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DR. PATRICK T DUNLAY DO
NPI 1811004294
Internal Medicine in Mason City, IA

Active since August 23, 2006PECOS Enrolled
1000 4TH ST SW, SUITE IM, MASON CITY, IA 50401(641) 422-6999(641) 422-6678 Get Directions Write a Review

NPPES record last updated: April 1, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 1, 2025, Aug 16, 2022, Aug 11, 2022 and 2 more (5 updates tracked since 2020).

About Dr. Patrick T Dunlay Do NPPES

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

DR. PATRICK T DUNLAY DO (NPI 1811004294) is an individual internal medicine provider in Mason City, Iowa, licensed in Iowa (02413) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1811004294
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. PATRICK T DUNLAYCredential: DO
Location Address1000 4TH ST SW, SUITE IMMason City, IA 50401-2800
Mailing Address621 S Illinois Ave, Suite 103Mason City, IA 50401-5489 · (641) 494-3041 · Fax (641) 494-3059
Phone(641) 422-6999
Fax(641) 422-6678
Sole ProprietorNo
Enumeration DateAugust 23, 2006
Last NPPES UpdateApril 1, 20255 updates tracked since enumeration
NPPES CertifiedApril 1, 2025
✔ NPI 1811004294 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in IA · 02413
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
1000 4TH ST SW, Mason City, IA 50401
Open in Google Maps ↗

Other Identifiers 2

Other47725IA · Wellmark
Medicaid1001198IA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Patrick T Dunlay Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignment

Medicare enrollment records show Patrick Dunlay reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

North Iowa Mercy Clinics
Same address
Nurse Practitioner
1000 4TH ST SW
Mason City, IA 50401
  • Reassigned Medicare billing, Iowa enrollment
  • 420 clinicians in this Medicare group
NPI 1043321102 (641) 428-5932

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

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.

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.
621 services266 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
468 services407 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
176 services176 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.
13 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 50401 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
$122.23 typical visit price
range $52.96 – $161.40
Typical copayment $30.55 (range $13.24 – $40.35)
Most-billed visit code 99204
Established Patient
$94.05 typical visit price
range $16.91 – $131.98
Typical copayment $23.51 (range $4.22 – $32.99)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
17 suppliers90 claims153 services$5.91 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
10 suppliers25 claims34 services$0.96 avg. paid by Medicare
Albuterol, up to 2.5 mg and ipratropium bromide, up to 0.5 mg, fda-approved final product, non-compounded, administered through dme J7620
DME-Drugs Administered Through DME · category DG006N
1 supplier12 claims720 services$0.10 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

LINDA S VOLD LISW
Social Worker (Clinical)
1000 4TH ST SW, SUITE BS
MASON CITY, IA 50401
Cerro Gordo County (641) 422-7797
BURT HUMBURG MD
Internal Medicine
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-7000
SUMATHY NAGRAJ IYENGAR M.D.,
Hospitalist
1000 4TH ST SW, MERCY MEDICAL CENTER-HOSPITALIST DEPT
MASON CITY, IA 50401
Cerro Gordo County (641) 428-7000
DR. SATINDERJIT SINGH M.D.
Emergency Medicine
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-7234
ASHLEY MATERN ARNP
Nurse Practitioner (Family)
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-6999
ROBERT D. FROEHNER CRNA
Nurse Anesthetist, Certified Registered
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 422-7000
DR. THOMAS P DELANEY MD
Hospitalist
1000 4TH ST SW, SUITE HOSP
MASON CITY, IA 50401
Cerro Gordo County (641) 422-7000
NORTH IOWA MERCY CLINICS
Nurse Practitioner
1000 4TH ST SW
MASON CITY, IA 50401
Cerro Gordo County (641) 428-5932

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 Patrick Dunlay's NPI number?

The NPI number for Patrick Dunlay is 1811004294. It was assigned to this individual provider in the NPPES registry on August 23, 2006.

Where is Patrick Dunlay located?

Patrick Dunlay practices at 1000 4th St SW Suite Im, Mason City, IA 50401. The listed phone number is (641) 422-6999.

What is Patrick Dunlay's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Patrick Dunlay enrolled in Medicare?

Yes. Patrick Dunlay is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Patrick Dunlay's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Patrick Dunlay reassigns Medicare benefits to North Iowa Mercy Clinics (Mason City, IA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Patrick Dunlay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Patrick Dunlay was last updated on April 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.