Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark A Dennis, M.D.

Q: What is the NPI number for Mark Dennis?

The National Provider Identifier (NPI) for Mark Dennis is 1649256561, a Type 1 (individual) record in the CMS NPPES registry.

Diagnostic Radiology Physician in Englewood, CO · enumerated 2005.

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

National Provider Identifier

1649256561

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark A Dennis

Credential M.D.

Sex Male

Practice address 10800 E Geddes Ave Ste 300, Englewood, CO, 80112

Phone (303) 761-9190

Fax (720) 874-4462

Enumeration date Dec 22, 2005

Last updated in NPPES Dec 14, 2022

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 25104 (NE) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 04-36688 (KS) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License MD17507 (HI) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 23198 (CO) 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
10025709000	Medicaid	NE	-
2301381	Medicaid	LA	-
1649256561	Medicaid	WY	-
1649256561	Medicaid	IA	-
200364600	Medicaid	IN	-
23727055	Medicaid	NM	-
01231984	Medicaid	CO	-
42866602	Medicaid	AZ	-
64048556	Medicaid	KY	-
104699390	Medicaid	MI	-
1649256561	Medicaid	MT	-
1649256561	Medicaid	MO	-
200425880A	Medicaid	KS	-
1649256561	Medicaid	CA	-
200638130A	Medicaid	OK	-
0224905	Medicaid	WA	-
200067205	Medicaid	MO	-
208221601	Medicaid	TX	-
84-059792913	Medicaid	NE	-

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 does Mark Dennis practice?

The practice location on file with NPPES is in Englewood, CO. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mark Dennis?

The National Provider Identifier (NPI) for Mark Dennis is 1649256561, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-14.