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Dr. Guillermo D. Marquez, MD
NPI1861454563PAC ID1850425570
- Medicare services, 2024
- 75
- Medicare patients, 2024
- 70
- Part D claims, 2024
- 20
- Publications
- 3
- Hospital affiliations
- 2
- Practice address
- 910 S Bryan Rd Suite 202 Suite 202, Mission, TX 78572-6659
- Practice phone
- Call (956) 682-6126
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Rgv Surgical Associates
Surgical practice · Mission, Texas
Find Dr. Marquez's professional email, personal email and mobile number
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Dr. Guillermo D. Marquez is a general surgeon in Mission, Texas
Dr. Marquez practices at Rgv Surgical Associates in Mission, Texas.
Dr. Marquez's NPI, 1861454563, was assigned on April 6, 2006. Dr. Marquez graduated from Facultad de medicina y Nutricion UJED in 2018. Dr. Marquez holds Texas license K1544.
NPI and contact details
- NPI
- 1861454563NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1850425570
- NPI enumeration date
- April 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (956) 682-6126
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Guillermo D. Marquez practices at Rgv Surgical Associates in Mission, Texas
Dr. Marquez's primary practice is Rgv Surgical Associates, at 910 S Bryan Rd Suite 202 Suite 202, Mission, TX 78572-6659. The practice phone is (956) 682-6126.
- Rgv Surgical Associates910 S Bryan Rd Suite 202 Suite 202, Mission, TX 78572-6659Phone(956) 682-6126
Source: Dmand AI Affiliation Data
Dr. Guillermo D. Marquez is affiliated with 4 sites of care and 2 medical groups
Dr. Marquez's primary practice is Rgv Surgical Associates in Mission, Texas. Dr. Marquez is also affiliated with Mission Regional Medical Center. The medical group on file is RGV Surgical Associates. Dmand AI also links Dr. Marquez to 1 more hospital, 1 group practice or clinic and 1 medical group, each named with a free account.
Rgv Surgical AssociatesPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Guillermo D. Marquez's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marquez practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Rgv Surgical Associates | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Guillermo D. Marquez is one of 1,939 general surgeons in Texas
Surgery is Dr. Marquez's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Marquez is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Marquez's licenses on file in 2 states: Texas and Illinois.
Specialties and state licenses
- Surgery, TexasPrimary
- Illinois license
Clinical focus
Dmand AI lists colon removal, gallbladder removal, groin hernia surgery and mastectomy among the conditions Dr. Marquez treats.
General surgeons near Dr. Marquez
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
1,939general surgeons in Texas
3general surgeons in Mission
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Guillermo D. Marquez billed Medicare for 75 services in 2024
CMS data shows 75 Medicare services from Dr. Marquez across 3 procedure codes in 2024, all of them office visits, for 70 Medicare patients. Medicare paid $5,070 for them. Every service was in an office.
Medicare services, 202475
Medicare patients70
Paid by Medicare$5,070
Procedure codes3
Dr. Marquez's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1212024: 7538%
Dr. Marquez compared with the Texas median for general surgeons, 2024
- Dr. Marquez
- Texas median
- Medicare services
- 75vs 11836% below
- Medicare patients
- 70vs 9728% below
- Part D claims
- 13vs 4269% below
Medians across 1,674 general surgeons in Texas with Dmand AI profiles that report each measure.
Dr. Marquez's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Marquez?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marquez and other general surgeons in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Guillermo D. Marquez treated 70 Medicare patients in 2024, average age 74
CMS counts 70 Medicare patients who saw Dr. Marquez in 2024. The largest group is 65 to 74, with 26 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 31% are also on Medicaid. Their average risk score is 2.21, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Marquez's median patient age at 57, with 80% women.
Medicare patients, 202470
Average age74
Average risk score2.21
Also on Medicaid31%
Dr. Marquez's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marquez's Medicare patients by sex, 2024
- Women5477%
- Men1623%
Chronic conditions among Dr. Marquez's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis56%
- Chronic kidney disease44%
- Diabetes43%
- Ischemic heart disease36%
- Mood disorders30%
- Depression29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marquez's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women80%
- Men20%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Guillermo D. Marquez wrote 20 Medicare Part D claims in 2024
In 2024, Dr. Marquez wrote 20 Medicare Part D claims for 14 patients. 85% of them were for generic drugs. CMS names the drug for 13 of them, across 1 drug with 11 or more claims each, at $105 in total drug cost. In 2022, CMS named 37 claims across 2 drugs.
Part D claims, 202420
Drugs named by CMS1
Total drug cost$105
Part D patients14
Dr. Marquez's Part D claims by kind of drug, 2024
- Generic17 claims85%
- Brand-name and other3 claims15%
Dr. Marquez's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 372023: 1365%
Drugs named by CMS: 1 in 2023, 2 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Guillermo D. Marquez takes part in Medicare
Dr. Marquez accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)
Mastectomy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Guillermo D. Marquez has 3 publications on record
Dmand AI links 3 papers to Dr. Marquez. The most frequent topics are Biomarkers, Tumor, Diagnostic Imaging and Early Detection of Cancer. Dr. Marquez's most frequent co-authors are Sudhir Prem Srivastava, MD, Suresh T. Chari, MD and Amit Singal, MD.
Papers3
Topics Dr. Marquez writes about most
- Biomarkers, Tumor
- Diagnostic Imaging
- Early Detection of Cancer
Dr. Marquez's most frequent co-authors
- Sudhir Prem Srivastava, MD2 shared papers
- Suresh T. Chari, MD1 shared paper
- Amit Singal, MD1 shared paper
Recent publications by Dr. Marquez
Artificial IntelligenceBiomarkers, TumorDiagnostic Imaging
Cancer Epidemiol Biomarkers Prev
Biomarkers, TumorEarly Detection of CancerResearch Design
See who Dr. Marquez researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marquez works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Guillermo D. Marquez received $7,455 in industry payments from 2017 to 2025
CMS Open Payments shows 13 general payments to Dr. Marquez from 5 drug and device companies from 2017 to 2025. Grants make up the largest share, 87% of the total. Smith & Nephew, Inc. paid the most, $5,192.
General payments to Dr. Marquez by program year, 2017 to 2025
General payments to Dr. Marquez by kind, 2017 to 2025
$7.5Kin total
- Grants$6,50087%
- Food and beverage$5237%
- Travel and lodging$2393%
- Education$1923%
Companies that paid Dr. Marquez the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Guillermo D. Marquez graduated from Facultad de medicina y Nutricion UJED
Dr. Marquez graduated from Facultad de medicina y Nutricion UJED in 2018.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Guillermo D. Marquez accepts plans from 23 insurance carriers
Dr. Marquez is in network with 23 carriers, including Aetna, United Healthcare and Cigna. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Cigna
- Elevance
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- Blue Cross Blue Shield of Massachusetts
- +15 more carriersWith a free account
Plan types Dr. Marquez accepts, by number of carriers
- PPO14
- HMO12
- Medicare9
- EPO4
- POS4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Guillermo D. Marquez's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Guillermo D. Marquez
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Guillermo D. Marquez's NPI number?
Dr. Guillermo D. Marquez's NPI number is 1861454563. It was assigned on April 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Guillermo D. Marquez?
Dr. Guillermo D. Marquez is a general surgeon in Mission, Texas. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Guillermo D. Marquez practice?
Dr. Marquez practices at 910 S Bryan Rd Suite 202 Suite 202, Mission, TX 78572-6659. Dr. Marquez's primary practice is Rgv Surgical Associates in Mission, Texas. Dmand AI also links Dr. Marquez to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Guillermo D. Marquez's office phone number?
The practice phone on file for Dr. Marquez is (956) 682-6126.
What is Dr. Guillermo D. Marquez's medical license number?
Dr. Marquez holds Texas license K1544, one of the licenses on file in 2 states.
Which states has Dr. Guillermo D. Marquez been licensed in?
Dmand AI has state licenses on file for Dr. Marquez in Texas (1996 to 2026) and Illinois (1990 to 1999).
Which hospitals is Dr. Guillermo D. Marquez affiliated with?
Dr. Marquez is affiliated with Mission Regional Medical Center. Dmand AI links Dr. Marquez to 1 more hospital.
What medical group is Dr. Guillermo D. Marquez part of?
Dr. Marquez is linked to RGV Surgical Associates. Dmand AI links Dr. Marquez to 1 more medical group.
Does Dr. Guillermo D. Marquez accept Medicare?
Yes. CMS data shows Dr. Marquez billed Medicare for 75 services in 2024, and Dr. Marquez accepts Medicare assignment.
How many Medicare patients does Dr. Guillermo D. Marquez see?
CMS counts 70 Medicare patients who saw Dr. Marquez in 2024, with an average age of 74.
Show 9 more questionsShow fewer questions
Is Dr. Guillermo D. Marquez board certified?
Yes. Dr. Marquez is board certified in surgery by the American Board of Surgery.
What services does Dr. Guillermo D. Marquez bill to Medicare?
In 2024, Dr. Marquez's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99203) and office visit, established patient (99214).
Where did Dr. Guillermo D. Marquez go to medical school?
Dr. Marquez graduated from Facultad de medicina y Nutricion UJED in 2018.
What drugs does Dr. Guillermo D. Marquez prescribe most?
In 2023 Medicare Part D data, Dr. Marquez's most prescribed drugs by claims were Acetaminophen-Codeine.
Has Dr. Guillermo D. Marquez received payments from drug or device companies?
CMS Open Payments shows $7,455 in general payments to Dr. Marquez from 5 companies from 2017 to 2025. The largest total came from Smith & Nephew, Inc.
How long has Dr. Guillermo D. Marquez been practicing?
Dr. Marquez graduated from medical school in 2018, 8 years ago.
Does Dr. Guillermo D. Marquez do research?
Dmand AI links 3 publications to Dr. Marquez.
Who does Dr. Guillermo D. Marquez publish with?
Dr. Marquez's most frequent co-authors are Sudhir Prem Srivastava, MD (2 shared papers), Suresh T. Chari, MD (1 shared paper) and Amit Singal, MD (1 shared paper).
What insurance does Dr. Guillermo D. Marquez accept?
Dr. Marquez is in network with 23 carriers, including Aetna, United Healthcare and Cigna. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
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