NPI age
19 years
Enumerated 2007-04-16
● Active Type 2 · Organization
On Call Services Inc
On Call Services Inc is 1 of 2301 internal medicine organizations in Texas.
Primary specialty
Internal Medicine
Practice locations
1
0 secondary on file
Status
Active
No deactivations on record
Authorized official
Blake
President
Last NPPES update
2008-05-19
Source: monthly bulk 2026-05
How this organization compares
Across 2301 active internal medicine providers in Texas.
NPI age
19 years
≈ at median (19 yr)
Practice locations
1
0 secondary on file
Subspecialties
0
NPI lifetime · 2007 → 2026
2007-04Enumerated in NPPES
2007
2026
Where they practice
Primary practice location
2310 N Ed Carey Dr, Suite 1a
Harlingen, TX 785508200
Mailing address
5505 S Expressway 77, Suite 101
Harlingen, TX 785503214
Authorized official
Hugo G Blake, M.D.
President
📞 9564259302
Individual providers at this organization
10 individual providers on file at this primary practice address.
- Peggy Andress, FNP Nurse Practitioner NPI 1730375072
- Rolando Ascarrunz, MD Internal Medicine NPI 1821093246
- Hugo Blake, MD Internal Medicine NPI 1447254024
- Martina Briseno-Lucio, APRN, FNP-C Nurse Practitioner NPI 1861945339
- Michael Evans, MD Internal Medicine NPI 1689678187
- Eduardo Flores, MD Internal Medicine NPI 1528062973
- Juan Garza, MD Internal Medicine NPI 1306841366
- Christopher Lamotte, PA-C Physician Assistant NPI 1275812349
- Frank Mazzola, MD Internal Medicine NPI 1558323915
- David Yardley, MD Internal Medicine NPI 1548253560
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.
Practice context
Multi-provider organization. 10 individual providers on file at this primary address.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
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