Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Matthew Krewer, OD
Optometrist in Waterloo, IA · enumerated 2016.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1003269721
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Registry record
Entity type Individual (Type 1)
Name Matthew Krewer
Credential OD
Sex Male
Practice address 909 E San Marnan Dr, Waterloo, IA, 50702
Phone (319) 233-2020
Enumeration date Jul 18, 2016
Last updated in NPPES Jan 31, 2023
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
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 1003269721 active?
Yes, as of the latest NPPES snapshot, NPI 1003269721 is active (record last updated 2023-01-31).
How do I verify Matthew Krewer's NPI record?
Cross-check NPI 1003269721 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
Browse all → Suzanne Smith Optometrist · Waterloo, IA NPI 1740234376 Cedar Valley Medical Specialists PC Durable Medical Equipment & Medical Supplies · Waterloo, IA NPI 1568417293 Thomas Petrie Ophthalmology Physician · Waterloo, IA NPI 1497075642 Staci Boon Optometrist · Waterloo, IA NPI 1013261510 Lucas Cook Optometrist · Waterloo, IA NPI 1639582901 Northeast Iowa Optical, LLC Ophthalmology Physician · Waterloo, IA NPI 1083548853 Northeast Iowa Eye, Pllc Ophthalmology Physician · Waterloo, IA NPI 1598699373
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-01-31.