Physician Profile
Santiago Villarreal, M.D.
Unclaimed ProfileAbout Dr. Villarreal
Santiago Villarreal, M.D. is a healthcare provider in San Antonio, TX specializing in nephrology. Medicare claims data shows Santiago provided 806 services to 247 patients. The services billed most often include subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes, hemodialysis procedure with physician evaluation, and subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes. This provider record is associated with NPI 1225035199.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (210) 647-1195
- Email not available
Practice Locations
4151 CALLAGHAN RD SUITE 103
San Antonio, TX 78228
Conditions Commonly Evaluated or Treated
Within Nephrology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Acid-base disorders
Anatomical conditions
Autoimmune conditions
Blood disorders
Blood pressure
Cysts and growths
Diabetes complications
Dialysis complications
Electrolyte disorders
Fluid retention
Genetic disorders
Hormone disorders
Infections
Inflammatory conditions
Kidney damage
Kidney failure
Kidney filter diseases
Lab abnormalities
Metabolic disorders
Multi-organ conditions
Structural kidney issues
Symptoms
Urine abnormalities
Urine symptoms
Vascular conditions
Vascular kidney issues
Procedures & services
Most searched procedures
Consultations
Diagnostic tests
Diagnostics
Dialysis
Dialysis access
- Dialysis Access Physical Exam
- Dialysis Catheter Removal
- Dialysis Fistula Repair
- Temporary Dialysis Line Placement
Diet and nutrition
Imaging
Infusions
Interventional procedures
Lab tests
- 24-hour urine test
- Comprehensive Metabolic Panel
- Kidney Function Blood Test
- Parathyroid hormone monitoring
- Urine protein check
- Urine sediment test
Medication management
- Active Vitamin D Therapy
- Resistant Blood Pressure Medication Adjustment
- Steroid Therapy For Kidney Inflammation
Medication therapy
- Acid reducer treatment for kidneys
- Phosphate binder therapy
- Potassium lowering treatment
- Red blood cell booster injections
- Water pill adjustment
Patient education
Prevention
Procedures
Specialized therapies
Supportive care
Surgical procedures
Transplant care
Vascular access
Procedures Most Often Billed to Medicare
806 services · 247 patients · 10 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Hemodialysis procedure with physician evaluation | Treatment | 90935 |
144 | More often than most peers in Nephrology |
| Dialysis services, 4 or more physician visits per month (20 years or older) | Treatment | 90960 |
117 | As often as other peers in Nephrology |
| Dialysis services, 2-3 physician visits per month (20 years or older) | Treatment | 90961 |
107 | More often than most peers in Nephrology |
| Dialysis services, 1 physician visit per month (20 years or older) | Treatment | 90962 |
30 | As often as other peers in Nephrology |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
174 | More than most peers in Nephrology |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
122 | As often as other peers in Nephrology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
44 | Less often than most peers in Nephrology |
| Critical care, first 30-74 minutes | Office visit | 99291 |
34 | As often as other peers in Nephrology |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
19 | Less often than most peers in Nephrology |
| Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | Office visit | 99221 |
15 | Less often than most peers in Nephrology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other kidney specialists in San Antonio 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1977 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Hemodialysis procedure with physician evaluation 8
Providers in TX who bill this service to Medicare most often.
Common questions
What does Santiago Villarreal specialize in?
Santiago Villarreal is a kidney specialist in San Antonio, TX. That is the designation recorded for this NPI in the federal registry, where it is listed as “Nephrology”.
NPI registry
Where is Santiago Villarreal located?
Santiago Villarreal is listed at 4151 Callaghan Rd Suite 103, San Antonio, TX 78228. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Santiago Villarreal's phone number?
The number on file is (210) 647-1195. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Santiago Villarreal?
Santiago Villarreal's National Provider Identifier is 1225035199. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Santiago Villarreal train?
Santiago Villarreal attended Other, graduating in 1977. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Santiago Villarreal have?
Santiago Villarreal has 49 years experience. Calculated from a graduation year of 1977, reported in the CMS National Downloadable File.
CMS public data
What does Santiago Villarreal do most often?
According to Medicare billing data, Santiago Villarreal provides treatments such as hemodialysis procedure with physician evaluation and dialysis services, 4 or more physician visits per month, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Santiago Villarreal's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Santiago Villarreal. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.