NPI age
19 years
Enumerated 2006-07-07
● Active
Type 1 · Individual
Mark Oltermann, MD
Oltermann is 1 of 24 internal medicine providers in Fort Worth and 1 of 479 in Texas.
Primary specialty
Internal Medicine
Plus 3 subspecialties
Licensed in
TX, NV, MT
3 states
Status
Active
No deactivations on record
Last NPPES update
2021-06-15
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 479 active internal medicine providers in Texas.
NPI age
19 years
↑ 3 yr above median (16 yr)
State licenses
3 states
Top 67% — 32% of peers are multi-state
Subspecialties
2
In the 79% of peers with subspecialties
NPI lifetime · 2006 → 2026
2006-07Enumerated in NPPES
2006
2026
Where they practice
Practice location
1500 S Main St
Fort Worth, TX 76104
Mailing address
1617 Hemphill St, Attn Credentialing
Fort Worth, TX 761044709
Additional practice locations
1 secondary location on file with NPPES.
Location 2
1155 Mill St
Reno, NV 895021576
Specialties
-
Internal Medicine PrimaryAn internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the...
-
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,...
-
Internal MedicineAn internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 150942401 | |
| 05 (OK) | 200003780A | |
| 05 (NM) | 59339837 |
Multi-state credentialing: Licensed in 3 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 958 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.