Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John A Feilbach, M.D.

Internal Medicine Physician in Grafton, WI · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1538191168

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name John A Feilbach

Credential M.D.

Sex Male

Practice address 215 Washington St, Grafton, WI, 53024

Phone (262) 375-3700

Fax (262) 376-6020

Enumeration date Jul 6, 2006

Last updated in NPPES Dec 1, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 33495 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
P00602496	Other	WI	RR MEDICARE
31871700	Medicaid	WI	-

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 → Validate an NPI →

Frequently asked questions

What is the NPI number for John Feilbach?

The National Provider Identifier (NPI) for John Feilbach is 1538191168, a Type 1 (individual) record in the CMS NPPES registry.

Where does John Feilbach practice?

The practice location on file with NPPES is in Grafton, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-01.