OSCAR ALBERTO IZNAOLA -ESQUIVEL M.D.
NPI 1699968560
Internal Medicine - Nephrology in San Antonio, TX

Q: What is Oscar Iznaola -esquivel's NPI number?

The NPI number for Oscar Iznaola -esquivel is 1699968560. It was assigned to this individual provider in the NPPES registry on August 23, 2007.

Q: What is Oscar Iznaola -esquivel's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Active since August 23, 2007PECOS Enrolled

1141 N LOOP 1604 E, 105-434, SAN ANTONIO, TX 78232(361) 239-2851 Get Directions Write a Review

NPPES record last updated: March 6, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Oscar Alberto Iznaola -esquivel M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

OSCAR ALBERTO IZNAOLA -ESQUIVEL M.D. (NPI 1699968560) is an individual nephrology provider in San Antonio, Texas, licensed in Texas (N2126) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS, is affiliated with Baptist Medical Center, and is a graduate of Other (2000).

NPPES Registry Identity

NPI1699968560

Entity TypeIndividualMale

Primary Taxonomy207RN0300X

Provider Legal NameOSCAR ALBERTO IZNAOLA -ESQUIVELCredential: M.D.

Location Address1141 N LOOP 1604 E, 105-434San Antonio, TX 78232-1339

Mailing Address1141 N Loop 1604 E, 105-434San Antonio, TX 78232-1339 · (361) 239-2851

Phone(361) 239-2851

Sole ProprietorNo

Medical School CMSOtherGraduated 2000

Enumeration DateAugust 23, 2007

Last NPPES UpdateMarch 6, 2020

NPPES CertifiedMarch 6, 2020

✔ NPI 1699968560 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians

Taxonomy Code207RN0300X

License✔ Licensed in TX · N2126

Definition

An 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.

Also ListedInternal Medicine · Geriatric MedicineTaxonomy 207RG0300X · License N2126 (TX)

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License BP30027810 (TX)

1141 N LOOP 1604 E, San Antonio, TX 78232

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Other Identifiers 2

Other760524482Federaltax Id Number

Medicaid207474204TX

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan, WellPoint.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oscar Alberto Iznaola -esquivel M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID1254485089

PECOS Enrollment IDI20090813000461

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Oscar Iznaola -esquivel reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Center For Internal Medicine, PA

8.6 mi

Primary Care

8265 FREDERICKSBURG RD
San Antonio, TX 78229

Reassigned Medicare billing, Texas enrollment
5 clinicians in this Medicare group

NPI 1023206513 (210) 200-8798

Robert G. Szewc, M.D., P.A.

13 mi

Nephrology

915 S LAREDO ST STE 200
San Antonio, TX 78204

Reassigned Medicare billing, Texas enrollment
28 clinicians in this Medicare group

NPI 1366599888 (210) 277-1418

C H Wilkinson Physician Network

19 mi

Nurse Practitioner

1381 S MAIN STREET
Boerne, TX 78006

Reassigned Medicare billing, Texas enrollment
179 clinicians in this Medicare group

NPI 1326292145 (830) 249-9424

Oscar Iznaola M.D,, PA

93 mi

Nephrology

100 W HUNTINGTON ST
Beeville, TX 78102

Reassigned Medicare billing, Texas enrollment
Medicare enrollment name: Oscar Iznaola MD PA

NPI 1649674953 (361) 239-2851

Citizen's Medical Center County Of Victoria

106 mi

Multi-Specialty

2701 HOSPITAL DR
Victoria, TX 77901

Reassigned Medicare billing, Texas enrollment
Medicare enrollment name: Citizens Medical Center County Of Victoria
171 clinicians in this Medicare group

NPI 1205242088 (361) 573-9181

Hospitalist Medicine Physicians Of Texas, PLLC

194 mi

Internal Medicine

18951 N MEMORIAL DR
Humble, TX 77338

Reassigned Medicare billing, Texas enrollment
2,009 clinicians in this Medicare group

NPI 1629307095 (281) 540-7700

Cogent Healthcare Of Texas, PA

247 mi

Internal Medicine

8200 WALNUT HILL LN
Dallas, TX 75231

Reassigned Medicare billing, Texas enrollment
1,208 clinicians in this Medicare group

NPI 1992722953 (214) 345-7585

Victoria Hospitalist Associates, LLC

472 mi

Hospitalist

4500 S GARNETT RD, STE 919
Tulsa, OK 74146

Reassigned Medicare billing, Texas enrollment
100 clinicians in this Medicare group

NPI 1023236825 (918) 728-6145

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

1,005 services97 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

699 services127 patients

Hemodialysis procedure with physician evaluation 90935

Hemodialysis is a treatment that uses a machine to filter waste and excess fluid from your blood when your kidneys can't. A physician checks your health before, during, and after the procedure to ensure it's working effectively for you.

206 services43 patients

Dialysis services, 4 or more physician visits per month (20 years or older) 90960

Dialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.

112 services19 patients

Dialysis services, 2-3 physician visits per month (20 years or older) 90961

Dialysis is a treatment that performs the function of healthy kidneys if they're not working properly. It removes waste and excess fluid from your blood. 2-3 physician visits per month are recommended for monitoring your health and adjusting your treatment as needed. This service is available for those aged 20 years and older.

61 services20 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

54 services47 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Baptist Medical Center

Acute Care Hospitals · San Antonio, TX

4/5 CMS rating

OwnershipProprietary

CMS Certification Number450058

Location111 Dallas StreetSan Antonio, TX 78205 · Bexar County

Emergency services Birthing friendly

University Health System

Acute Care Hospitals · San Antonio, TX

3/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number450213

Location4502 Medical DrSan Antonio, TX 78229 · Bexar County

Emergency services Birthing friendly

Christus Santa Rosa Medical Center

Acute Care Hospitals · San Antonio, TX

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number450237

Location2827 Babcock RoadSan Antonio, TX 78229 · Bexar County

Emergency services Birthing friendly

Methodist Hospital

Acute Care Hospitals · San Antonio, TX

4/5 CMS rating

OwnershipProprietary

CMS Certification Number450388

Location7700 Floyd Curl DrSan Antonio, TX 78229 · Bexar County

Emergency services Birthing friendly

Methodist Hospital Stone Oak

Acute Care Hospitals · San Antonio, TX

4/5 CMS rating

OwnershipProprietary

CMS Certification Number670055

Location1139 E Sonterra Blvd,San Antonio, TX 78258 · Bexar County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78232 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$126.40 typical visit price

range $54.84 – $166.88

Typical copayment $31.60 (range $13.71 – $41.72)

Most-billed visit code 99204

Established Patient

$97.05 typical visit price

range $17.52 – $136.11

Typical copayment $24.26 (range $4.38 – $34.02)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DENISE MORA

Specialist/Technologist, Other (Electroneurodiagnostic)

1141 N LOOP 1604 E, STE 105-612
SAN ANTONIO, TX 78232

Bexar County (210) 598-2800

KHIN NYO

Specialist/Technologist, Other (Electroneurodiagnostic)

1141 N LOOP 1604 E, 105-446
SAN ANTONIO, TX 78232

Bexar County (210) 566-2333

MS. XIXI CHEN

Specialist/Technologist, Other (Electroneurodiagnostic)

1141 N LOOP 1604 E, STE 105-612
SAN ANTONIO, TX 78232

Bexar County (210) 598-4228

MS. MARIBEL GOMEZ CNIM

Specialist/Technologist, Other (Electroneurodiagnostic)

1141 N LOOP 1604 E, STE 105-612
SAN ANTONIO, TX 78232

Bexar County (210) 598-4228

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Oscar Iznaola -esquivel's NPI number?

The NPI number for Oscar Iznaola -esquivel is 1699968560. It was assigned to this individual provider in the NPPES registry on August 23, 2007.

Where is Oscar Iznaola -esquivel located?

Oscar Iznaola -esquivel practices at 1141 N Loop 1604 E 105-434, San Antonio, TX 78232. The listed phone number is (361) 239-2851.

What is Oscar Iznaola -esquivel's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Oscar Iznaola -esquivel enrolled in Medicare?

Yes. Oscar Iznaola -esquivel is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Oscar Iznaola -esquivel's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Oscar Iznaola -esquivel reassigns Medicare benefits to 8 organizations: Center For Internal Medicine, PA (San Antonio, TX), Robert G. Szewc, M.D., P.A. (San Antonio, TX), C H Wilkinson Physician Network (Boerne, TX), Oscar Iznaola M.D,, PA (Beeville, TX), Citizen's Medical Center County Of Victoria (Victoria, TX) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Oscar Iznaola -esquivel's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Oscar Iznaola -esquivel accept?

Health plans from Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan and WellPoint list Oscar Iznaola -esquivel as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Oscar Iznaola -esquivel affiliated with any hospitals?

According to CMS data, Oscar Iznaola -esquivel is affiliated with Baptist Medical Center, University Health System, Christus Santa Rosa Medical Center, Methodist Hospital and Methodist Hospital Stone Oak.

When was this NPI record last updated?

The NPPES record for Oscar Iznaola -esquivel was last updated on March 6, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.