NPI age
19 years
Enumerated 2007-04-19
● Active
Type 1 · Individual
DR. William Stephen Lefler JR., MD
Lefler is 1 of 6 internal medicine providers in Twin Falls and 1 of 46 in Idaho.
Primary specialty
Internal Medicine
Plus 1 subspecialty
Licensed in
ID, NV
2 states
Status
Active
No deactivations on record
Last NPPES update
2022-12-01
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 46 active internal medicine providers in Idaho.
NPI age
19 years
≈ at median (19 yr)
State licenses
2 states
Top 71% — 28% of peers are multi-state
Subspecialties
0
37% of peers hold subspecialties
NPI lifetime · 2007 → 2026
2007-04Enumerated in NPPES
2007
2026
Where they practice
Practice location
746 N College Rd Ste A
Twin Falls, ID 833013486
Mailing address
190 E Bannock St
Boise, ID 837126241
Additional practice locations
1 secondary location on file with NPPES.
Location 2
1600 Specht Point Rd Ste 127
Fort Collins, CO 805254311
Specialties
-
Internal Medicine PrimaryAn internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (NV) | 1023235058 |
Multi-state credentialing: Licensed in 2 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 4 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 →
- 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.