Dr. Mark David Gusack, M.D.

Dr. Mark David Gusack is a Anatomic Pathology & Clinical Pathology Physician provider (Pathology) practicing in Augusta, ME, registered in the NPPES registry with NPI 1912948050 since 2006. The credential MD stands for Doctor of Medicine.

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NPI	1912948050
Entity type	Individual (Type 1)
Name	Dr. Mark David Gusack
Credential	M.D.
Sex	Male
Practice address	1 CENTER ST, Augusta, ME, 04330
Phone	2076238411
Fax	2076217314
Enumeration date	2006-06-09
Last updated in NPPES	2007-07-08

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
207ZP0102X	Anatomic Pathology & Clinical Pathology Physician	Primary	016135	ME
207ZP0102X	Anatomic Pathology & Clinical Pathology Physician	Secondary	162605	NY

MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Copy-ready billing details

Provider: Mark Gusack, M.D.
NPI: 1912948050
Taxonomy: 207ZP0102X (Anatomic Pathology & Clinical Pathology Physician)
Address: 1 CENTER ST, Augusta, ME, 04330

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1801991484	John Bachman	Individual	Medical Physician Assistant	Augusta, ME

Verify this record

Cross-check NPI 1912948050 against the authoritative CMS record: view Dr. Mark David Gusack on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

What specialty is Mark Gusack?

Mark Gusack is registered in NPPES with the primary taxonomy of Anatomic Pathology & Clinical Pathology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.