Guillermo Lazo-Diaz, MD
Medical Oncology Internal Medicine
Guillermo Lazo-Diaz is a Medical Oncology Internal Medicine specialist based in Mcallen, TX with over 33 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: HEMATOLOGY/ONCOLOGY
Guillermo Lazo-Diaz, MD has practiced internal medicine for 33+ years, working in group practice. He has been practicing since 2006 — over 33 years. He regularly sees Medicare patients with hypertension, high cholesterol, and kidney disease (per CMS claims data). CMS MIPS quality score: 89.44/100 (2023).
At a glance
- Federal MIPS score higher than 71% of MIPS-scored doctors in Texas
- Virtual visits available — no app or travel required
Older · 6372dNPPES updated 2008-12-11 · verify NPI on CMS · Verify license at Texas Medical Board
Contact & Location
Practice Location
1901 S 2nd St, Mcallen, TX 78503-1271
How Does This Doctor Compare?
Based on Medicare data, this doctor scores better than 71% of doctors in Texas on federal quality measures.
MIPS Score
202389.44/100
Texas avg: 79.1 · US avg: 83.6
✓ Higher than most doctors nationally(+5.8 pts)
Better than 71% of MIPS-scored doctors in TexasHow the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Opioid Rx
↓ Lower = better11.81%
Texas avg: 5.2 · US avg: 5.1
⚠ Lower than most doctors nationally(+6.7 pts)
11.81% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better75%
Texas avg: 83.8 · US avg: 82.8
⚠ Lower than most doctors nationally(-7.8 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
353
Unique beneficiaries
Standard volumePrescription Recipients
255
Patients prescribed
Prescriptions Written
1,253
Total claims
Total Medicare drug cost: $4.53M
Percentile rankings compared against 4,889 reporting peers in Texas.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Chronic Kidney Disease.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+23%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+16%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-3%) — less common here
Diseases involving abnormal cell growth with potential to spread to other body parts
US avg: 20.8%↑ More patients than average (+21%) — a focus area for this doctor
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↑ More patients than average (+6%) — a focus area for this doctor
Excessive worry or fear that interferes with daily life
US avg: 34.1%↓ Fewer patients than average (-5%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$442 received from industry
15 transactions reported in 2024 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Guillermo Lazo-Diaz's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
33 years in practice
Senior practitioner
Medical oncologists diagnose and treat cancer using chemotherapy, immunotherapy, targeted therapy, and hormone therapy. They coordinate care with surgical oncologists and radiation oncologists for comprehensive cancer treatment.
Taxonomy: 207RX0202X
Mailing address
Po Box 911230, Dallas, TX 75391-1230
Differs from practice location
Virtual Medical Oncology Care With Guillermo Lazo-Diaz
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Guillermo Lazo-Diaz for blood pressure monitoring, cholesterol management, kidney care follow-ups — no travel to Mcallen required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Guillermo Lazo-Diaz
Dr. Lazo-Diaz is listed as active in the NPI registry with telehealth listed in Mcallen, TX. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (956) 687-5150.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Guillermo Lazo-Diaz
Practice Location
1901 S 2nd St, Mcallen, TX 78503-1271
Mailing Address
Po Box 911230, Dallas, TX 75391-1230
This is a provider directory. Contact the office directly to schedule appointments.
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