NPI age
6 years
Enumerated 2019-06-17
● Active
Type 1 · Individual
Marckenley Isaac, MD
Isaac is 1 of 159 internal medicine providers in Marietta and 1 of 5027 in Georgia.
Primary specialty
Internal Medicine
Plus 3 subspecialties
Licensed in
PA, NY, GA
3 states
Status
Active
No deactivations on record
Last NPPES update
2025-08-26
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 5027 active internal medicine providers in Georgia.
NPI age
6 years
↓ 12 yr below median (18 yr)
State licenses
3 states
Top 89% — 10% of peers are multi-state
Subspecialties
2
In the 32% of peers with subspecialties
NPI lifetime · 2019 → 2026
2019-06Enumerated in NPPES
2019
2026
Where they practice
Practice location
2540 Windy Hill Rd Se
Marietta, GA 300678605
Mailing address
2540 Windy Hill Rd Se
Marietta, GA 300678605
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
245 N. 15th St., 6th Floor, MS 427
Philadelphia, PA 19102
Location 3
374 Stockholm St
Brooklyn, NY 112374006
Specialties
-
Internal Medicine PrimaryA physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer,...
-
AnesthesiologyAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk...
-
AnesthesiologyAn anesthesiologist who provides a high level of care, either as a primary physician or consultant, for patients experiencing problems with acute, chronic and/or cancer pain in both hospital and ambulatory settings. Patient care needs...
Practice context
Part of a multi-provider practice. 84 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in Marietta in the last 180 days.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.