Mr. Matthew S. Bay, P.A.
Mr. Matthew S. Bay is a Surgical Physician Assistant provider (Physician Assistant) practicing in Appleton, WI, registered in the NPPES registry with NPI 1033359401 since 2009. The credential PA stands for Physician Assistant. Practices at Fox Valley Surgical Associates Ltd (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1033359401 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Mr. Matthew S. Bay |
| Credential | P.A. |
| Sex | Male |
| Practice address | 2000 E MILESTONE DR, Appleton, WI, 54913 |
| Phone | 9207318131 |
| Fax | 9208320444 |
| Enumeration date | 2009-02-25 |
| Last updated in NPPES | 2026-01-05 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 363AS0400X | Surgical Physician Assistant | Primary | 2387-23 | WI |
PA — Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential
Copy-ready billing details
Provider: Matthew Bay, P.A. NPI: 1033359401 Taxonomy: 363AS0400X (Surgical Physician Assistant) Address: 2000 E MILESTONE DR, Appleton, WI, 54913
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1659363802 | Dean Sutton | Individual | Nurse Practitioner | Appleton, WI |
| 1285626465 | Charles Cheng | Individual | Surgery Physician | Appleton, WI |
| 1902898182 | Robert Ballard | Individual | Vascular Surgery Physician | Appleton, WI |
| 1528053758 | Christopher Wagner | Individual | Surgery Physician | Appleton, WI |
| 1720036387 | Michael Black | Individual | Surgery Physician | Appleton, WI |
| 1376594952 | Fox Valley Surgical Associates Ltd | Organization | Surgery Physician | Appleton, WI |
| 1356378731 | Christine Arendt | Individual | Nurse Practitioner | Appleton, WI |
| 1912155250 | Eric Stanelle | Individual | Surgery Physician | Appleton, WI |
Verify this record
Cross-check NPI 1033359401 against the authoritative CMS record: view Mr. Matthew S. Bay on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2026-01-05.