Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael G. Hartman, M.D.

Neurological Surgery Physician in Johns Creek, GA · enumerated 2005 · practices at Georgia Brain & Spine Center.

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

National Provider Identifier

1659377620

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael G. Hartman

Credential M.D.

Sex Male

Practice address 9635 Ventana Way Ste 201, Johns Creek, GA, 30022

Phone (404) 446-4424

Fax (404) 446-4420

Enumeration date Jun 24, 2005

Last updated in NPPES Dec 19, 2019

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 033350 (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
000436015A	Medicaid	GA	-

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 specialty is Michael Hartman?

Michael Hartman is registered in NPPES with the primary taxonomy of Neurological Surgery 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.

Other providers at this practice address

Browse all →

Elias Dagnew Neurological Surgery Physician · Johns Creek, GA NPI 1962408930 Georgia Brain & Spine Center Neurological Surgery Physician · Johns Creek, GA NPI 1871723684

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-12-19.