Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

David Steven Blum, O.D.

Optometrist in Baltimore, MD · enumerated 2006.

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

National Provider Identifier

1679520928

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Registry record

Entity type Individual (Type 1)

Name David Steven Blum

Credential O.D.

Sex Male

Practice address Baltimore, MD, 21236

Phone (410) 682-3000

Fax (410) 682-6890

Enumeration date May 30, 2006

Last updated in NPPES May 4, 2021

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License TAO857 (MD) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
XZ72DS	Other	MD	CAREFIRST BCBS
382-00-8400	Medicaid	MD	-
522253219	Other	MD	ADVANTICA

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 David Blum's NPI record?

Cross-check NPI 1679520928 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1679520928 active?

Yes, as of the latest NPPES snapshot, NPI 1679520928 is active (record last updated 2021-05-04).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-04.