NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

M. F. Diffendall Od PA

Optometrist in Phoenix, MD · enumerated 2012 · authorized official Michael Diffendall, Owner.

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

National Provider Identifier

1194074476

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name M. F. Diffendall Od PA
Other name <Unavail>
Practice address 3332 Paper Mill Rd, Phoenix, MD, 21131
Phone (410) 628-1510
Enumeration date Sep 2, 2012
Last updated in NPPES Nov 14, 2013

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License TA1372 (MD) Primary

Authorized official

Name Michael Diffendall
Title Owner
Phone (410) 628-1510

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

Where is M. F. Diffendall Od PA located?
The practice location on file with NPPES is in Phoenix, MD.
How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2013-11-14. Verify at npiregistry.cms.hhs.gov.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-11-14.