Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Douglas Mark Duven, MD
Surgery Physician in Waterloo, IA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1861445223
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Registry record
Entity type Individual (Type 1)
Name Douglas Mark Duven
Credential MD
Sex Male
Practice address 1731 W Ridgeway Ave, Ste 100, Waterloo, IA, 50701
Phone (319) 833-6100
Fax (319) 833-6102
Enumeration date May 18, 2006
Last updated in NPPES Oct 9, 2007
Taxonomy & licenses
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 |
|---|---|---|---|
| 42141730701 | Other | IA | JOHN DEERE HEALTH CARE |
| 1203869 | Medicaid | IA | - |
| 19288 | Other | IA | WELLMARK INS 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.
Frequently asked questions
Is NPI 1861445223 active?
Yes, as of the latest NPPES snapshot, NPI 1861445223 is active (record last updated 2007-10-09).
How do I verify Douglas Duven's NPI record?
Cross-check NPI 1861445223 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-09.