

The NPPES record for Mark Duffy was last updated on April 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 28, 2006PECOS EnrolledAccepts Medicare Assignment

77.33/100

CMS Quality Rating

2253 W MASON ST, GREEN BAY, WI 54303(920) 327-7000(920) 327-7005 Get Directions Write a Review

NPPES record last updated: April 21, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Apr 21, 2026, Apr 9, 2024, Nov 20, 2017 and 1 more (4 updates tracked since 2016).

On this page

About Mark T Duffy Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK T DUFFY MD (NPI 1235167537) is an individual ophthalmic plastic and reconstructive surgery provider in Green Bay, Wisconsin, licensed in Wisconsin (47208) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Aurora Baycare Medical Ctr, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1992).

NPPES Registry Identity

NPI1235167537

Entity TypeIndividualMale

Primary Taxonomy207WX0200X

Provider Legal NameMARK T DUFFYCredential: MD

Location Address2253 W MASON STGreen Bay, WI 54303-4706

Mailing Address1035 Kepler DrGreen Bay, WI 54311-8320 · (920) 490-9046 · Fax (920) 405-8005

Phone(920) 327-7000

Fax(920) 327-7005

Sole ProprietorNo

Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 1992

Enumeration DateJune 28, 2006

Last NPPES UpdateApril 21, 20264 updates tracked since enumeration

NPPES CertifiedApril 21, 2026

✔ NPI 1235167537 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOphthalmology · Ophthalmic Plastic and Reconstructive SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207WX0200X

License✔ Licensed in WI · 47208

Definition

A physician who specializes in oculofacial plastic and reconstructive surgery. This subspecialty combines orbital and periocular surgery with facial plastic surgery, and includes aesthetic and reconstructive surgery of the face, orbit, eyelid, and lacrimal system. Practitioners evaluate, diagnose and treat conditions involving the eyelids, brows, midface, orbits, lacrimal systems and surrounding and supporting structures of the face and neck.

Also ListedOphthalmologyTaxonomy 207W00000X · License 47208 (WI)

2253 W MASON ST, Green Bay, WI 54303

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Other Identifiers 1

Medicaid34564300WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Louisiana, CareSource (Common Ground Healthcare) and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mark T Duffy Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3678549607

PECOS Enrollment IDI20040909001085

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 14

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, onabotulinumtoxina, 1 unit J0585

Onabotulinumtoxina, also known as Botox, is a medication injected into muscles. It's used to treat various conditions by blocking nerve activity in the muscles, causing a temporary reduction in muscle activity. The units refer to the dosage.

6,497 services25 patients

Exam of visual field with limited testing 92081

An exam of the visual field with limited testing is a quick check of your peripheral vision. It involves identifying objects or movements at the edge of your sight, helping to detect any vision loss that isn't obvious, such as blind spots or areas of reduced vision.

192 services191 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

136 services136 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

86 services86 patients

Removal of excessive skin and fat of upper eyelid 15823

This procedure, also known as upper eyelid surgery, is performed to remove excess skin and fat from the upper eyelid. It can help improve vision if heavy eyelids hinder it, and can also enhance the appearance of the eyes. It's a common, safe procedure.

79 services79 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

63 services63 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

57 services53 patients

Injection of chemical for paralysis of nerve muscles on side of face 64612

This procedure involves injecting a chemical into specific facial nerves, causing temporary muscle paralysis. It's used to treat conditions like facial spasms or wrinkles. The effects are usually temporary, requiring repeat treatments.

56 services19 patients

Repair of brow paralysis 67900

Repair of brow paralysis is a procedure aimed to restore function and symmetry to the face. This is achieved by adjusting muscles and nerves in the brow area. It can help improve the appearance and movement of the forehead and eyebrows, enhancing overall facial expressions.

27 services27 patients

Dilation of tear drainage opening 68801

Dilation of the tear drainage opening is a minor procedure to widen the tear ducts and improve tear flow. A thin instrument is gently inserted into the tear duct to expand it. This can help alleviate symptoms like watery eyes or infections caused by blocked tear ducts.

27 services23 patients

Extensive repair of turning-outward eyelid defect 67917

This procedure corrects an eyelid defect where the eyelid turns outward, exposing the eye. The extensive repair involves surgical techniques to reshape the eyelid and ensure it functions properly. This helps protect the eye and improve comfort.

20 services20 patients

Repair of tendon of upper eyelid 67904

Repair of the tendon of the upper eyelid is a surgical procedure aimed at fixing a droopy eyelid. This condition can affect your vision and appearance. The procedure involves tightening the tendon to lift the eyelid to its normal position, improving both function and aesthetics.

19 services19 patients

Shortening or advancement of upper eyelid muscle to correct drooping or paralysis 67903

This procedure involves adjusting the muscle in your upper eyelid to correct drooping or paralysis. The muscle may be shortened or advanced to help lift the eyelid to a better position. This can improve vision and give a more alert appearance. It's typically an outpatient procedure.

11 services11 patients

Extensive repair of turning-inward eyelid defect 67924

This procedure helps correct an eyelid defect where the eyelid turns inward, causing discomfort or vision issues. A surgeon makes precise adjustments to the eyelid's structure, alleviating the inward turn and improving eye health and comfort.

11 services11 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Aurora Baycare Medical Ctr

Acute Care Hospitals · Green Bay, WI

5/5 CMS rating

OwnershipProprietary

CMS Certification Number520193

Location2845 Greenbrier RdGreen Bay, WI 54311 · Brown County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54303 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$123.69 typical visit price

range $53.90 – $163.24

Typical copayment $30.92 (range $13.47 – $40.81)

Most-billed visit code 99204

Established Patient

$67.37 typical visit price

range $17.40 – $133.76

Typical copayment $16.84 (range $4.35 – $33.44)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

77.33/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

76.22

Promoting Interoperability

100

Improvement Activities

Cost

48.23

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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NICOLE L LOWE APNP

Nurse Practitioner

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 327-7300

BRAD J LAVALLIE OD

Optometrist

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 327-7000

HEIDI KATHRYN BERGMAN PT, DPT

Physical Therapist

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 288-4712

JULIE A MAGNIN M.D.

Family Medicine

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 327-7300

CLINTON B OLSON MD

Family Medicine

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 327-7300

NICHOLAS JAMES HEEZEN D.O.

Internal Medicine

2253 W MASON ST, SUITE 200
GREEN BAY, WI 54303

Brown County (920) 327-7300

DR. MARK R KROLL D.O.

Emergency Medicine

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 327-7000

SHANNA M SEBERO APNP

Nurse Practitioner

2253 W MASON ST
GREEN BAY, WI 54303

Brown County (920) 327-7300

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Duffy's NPI number?

The NPI number for Mark Duffy is 1235167537. It was assigned to this individual provider in the NPPES registry on June 28, 2006.

Where is Mark Duffy located?

Mark Duffy practices at 2253 W Mason St, Green Bay, WI 54303. The listed phone number is (920) 327-7000.

What is Mark Duffy's specialty?

The primary specialty registered for this NPI is Ophthalmology, specializing in Ophthalmic Plastic and Reconstructive Surgery, with taxonomy code 207WX0200X.

Is Mark Duffy enrolled in Medicare?

Yes. Mark Duffy is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Mark Duffy accept?

Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Louisiana, CareSource (Common Ground Healthcare), HealthPartners and Quartz and 2 other insurers list Mark Duffy as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mark Duffy affiliated with any hospitals?

According to CMS data, Mark Duffy is affiliated with Aurora Baycare Medical Ctr.

When was this NPI record last updated?

The NPPES record for Mark Duffy was last updated on April 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.