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Edit this profileAt a glance
- 409 Madrid St, Castroville, TX 78009
About Dr. Nguyen
Mary S. Nguyen, M.D. is a healthcare provider in Castroville, TX specializing in family medicine. Mary trained at University of Texas Medical School at Houston, graduating in 1997. Medicare claims data shows Mary provided 1,204 services to 901 patients. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient'. This provider record is associated with NPI 1356339717.
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
- (830) 538-2254
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
409 MADRID ST
Castroville, TX 78009
Conditions Commonly Evaluated or Treated
Within Family Medicine 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
Bariatrics
Cancer Prevention
Cancer risk
Digestive
Environmental health
- Asbestos Exposure
- Contaminated drinking water exposure
- Heat exhaustion and heat stroke
- Radon gas exposure
- Tick bite and Lyme disease risk
- Toxic Mold Exposure
- Wildfire smoke and air pollution exposure
- Workplace Chemical Exposure
General wellness
Heart health
Infectious Disease
Infectious disease
Kidney health
Lifestyle & wellness
Lifestyle health
Longevity
Metabolic & Lifestyle
Occupational health
Occupational Health
Rashes & allergy
Sexual Health
Sexual health
Substance use
Travel health
Wellness and energy
Workplace health
Wounds & skin
- Severe skin tears
Most searched conditions
Cardiometabolic
Genitourinary and reproductive
Musculoskeletal and pain
Neurologic and behavioral
Respiratory and infectious
Skin
Common childhood and ear conditions
Pain & Joints
- Arthritis
- Back pain
Procedures & services
Addiction & habits
Bladder & bowel
- Skin barrier and rash care for incontinence
Breathing
- Nebulizer Breathing Treatment Training
Cancer Screening
Cancer screening
Checkups & exams
Chronic illness
Diagnostic testing
Diagnostic Tests
- COVID-19 Rapid Test
- COVID-19 testing
- Rapid Flu Swab
- Rapid Strep and Flu Swabs
- Urine Pregnancy Test
- Urine Drug Screen
Diagnostics & screening
Environmental health
Exams
Exams & Screenings
- Camp and School Physical
- Pre-Op Clearance Exam
Fitness & body composition
Foot and Leg Pain
- Toenail Fungus Treatment
Heart & Circulation
Heart & circulation
Immunizations
Infection & Microbiology Tests
- Colon cancer screening consult
- STI and STD Screening
- H. Pylori Breath Test
Lifestyle & Prevention
Longevity
Lower endoscopy
Metabolic health
Minor Procedures
- Burn and Wound Care
- Ingrown toenail removal
- Suture removal
Occupational health
Occupational Health
Office procedures
- Minor laceration repair
- Removal of a minor skin lesion
- Superficial foreign-body removal
- Earwax removal
- Incision and drainage of an abscess
Post-Op Care
Preventive and evaluation
Preventive Care
- Chronic Illness Checkup
- Travel Vaccines And Consult
- Routine Vaccines
Preventive imaging
Preventive interventions
- Vaccinations and immunizations
- Weight-management counseling
- Birth control counseling
- Smoking cessation counseling
Preventive screening
Routine Blood Tests
Screening & labs
Screening and diagnostic testing
Screening and testing
- Blood pressure screening
- Diabetes and prediabetes screening
- Point-of-care laboratory testing
- Cholesterol screening
- Depression screening
- EKG
Skin Procedures
- Cyst Removal
- Precancerous Sun Spot Freezing
- Skin Tag Removal
- Wart Removal
Sleep Health
Travel Health
Travel medicine
Urgent Care Procedures
Wellness
Wellness & Screening
Wellness & Weight
- Weight Management Consult
Women's Health
Workplace health
Wound care
Wounds & skin
- Bedsore staging and treatment
- Wound dressing and care
Sleep
Most searched procedures
Injections
- Immunotherapy
- Vitamin B12 Injections
Lungs & Breathing
- Pulmonary function test
Pain Management
- Joint injections
Respiratory
Senior Care
- Cognitive Assessment
Sexual & Reproductive Health
Procedures Most Often Billed to Medicare
1,204 services · 901 patients · 15 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
38 | Less often than most peers in Family Medicine |
| Assessment of emotional or behavioral problems | Treatment | 96127 |
21 | Less often than most peers in Family Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
231 | More often than most peers in Family Medicine |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
144 | More often than most peers in Family Medicine |
| Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient' | Billing code | G2211 |
135 | As often as other peers in Family Medicine |
| Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | Office visit | 99490 |
133 | As often as other peers in Family Medicine |
| Advance care planning, first 30 minutes | Office visit | 99497 |
84 | More often than most peers in Family Medicine |
| Annual alcohol misuse screening, 5 to 15 minutes | Billing code | G0442 |
83 | As often as other peers in Family Medicine |
| Annual, face-to-face intensive behavioral therapy for cardiovascular disease, individual, 15 minutes | Billing code | G0446 |
81 | As often as other peers in Family Medicine |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | Billing code | G0439 |
78 | As often as other peers in Family Medicine |
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.
Other family doctors at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 3
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 29 related providers in 4 groups
Other family doctors in Castroville 5
Same specialty, same city.
Trained at University of Texas Medical School at Houston 8
Other providers in the same specialty who trained at the same institution.
Class of 1997 at University of Texas Medical School at Houston 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in TX who bill this service to Medicare most often.
Common questions
What is Mary S. Nguyen's specialty?
Mary S. Nguyen is a family doctor in Castroville, TX. That is the designation recorded for this NPI in the federal registry, where it is listed as “Family Medicine”.
NPI registry
Where can I find Mary S. Nguyen?
Mary S. Nguyen is listed at 409 Madrid St, Castroville, TX 78009. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Mary S. Nguyen?
The number on file is (830) 538-2254. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Mary S. Nguyen?
Mary S. Nguyen's National Provider Identifier is 1356339717. 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
What is Mary S. Nguyen's education?
Mary S. Nguyen attended University of Texas Medical School at Houston, graduating in 1997. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Mary S. Nguyen have?
Mary S. Nguyen has 29 years experience. Calculated from a graduation year of 1997, reported in the CMS National Downloadable File.
CMS public data
What is Mary S. Nguyen known for?
According to Medicare billing data, Mary S. Nguyen performs procedures including insertion of needle into vein for collection of blood sample; provides treatments such as assessment of emotional or behavioral problems, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Mary S. Nguyen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Mary S. Nguyen. If this is you, claiming it is free.
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