Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MR. MATTHEW S. BAY P.A.
NPI 1033359401
Physician Assistant in Oshkosh, WI

Q: What is Matthew Bay's NPI number?

The NPI number for Matthew Bay is 1033359401. It was assigned to this individual provider in the NPPES registry on February 25, 2009.

Q: What is Matthew Bay's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Q: When was this NPI record last updated?

The NPPES record for Matthew Bay was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 days 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 February 25, 2009PECOS EnrolledAccepts Medicare Assignment

855 N WESTHAVEN DR, OSHKOSH, WI 54904(920) 303-8700(920) 456-5901 Get Directions Write a Review

NPPES record last updated: August 4, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Aug 4, 2026, Jan 5, 2026 (2 updates tracked since 2026).

On this page

About Mr. Matthew S. Bay P.a. NPPES

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

MR. MATTHEW S. BAY P.A. (NPI 1033359401) is an individual physician assistant in Oshkosh, Wisconsin, licensed in Wisconsin (2387) and active in the NPI registry since February 2009. He is enrolled in Medicare PECOS, is affiliated with Thedacare Regional Medical Center - Appleton Inc, and maintains a secondary practice location in Appleton.

NPPES Registry Identity

NPI1033359401

Entity TypeIndividualMale

Primary Taxonomy363A00000X

Provider Legal NameMR. MATTHEW S. BAYCredential: P.A.

Location Address855 N WESTHAVEN DROshkosh, WI 54904-7668

Mailing AddressPo Box 735044Chicago, IL 60673-5044 · (800) 326-2250

Phone(920) 303-8700

Fax(920) 456-5901

Sole ProprietorNo

Medical School CMSUniversity Of Nebraska College Of MedicineGraduated 2009

Enumeration DateFebruary 25, 2009

Last NPPES UpdateAugust 4, 20262 updates tracked since enumeration

NPPES CertifiedAugust 4, 2026

✔ NPI 1033359401 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363A00000X

License✔ Licensed in WI · 2387

Definition

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Also ListedPhysician Assistant · SurgicalTaxonomy 363AS0400X · License 2387-23 (WI)

855 N WESTHAVEN DR, Oshkosh, WI 54904

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Secondary Practice Location 1

Location 12000 E Milestone DrAppleton, WI 54913-6701 · Phone (920) 731-8131 · Fax (920) 832-0444

Other Identifiers 1

Medicaid100004237WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Aspirus Health Plan, 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

Mr. Matthew S. Bay P.a. 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 ID9739237108

PECOS Enrollment IDI20090423000655

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.

Hospital Affiliations CMS Care Compare

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

Thedacare Regional Medical Center - Appleton Inc

Acute Care Hospitals · Appleton, WI

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520160

Location1818 N Meade StAppleton, WI 54911 · Outagamie County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54904 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

$82.92 typical visit price

range $53.90 – $163.24

Typical copayment $20.73 (range $13.47 – $40.81)

Most-billed visit code 99203

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.

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.

JACQUELINE ANN OTS PENDING

Nurse Practitioner