ROBERT A ZAJAC MD
NPI 1013907963
Internal Medicine - Infectious Disease in San Antonio, TX

Q: What is Robert Zajac's NPI number?

The NPI number for Robert Zajac is 1013907963. It was assigned to this individual provider in the NPPES registry on October 24, 2005.

Q: What is Robert Zajac's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Q: When was this NPI record last updated?

The NPPES record for Robert Zajac was last updated on August 8, 2024. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since October 24, 2005PECOS EnrolledAccepts Medicare Assignment

83.9/100

CMS Quality Rating

150 E SONTERRA BLVD, SUITE 170, SAN ANTONIO, TX 78258(210) 481-2800(210) 481-2834 Get Directions Write a Review

NPPES record last updated: August 8, 2024. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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About Robert A Zajac Md NPPES

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

ROBERT A ZAJAC MD (NPI 1013907963) is an individual infectious disease provider in San Antonio, Texas, licensed in Texas (H3973) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Peterson Regional Medical Center, and is a graduate of Louisiana State University School Of Medicine In New Orleans (1981).

NPPES Registry Identity

NPI1013907963

Entity TypeIndividualMale

Primary Taxonomy207RI0200X

Provider Legal NameROBERT A ZAJACCredential: MD

Location Address150 E SONTERRA BLVD, SUITE 170San Antonio, TX 78258-4098

Mailing AddressPo Box 1346San Antonio, TX 78295-1346 · (210) 558-6288 · Fax (210) 558-6289

Phone(210) 481-2800

Fax(210) 481-2834

Sole ProprietorNo

Medical School CMSLouisiana State University School Of Medicine In New OrleansGraduated 1981

Enumeration DateOctober 24, 2005

Last NPPES UpdateAugust 8, 2024

NPPES CertifiedAugust 8, 2024

✔ NPI 1013907963 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RI0200X

License✔ Licensed in TX · H3973

Definition

An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.

150 E SONTERRA BLVD, San Antonio, TX 78258

Open in Google Maps ↗

Other Identifiers 1

Medicaid131416308TX

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

Robert A Zajac Md 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 ID6103829726

PECOS Enrollment IDI20060821000053

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 13

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.

Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg J1561

This is an injection of immune globulin, specifically Gamunex-C or Gammaked. It's a liquid form, not freeze-dried. Immune globulin is a blood product that helps your immune system to fight infections. It's given in a dose of 500 mg.

2,110 services13 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.

471 services226 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.

384 services175 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.

226 services224 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.

111 services78 patients

Infusion into a vein for therapy, prevention, or diagnosis, each additional hour 96366

This procedure involves delivering medication, fluids, or nutrients directly into your vein. This is done to treat, prevent, or diagnose various conditions. Each additional hour refers to the extended time you may need to receive these substances for optimal results.

97 services18 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

60 services47 patients

Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and G0180

This is a service where a doctor or authorized practitioner certifies that you require Medicare-covered home health services. They will communicate with the home health agency and review reports on your health status to ensure you receive appropriate care. This does not involve an in-person visit.

37 services34 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

36 services31 patients

Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less 96365

This is a procedure where a medical professional inserts a small tube into your vein to deliver medication, nutrients, or fluids directly into your bloodstream. This can be for treatment, prevention, or diagnosis. The process typically takes less than an hour.

32 services18 patients

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.

30 services25 patients

Physician or allowed practitioner supervision of a patient receiving medicare-covered services provided by a participating home health agency (patient not present) requiring complex and multidisciplinary care modalities involving regular physician or allow G0181

This service involves a physician overseeing your care while you receive Medicare-covered services from a home health agency. The care you're receiving is complex and involves various disciplines. The physician isn't physically present but regularly supervises your treatment to ensure optimal health outcomes.

16 services14 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

12 services12 patients

Hospital Affiliations CMS Care Compare 5

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

Peterson Regional Medical Center

Acute Care Hospitals · Kerrville, TX

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450007

Location551 Hill Country DriveKerrville, TX 78028 · Kerr County

Emergency services Birthing friendly

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

Val Verde Regional Medical Center

Acute Care Hospitals · Del Rio, TX

OwnershipGovernment - Hospital District or Authority

CMS Certification Number450154

Location801 Bedell AveDel Rio, TX 78840 · Val Verde County

Emergency services

Medina Regional Hospital

Critical Access Hospitals · Hondo, TX

OwnershipGovernment - Hospital District or Authority

CMS Certification Number451330

Location3100 Avenue EHondo, TX 78861 · Medina County

Emergency services

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 78258 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.

83.9/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

92.73

Improvement Activities

Cost

39.37

Reported Quality Measures

Breast Cancer Screening

Percentage of women 50-74 years of age who had a mammogram to screen for breast cancer

4%402 patients1/55-star benchmark: 92%

Cervical Cancer Screening

Percentage of women 21-64 years of age who were screened for cervical cancer using either of the following criteria: - Women age 21-64 who had cervical cytology performed every 3 years - Women age 30-64 who had cervical cytology/human papillomavirus (HPV)…

1%465 patients

Colorectal Cancer Screening

Percentage of adults 50-75 years of age who had appropriate screening for colorectal cancer

10%900 patients1/55-star benchmark: 85%

Diabetes: Eye Exam

Percentage of patients 18-75 years of age with diabetes who had a retinal or dilated eye exam by an eye care professional during the measurement period or a negative retinal exam (no evidence of retinopathy) in the 12 months prior to the measurement period

6%253 patients1/55-star benchmark: 100%

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

49%251 patients2/55-star benchmark: 99%

e-Prescribing

At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.

95%6,677 patients4/55-star benchmark: 100%

Falls: Screening for Future Fall Risk

Percentage of patients 65 years of age and older who were screened for future fall risk during the measurement period

94%574 patients4/55-star benchmark: 99%

Health Information Exchange

The MIPS eligible clinician that transitions or refers their patient to another setting of care or health care clinician (1) uses CEHRT to create a summary of care record; and (2) electronically transmits such summary to a receiving health care clinician for…

46%63 patients2/55-star benchmark: 96%

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.

28%1,630 patients2/55-star benchmark: 99%

Pneumococcal Vaccination Status for Older Adults

Percentage of patients 65 years of age and older who have ever received a pneumococcal vaccine

41%612 patients2/55-star benchmark: 90%

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…

89%1,668 patients4/55-star benchmark: 97%

Preventive Care and Screening: Influenza Immunization

Percentage of patients aged 6 months and older seen for a visit between October 1 and March 31 who received an influenza immunization OR who reported previous receipt of an influenza immunization

25%729 patients2/55-star benchmark: 88%

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…

48%1,630 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…

10%1,630 patients1/55-star benchmark: 59%

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.

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221

DME-Other DME · category DE017N

3 suppliers27 claims63 services$18.59 avg. paid by Medicare

Infusion supplies for external drug infusion pump, per cassette or bag (list drugs separately) A4222

DME-Medical/Surgical Supplies · category DA000N

2 suppliers14 claims20 services$37.06 avg. paid by Medicare

Injection, immune globulin (asceniv), 500 mg J1554

Treatment-Injections and Infusions (nononcologic) · category RI008N

1 supplier28 claims4,145 services$229.90 avg. paid by Medicare

Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg J1561

Treatment-Injections and Infusions (nononcologic) · category RI008N

1 supplier13 claims1,040 services$35.27 avg. paid by Medicare

Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552

DME-Other DME · category DE000N

1 supplier13 claims59 services$2.36 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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Other Providers at the Same Location NPPES 20

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

NANCY E BULA

Physical Therapist

150 E SONTERRA BLVD, 300
SAN ANTONIO, TX 78258

Bexar County (210) 489-7220

MAGNOLIA WOMEN'S CARE, P.L.L.C.

Obstetrics & Gynecology

150 E SONTERRA BLVD, SUITE 250
SAN ANTONIO, TX 78258

Bexar County (210) 748-7153

ALLISON HUTCHERSON PA-C

Physician Assistant (Medical)

150 E SONTERRA BLVD, STE 170
SAN ANTONIO, TX 78258

Bexar County (210) 481-2800

PHILLIP J TRUEMAN

Physical Therapist

150 E SONTERRA BLVD, 300
SAN ANTONIO, TX 78258

Bexar County (210) 489-7270

BRAD S TOLIN M.D.

Orthopaedic Surgery (Sports Medicine)

150 E SONTERRA BLVD, 300
SAN ANTONIO, TX 78258

Bexar County (210) 489-7240

SAN ANTONIO TX ENDOSCOPY ASC LP

Clinic/Center (Ambulatory Surgical)

150 E SONTERRA BLVD, SUITE 110
SAN ANTONIO, TX 78258

Bexar County (210) 491-9998

RUDY RIVERA

Physician Assistant

150 E SONTERRA BLVD, SUITE 220
SAN ANTONIO, TX 78258

Bexar County (210) 481-6800

ROBERT A ZAJAC MD PA

Internal Medicine (Infectious Disease)

150 E SONTERRA BLVD, SUITE 170
SAN ANTONIO, TX 78258

Bexar County (210) 481-2800

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 Robert Zajac's NPI number?

The NPI number for Robert Zajac is 1013907963. It was assigned to this individual provider in the NPPES registry on October 24, 2005.

Where is Robert Zajac located?

Robert Zajac practices at 150 E Sonterra Blvd Suite 170, San Antonio, TX 78258. The listed phone number is (210) 481-2800.

What is Robert Zajac's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Robert Zajac enrolled in Medicare?

Yes. Robert Zajac 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 Robert Zajac accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 4 other insurers list Robert Zajac 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 Robert Zajac affiliated with any hospitals?

According to CMS data, Robert Zajac is affiliated with Peterson Regional Medical Center, Baptist Medical Center, Val Verde Regional Medical Center, Medina Regional Hospital and Methodist Hospital Stone Oak.

When was this NPI record last updated?

The NPPES record for Robert Zajac was last updated on August 8, 2024. NPI Profile syncs with the weekly NPPES data releases published by CMS.