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

Dr. Michael H Mark, MD

Neurology Physician in Millsboro, DE · enumerated 2005.

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

National Provider Identifier

1821082892

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael H Mark

Credential MD

Sex Male

Practice address Millsboro, DE, 19966

Phone (302) 933-0111

Fax (302) 933-0990

Enumeration date Sep 7, 2005

Last updated in NPPES Apr 9, 2013

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

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License C1-0003541 (DE) 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
51038312C	Other	-	BLUE SHIELD DE
265039	Other	-	MAMSI
4275007	Other	-	AETNA
D000288	Other	-	TRICARE
KG82	Other	-	MD BLUE SHIELD
C08438	Other	-	MID ATLANTIC
0000245501	Medicaid	DE	-
130018400	Other	-	RAILROAD MEDICARE
G2420004	Other	-	DELMARVA HEALTH PLAN

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

How do I verify Michael Mark's NPI record?

Cross-check NPI 1821082892 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821082892 active?

Yes, as of the latest NPPES snapshot, NPI 1821082892 is active (record last updated 2013-04-09).

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Robert Laduca Chiropractor · Millsboro, DE NPI 1396700696 Beverly Wells Nurse Practitioner · Millsboro, DE NPI 1922155795 Mark Neurology,LLC Neurology Physician · Millsboro, DE NPI 1114192077 Sean Forsyth Family Nurse Practitioner · Millsboro, DE NPI 1598159568 Coastal Chiropractic, LLC Chiropractor · Millsboro, DE NPI 1841725942

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-04-09.