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SANTIAGO VILLARREAL M.D.
NPI 1225035199
Internal Medicine - Nephrology in San Antonio, TX

Active since July 07, 2005PECOS EnrolledAccepts Medicare Assignment
4151 CALLAGHAN RD, SUITE 103, SAN ANTONIO, TX 78228(210) 647-1195(210) 521-9473 Get Directions Write a Review

NPPES record last updated: October 6, 2023. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Santiago Villarreal M.d. NPPES

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

SANTIAGO VILLARREAL M.D. (NPI 1225035199) is an individual nephrology provider in San Antonio, Texas, licensed in Texas (TX8995) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, is affiliated with Baptist Medical Center, and is a graduate of Other (1977).

NPPES Registry Identity

NPI1225035199
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameSANTIAGO VILLARREALCredential: M.D.
Location Address4151 CALLAGHAN RD, SUITE 103San Antonio, TX 78228-3419
Mailing Address4151 Callaghan Rd, Suite 103San Antonio, TX 78228-3419 · (210) 647-1195 · Fax (210) 521-9473
Phone(210) 647-1195
Fax(210) 521-9473
Sole ProprietorYes
Medical School CMSOtherGraduated 1977
Enumeration DateJuly 7, 2005
Last NPPES UpdateOctober 6, 2023
NPPES CertifiedOctober 6, 2023
✔ NPI 1225035199 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in TX · TX8995
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.
4151 CALLAGHAN RD, San Antonio, TX 78228
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Santiago Villarreal M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5890707152
PECOS Enrollment IDI20080417000298
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.

Areas of Expertise CMS Part B claims 10

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 straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
174 services44 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.
144 services21 patients
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.
122 services32 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.
117 services30 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.
107 services31 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
44 services27 patients

Hospital Affiliations CMS Care Compare 3

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

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

Frio Regional Hospital

Critical Access Hospitals · Pearsall, TX
OwnershipVoluntary non-profit - Private
CMS Certification Number451391
Location200 S Ih 35Pearsall, TX 78061 · Frio County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78228 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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Diabetes: Medical Attention for Nephropathy
The percentage of patients 18-75 years of age with diabetes who had a nephropathy screening test or evidence of nephropathy during the measurement period
86%49 patients4/55-star benchmark: 99%
Documentation of Current Medications in the Medical Record
Percentage of visits for patients aged 18 years and older for which the eligible professional or eligible clinician attests to documenting a list of current medications using all immediate resources available on the date of the encounter.
95%188 patients4/55-star benchmark: 100%
Patient-Specific Education
The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.
42%267 patients2/55-star benchmark: 99%
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
Percentage of patients aged 18 years and older with a BMI documented during the current encounter or during the previous twelve months AND with a BMI outside of normal parameters, a follow-up plan is documented during the encounter or during the previous…
20%110 patients1/55-star benchmark: 97%
Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention
Percentage of patients aged 18 years and older who were screened for tobacco use one or more times within 24 months AND who received tobacco cessation intervention if identified as a tobacco user
Patients tobacco: 100% · 47 patients
79%47 patients
Provide Patient Access
At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…
42%267 patients2/55-star benchmark: 100%
Secure Messaging
For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure…
0%267 patients1/55-star benchmark: 59%
Use of High-Risk Medications in the Elderly
Percentage of patients 65 years of age and older who were ordered high-risk medications. Two rates are submitted. 1) Percentage of patients who were ordered at least one high-risk medication.
Lower rates are better for this measure.
Patients 2+: 0% · 63 patients
0%63 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 5

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Cyclosporine, oral, 100 mg J7502
Treatment-Treatment - Miscellaneous · category RX029N
1 supplier12 claims720 services$1.67 avg. paid by Medicare
Tacrolimus, immediate release, oral, 1 mg J7507
Treatment-Treatment - Miscellaneous · category RX029N
3 suppliers22 claims2,250 services$0.31 avg. paid by Medicare
Mycophenolate mofetil, oral, 250 mg J7517
Treatment-Treatment - Miscellaneous · category RX029N
3 suppliers23 claims3,360 services$0.18 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511
Treatment-Chemotherapy · category RH012N
3 suppliers35 claims35 services$17.87 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512
Treatment-Chemotherapy · category RH012N
3 suppliers22 claims22 services$11.49 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 5

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

DR. MARIO R JUAREZ M.D.
Family Medicine
4151 CALLAGHAN RD, 102
SAN ANTONIO, TX 78228
Bexar County (210) 681-6380
ERIKA HESS PA-C
Physician Assistant
4151 CALLAGHAN RD, SUITE 102
SAN ANTONIO, TX 78228
Bexar County (210) 681-6389
ROBERT ALMAGUER DDS PLLC
Dentist (General Practice)
4151 CALLAGHAN RD, SUITE 105
SAN ANTONIO, TX 78228
Bexar County (210) 521-0444
JUAREZ & JUAREZ FAMILY MEDICAL CLINIC, INC.
Family Medicine
4151 CALLAGHAN RD, STE 102
SAN ANTONIO, TX 78228
Bexar County (210) 681-6380
DR. ROBERT LEAL ALMAGUER D.D.S.
Dentist (General Practice)
4151 CALLAGHAN RD, #105
SAN ANTONIO, TX 78228
Bexar County (210) 521-0444

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 Santiago Villarreal's NPI number?

The NPI number for Santiago Villarreal is 1225035199. It was assigned to this individual provider in the NPPES registry on July 7, 2005.

Where is Santiago Villarreal located?

Santiago Villarreal practices at 4151 Callaghan Rd Suite 103, San Antonio, TX 78228. The listed phone number is (210) 647-1195.

What is Santiago Villarreal's specialty?

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

Is Santiago Villarreal enrolled in Medicare?

Yes. Santiago Villarreal is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Santiago Villarreal accept?

Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 3 other insurers list Santiago Villarreal 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 Santiago Villarreal affiliated with any hospitals?

According to CMS data, Santiago Villarreal is affiliated with Baptist Medical Center, Methodist Hospital and Frio Regional Hospital.

When was this NPI record last updated?

The NPPES record for Santiago Villarreal was last updated on October 6, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.