Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thomas A Castillo, DO

Ophthalmology Physician in Beaver Dam, WI · enumerated 2006.

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

National Provider Identifier

1700805454

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Registry record

Entity type Individual (Type 1)

Name Thomas A Castillo

Credential DO

Sex Male

Practice address 240 Corporate Drive, Beaver Dam, WI, 53916

Phone (920) 887-1151

Fax (920) 887-3353

Enumeration date Jul 19, 2006

Last updated in NPPES May 1, 2024

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 40496 (WI) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
391156156	Other	-	TAX ID
180034885	Other	WI	RAIL ROAD MEDICARE
31662	Other	-	NETWORK HEALTH PLAN
30088300	Medicaid	WI	-
11995	Other	-	DEAN CARE HMO
1024501	Other	-	PHYSICIANS PLUS HMO
39115615613	Other	-	UNITY HMO
WI0113	Other	-	JOHN DEERE HEALTH PLAN

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.

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Frequently asked questions

How do I verify Thomas Castillo's NPI record?

Cross-check NPI 1700805454 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1700805454 active?

Yes, as of the latest NPPES snapshot, NPI 1700805454 is active (record last updated 2024-05-01).

Other providers at this practice address

Browse all →

Erik Schoff Ophthalmology Physician · Beaver Dam, WI NPI 1134101520 Jay Wilkins Ophthalmology Physician · Beaver Dam, WI NPI 1932125093 Vita Park Eye Associates, Sc Ophthalmology Physician · Beaver Dam, WI NPI 1447276894 Vita Park Eye Associates, Sc Ophthalmology Physician · Beaver Dam, WI NPI 1154418051 Charles Hendrix Optometrist · Beaver Dam, WI NPI 1588747547 Cory Springstroh Optometrist · Beaver Dam, WI NPI 1639481534

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-01.