NPI age
20 years
Enumerated 2006-05-20
● Active
Type 1 · Individual
Diana R Kerwin, MD
Kerwin is 1 of 46 internal medicine providers in Dallas and 1 of 377 in Texas.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
TX, WI
2 states
Status
Active
No deactivations on record
Last NPPES update
2016-01-13
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 377 active internal medicine providers in Texas.
NPI age
20 years
↑ 2 yr above median (18 yr)
State licenses
2 states
Top 87% — 12% of peers are multi-state
Subspecialties
0
38% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-05Enumerated in NPPES
2006
2026
Where they practice
Practice location
8198 Walnut Hill Ln Ste 100
Dallas, TX 752314316
Mailing address
8198 Walnut Hill Ln Ste 100
Dallas, TX 752314316
Specialties
-
Internal Medicine PrimaryAn internist who has special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (WI) | 34205300 | |
| 01 | 006000261R | HUMANA |
| 05 (TX) | 326041601 |
Multi-state credentialing: Licensed in 2 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 5 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in Dallas in the last 180 days.
See all →
Provyx · Custom healthcare lists
Need all 377 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.