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Edit this profileAt a glance
- 4502 Medical Dr, San Antonio, TX 78229
About Dr. Walker
Based in San Antonio, TX, John A. Walker, M.D. is listed in the NPI registry under vascular & interventional radiology. John graduated from University of Texas Medical School at San Antonio in 2007. John is also listed as specializing in diagnostic radiology. According to Medicare claims data, John cared for 308 Medicare patients across 366 services. The services billed most often include use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes, ultrasonic guidance for blood vessel access, and review by radiologist of additional artery image. NPI 1477780344 identifies this record in the national registry.
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) 358-4000
- Email not available
Practice Locations
4502 MEDICAL DR
San Antonio, TX 78229
Conditions Commonly Evaluated or Treated
Within Interventional Radiology 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
- Deep vein thrombosis
- Enlarged prostate
- Peripheral artery disease
- Spinal compression fractures
- Uterine fibroids
- Varicose veins
Bone & Joint
- Benign Bone Tumor
- Heel pain
Brain & Spine
- Brain aneurysm
- Chronic Brain Bleed
- Stroke
Cancer
Digestive
- Acute gallbladder inflammation
- Ascites
- Benign Liver Tumor
- Bleeding Hemorrhoids
- Blocked Bile Duct
- Portal hypertension
Emergency vascular
Endocrine
Joint & bone pain
Kidney
Men's health
Pain
- Facet joint pain
- Sacroiliac joint pain
- Sciatica
- Severe Cancer Pain in Belly
Respiratory
Vascular
- Aortic aneurysm
- Blocked Chest Vein
- Blood Clot in Lung
- Brain Vascular Malformation
- Carotid Artery Blockage
- Chronic venous insufficiency
- Leg Ulcers
- Lymph Fluid Leak in Chest
- May-Thurner Syndrome
- Narrow kidney artery
- Nutcracker Syndrome
- Spider veins
- Torn Aorta
- Visceral Artery Aneurysm
Women's health
Procedures & services
Most searched procedures
- Angiogram
- Atherectomy
- Kyphoplasty
- Prostate artery embolization
- Uterine fibroid embolization
- Y-90 radioembolization
Bone & Joint
- Osteoid Osteoma Ablation
Brain & Spine
- Brain Aneurysm Coiling
- Image-Guided Lumbar Puncture
- Middle Meningeal Artery Embolization
Cancer
- Chemo port removal
- Kidney Tumor Ablation
- Microwave Ablation for Tumors
- Radiofrequency ablation
- TACE Chemoembolization
- Tumor Cryoablation
Diagnostic
Digestive
- Bile duct stent placement
- Feeding tube placement
- Gallbladder Drainage Tube Placement
- Hemorrhoid Embolization
- TIPS Procedure
Drainage
Emergency vascular
- Embolization for Internal Bleeding
Endocrine
- Thyroid Nodule Radiofrequency Ablation
Joint & bone pain
- Knee Embolization for Arthritis
- Vertebroplasty
Kidney
- Dialysis Fistula Repair
- Kidney Drainage Tube Placement
Kidney & Urinary
- Minimally Invasive Dialysis Fistula Creation
Men's health
- Varicocele Embolization
Pain
- Celiac Plexus Nerve Block
- Epidural steroid injection
- Radiofrequency Nerve Ablation
- Sacroiliac joint injection
Vascular
- Balloon Angioplasty for Legs
- Blood Clot Removal Surgery
- Carotid Artery Stent
- Catheter Clot Dissolving Treatment
- IVC Filter Placement
- IVC Filter Removal
- Laser Vein Treatment For Leg Swelling
- Minimally Invasive Aneurysm Repair
- Sclerotherapy
- Thoracic Duct Embolization
- Vascular Malformation Sclerotherapy
- Vein Blood Flow Study
- Vein Stent Placement
Vascular access
Women's health
Procedures Most Often Billed to Medicare
366 services · 308 patients · 13 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Needle biopsy of kidney | Procedure | 50200 |
18 | More often than most peers in Vascular & Interventional… |
| Insertion of central venous tube with port (5 years or older) | Procedure | 36561 |
13 | Less often than most peers in Vascular & Interventional… |
| Fine needle aspiration biopsy using ultrasound guidance, first growth | Procedure | 10005 |
11 | Less often than most peers in Vascular & Interventional… |
| Ultrasonic guidance for blood vessel access | Imaging | 76937 |
39 | As often as other peers in Vascular & Interventional… |
| Review by radiologist of additional artery image | Imaging | 75774 |
39 | As often as other peers in Vascular & Interventional… |
| Ultrasonic guidance for needle placement | Imaging | 76942 |
32 | More often than most peers in Vascular & Interventional… |
| Fluoroscopic guidance for insertion or removal of central vein access device | Imaging | 77001 |
25 | As often as other peers in Vascular & Interventional… |
| X-ray of chest, 1 view | Imaging | 71045 |
20 | Less often than most peers in Vascular & Interventional… |
| Review by radiologist of ct guidance for needle placement | Imaging | 77012 |
15 | Less often than most peers in Vascular & Interventional… |
| Ct scan of blood vessels of abdomen and pelvis with contrast | Imaging | 74174 |
11 | Less often than most peers in Vascular & Interventional… |
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.
Related specialists at this location 4
Clinically related specialties at the same address — the people this provider most likely works alongside.
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 interventional radiologists in San Antonio 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at University of Texas Medical School at San Antonio 8
Other providers in the same specialty who trained at the same institution.
Class of 2007 at University of Texas Medical School at San Antonio 8
Providers who graduated from the same medical school in the same year.
Also performs Needle biopsy of kidney 8
Providers in TX who bill this service to Medicare most often.
Common questions
What is John A. Walker's specialty?
John A. Walker is an interventional radiologist in San Antonio, TX. That is the designation recorded for this NPI in the federal registry, where it is listed as “Vascular & Interventional Radiology”.
NPI registry
Where can I find John A. Walker?
John A. Walker is listed at 4502 Medical Dr, San Antonio, TX 78229. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact John A. Walker?
The number on file is (210) 358-4000. Contact the office directly to confirm availability and scheduling.
NPI registry
What is John A. Walker's NPI number?
John A. Walker's National Provider Identifier is 1477780344. 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 John A. Walker's education?
John A. Walker attended University of Texas Medical School at San Antonio, graduating in 2007. This comes from the CMS National Downloadable File.
CMS public data
How long has John A. Walker been practicing?
John A. Walker has 19 years experience. Calculated from a graduation year of 2007, reported in the CMS National Downloadable File.
CMS public data
What is John A. Walker known for?
According to Medicare billing data, John A. Walker performs procedures including needle biopsy of kidney, insertion of central venous tube with port and fine needle aspiration biopsy using ultrasound guidance, first growth; reads or performs imaging such as ultrasonic guidance for blood vessel access and review by radiologist of additional artery image; provides treatments such as use of a drug to induce depression of consciousness by physician performing a procedure , initial 15 minutes, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has John A. Walker confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by John A. Walker. If this is you, claiming it is free.
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