NPI age
19 years
Enumerated 2006-11-20
● Active
Type 1 · Individual
Katy Lease Lonergan II, M.D.
Lonergan is 1 of 181 internal medicine providers in Dallas and 1 of 2301 in Texas.
Primary specialty
Internal Medicine
Plus 3 subspecialties
Licensed in
TX, CA
2 states
Status
Active
No deactivations on record
Last NPPES update
2012-11-28
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 2301 active internal medicine providers in Texas.
NPI age
19 years
≈ at median (19 yr)
State licenses
2 states
Top 88% — 11% of peers are multi-state
Subspecialties
2
In the 37% of peers with subspecialties
NPI lifetime · 2006 → 2026
2006-11Enumerated in NPPES
2006
2026
Where they practice
Practice location
5323 Harry Hines Blvd
Dallas, TX 753907201
Mailing address
Po Box 845347
Dallas, TX 752845347
Specialties
-
Internal Medicine PrimaryAn internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
-
HospitalistHospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term...
-
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. 4085 other active providers share this practice address in NPPES.
Provyx · Custom healthcare lists
Need all 2301 Internal Medicine providers in Texas?
Get the full list as a CSV with verified work emails, direct phones, and LinkedIn URLs.
Request a quote →How to verify this provider
- 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.