NPI age
19 years
Enumerated 2006-10-13
● Active
Type 1 · Individual
Sean O'Mahony, MD
O'Mahony is 1 of 7 internal medicine providers in Galveston and 1 of 217 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX, IL
2 states
Status
Active
No deactivations on record
Last NPPES update
2025-09-05
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 217 active internal medicine providers in Texas.
NPI age
19 years
↑ 7 yr above median (12 yr)
State licenses
2 states
Top 82% — 17% of peers are multi-state
Subspecialties
1
In the 60% of peers with subspecialties
NPI lifetime · 2006 → 2026
2006-10Enumerated in NPPES
2006
2026
Where they practice
Practice location
1005 Harborside Dr, Fl 6
Galveston, TX 775550001
Mailing address
1725 W Harrison St Ste 10
Chicago, IL 606123849
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
1725 W Harrison St Ste 10
Chicago, IL 606123849
Location 3
Mmc-Palliative Care Servc, 3335 Steuben Ave
Bronx, NY 10467
Specialties
-
Internal Medicine PrimaryAn internal medicine physician with special knowledge and skills to prevent and relieve the suffering experienced by patients with life-limiting illnesses. This specialist works with an interdisciplinary hospice or palliative care team...
-
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. 33 other active providers share this practice address in NPPES.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
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