NPI age
13 years
Enumerated 2012-06-29
● Active
Type 1 · Individual
DR. Marshall Sack, M.D.
Sack is 1 of 123 internal medicine providers in Houston and 1 of 749 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2012-07-02
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 749 active internal medicine providers in Texas.
NPI age
13 years
↓ 5 yr below median (18 yr)
State licenses
1 state
15% of peers hold multiple states
Subspecialties
1
In the 34% of peers with subspecialties
NPI lifetime · 2012 → 2026
2012-06Enumerated in NPPES
2012
2026
Where they practice
Practice location
3100 Timmons Ln, Suite 250
Houston, TX 770275926
Mailing address
3100 Timmons Ln, Suite 250
Houston, TX 770275926
Specialties
-
Internal Medicine PrimaryAn internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and "collagen" diseases.
-
Internal MedicineA 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,...
Practice context
Part of a multi-provider practice. 14 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in Houston 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.