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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joseph Benson Harlan, M.D.

Ophthalmology Physician in Lutherville, MD · enumerated 2006.

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

National Provider Identifier

1861442709

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Registry record

Entity type Individual (Type 1)
Name Joseph Benson Harlan
Credential M.D.
Sex Male
Practice address 1209 York Rd, Suite 200, Lutherville, MD, 21093
Phone (410) 821-9490
Fax (410) 821-9495
Enumeration date May 11, 2006
Last updated in NPPES Apr 11, 2012

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License D53191 (MD) Primary
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
CC3778 Other MD R/R MEDICARE GROUP #
400804900 Medicaid MD -
180042054 Other MD R/R MEDICARE PROVIDER #

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.

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Frequently asked questions

Is NPI 1861442709 active?
Yes, as of the latest NPPES snapshot, NPI 1861442709 is active (record last updated 2012-04-11).
How do I verify Joseph Harlan's NPI record?
Cross-check NPI 1861442709 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-11.