Michael E Ray, MD PHD

Michael E Ray is a Radiation Oncology Physician provider (Radiology) practicing in Appleton, WI, registered in the NPPES registry with NPI 1891888269 since 2006.

✓ Active NPI ✓ Valid NPI checksum

NPI	1891888269
Entity type	Individual (Type 1)
Name	Michael E Ray
Credential	MD PHD
Sex	Male
Practice address	900 E GRANT, Appleton, WI, 54911
Phone	9207386340
Fax	9207386435
Enumeration date	2006-09-30
Last updated in NPPES	2008-05-01

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
2085R0001X	Radiation Oncology Physician	Primary	4301073755	MI

Other identifiers

Identifier	Type	State	Issuer
4537599	Medicaid	MI	—

Copy-ready billing details

Provider: Michael Ray, MD PHD
NPI: 1891888269
Taxonomy: 2085R0001X (Radiation Oncology Physician)
Address: 900 E GRANT, Appleton, WI, 54911

Verify this record

Cross-check NPI 1891888269 against the authoritative CMS record: view Michael E Ray 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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Michael Ray?

Michael Ray is registered in NPPES with the primary taxonomy of Radiation Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2008-05-01.