Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Alan Chastain, MD

Dermatology Physician in Marietta, GA · enumerated 2006 · practices at Aqua Dermatology of Georgia PC.

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

National Provider Identifier

1790756138

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Alan Chastain

Credential MD

Sex Male

Practice address 835 Cogburn Ave Nw, Suite 100, Marietta, GA, 30060

Phone (770) 422-5557

Fax (770) 422-5456

Enumeration date Feb 1, 2006

Last updated in NPPES Jun 12, 2020

Taxonomy & licenses

207ND0101X MOHS-Micrographic Surgery Physician Allopathic & Osteopathic Physicians · License 048995 (GA) Secondary

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 048995 (GA) 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
339883816A	Medicaid	GA	-
P00086676	Other	GA	RAILROAD MEDICARE

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

What is the NPI number for Mark Chastain?

The National Provider Identifier (NPI) for Mark Chastain is 1790756138, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Chastain practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-12.