Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Robert John Cak, MD

Surgery Physician in Waterloo, IA · enumerated 2006.

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

National Provider Identifier

1609829688

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Registry record

Entity type Individual (Type 1)

Name Robert John Cak

Credential MD

Sex Male

Practice address 1753 W Ridgeway Ave, Ste 107, Waterloo, IA, 50701

Phone (319) 833-5907

Fax (319) 833-5908

Enumeration date May 18, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 21323 (IA) 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
19685	Other	IA	WELLMARK INS PLAN
2151605	Medicaid	IA	-
42141730704	Other	IA	JOHN DEERE HEALTH INS PLA

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 Robert Cak's NPI record?

Cross-check NPI 1609829688 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1609829688 active?

Yes, as of the latest NPPES snapshot, NPI 1609829688 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.