Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Benjamin L Mason, M.D..

Ophthalmology Physician in Waterloo, IA · enumerated 2006 · practices at Iowa Eyecare Associates PC.

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

National Provider Identifier

1457301442

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Registry record

Entity type Individual (Type 1)

Name Benjamin L Mason

Credential M.D..

Sex Male

Practice address 999 Home Plz, Waterloo, IA, 50701

Phone (319) 287-5890

Fax (319) 287-5079

Enumeration date May 11, 2006

Last updated in NPPES Feb 15, 2018

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 36579 (IA) Primary

207WX0009X Glaucoma Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 36579 (IA) Secondary

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
P00397399	Other	IA	RAILROAD MEDICARE
3497792	Medicaid	IA	-

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

How do I verify Benjamin Mason's NPI record?

Cross-check NPI 1457301442 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1457301442 active?

Yes, as of the latest NPPES snapshot, NPI 1457301442 is active (record last updated 2018-02-15).

Other providers at this practice address

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Iowa Eyecare Associates PC Optometrist · Waterloo, IA NPI 1619937133 Steven Boeke Optometrist · Waterloo, IA NPI 1770544736 Jerry Stahl Optometrist · Waterloo, IA NPI 1942309893 Dennis Tieszen Optometrist · Waterloo, IA NPI 1952452831

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-02-15.