Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark E. Fenster, M.D.

MOHS-Micrographic Surgery Physician in Dayton, OH · enumerated 2006.

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

National Provider Identifier

1639197049

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Registry record

Entity type Individual (Type 1)

Name Mark E. Fenster

Credential M.D.

Sex Male

Practice address 5300 Far Hills Ave., Dayton, OH, 45429

Phone (937) 433-7536

Fax (937) 433-9612

Enumeration date Jul 17, 2006

Last updated in NPPES Aug 3, 2016

Taxonomy & licenses

207ND0101X MOHS-Micrographic Surgery Physician Allopathic & Osteopathic Physicians · License 35072837F (OH) Primary

207NS0135X Procedural Dermatology Physician Allopathic & Osteopathic Physicians · License 35072837F (OH) Secondary

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
0968011	Other	OH	AETNA
3109647743A20	Other	OH	ANTHEM BLUE SHIELD
0300382	Other	OH	UNITED HEALTH CARE

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

Is NPI 1639197049 active?

Yes, as of the latest NPPES snapshot, NPI 1639197049 is active (record last updated 2016-08-03).

How do I verify Mark Fenster's NPI record?

Cross-check NPI 1639197049 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Hand Surgery Associates Orthopaedic Hand Surgery Physician · Dayton, OH NPI 1982668463 Stephen Levitt Dermatology Physician · Dayton, OH NPI 1891721882 John Lepage Dermatology Physician · Dayton, OH NPI 1871511188 Phillip Hall MOHS-Micrographic Surgery Physician · Dayton, OH NPI 1144248493 Robert Palacio Dermatology Physician · Dayton, OH NPI 1558381806 Dermatologists of Southwestern Ohio, LLC. Dermatology Physician · Dayton, OH NPI 1801819883 Brian Russ Dermatology Physician · Dayton, OH NPI 1437169737 Matthew Bakos Dermatology Physician · Dayton, OH NPI 1861587115

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-03.