NPI age
15 years
Enumerated 2011-05-07
● Active
Type 1 · Individual
John Manllo Dieck, M.D.
Manllo Dieck is 1 of 84 internal medicine providers in McAllen and 1 of 12343 in Texas.
Primary specialty
Internal Medicine
Licensed in
MI
1 state
Status
Active
No deactivations on record
Last NPPES update
2022-07-21
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 12343 active internal medicine providers in Texas.
NPI age
15 years
↓ 2 yr below median (17 yr)
State licenses
1 state
12% of peers hold multiple states
Subspecialties
0
33% of peers hold subspecialties
NPI lifetime · 2011 → 2026
2011-05Enumerated in NPPES
2011
2026
Where they practice
Practice location
1901 S 1st St Ste 600
McAllen, TX 785031228
Mailing address
1901 S 1st St Ste 600
McAllen, TX 785031228
Specialties
-
Internal Medicine PrimaryA 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. 8 other active providers share this practice address in NPPES.
Recently enumerated nearby: 1 new internal medicine provider has been added in McAllen in the last 180 days.
See all →
Provyx · Custom healthcare lists
Need all 12343 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.