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Edit this profileAt a glance
- 30 Harrison St, Ste 455, Johnson City, NY 13790
About Dr. Brennan
Based in Johnson City, NY, Mark Brennan, DO is listed in the NPI registry under vascular surgery. Mark graduated from Philadelphia College of Osteopathic Medicine in 1994. Mark is also listed as specializing in surgery. Medicare claims data shows Mark provided 143 services to 129 patients. The services billed most often include ultrasonic guidance for blood vessel access, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and fluoroscopic guidance for insertion or removal of central vein access device. NPI 1174523443 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
- (607) 763-8100
- Email not available
Practice Locations
30 HARRISON ST STE 455
Johnson City, NY 13790
Conditions Commonly Evaluated or Treated
Within Vascular Surgery 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
- Carotid artery disease
- Deep vein thrombosis
- Peripheral artery disease
- Spider veins
- Varicose veins
Aneurysms
- Groin Artery Bulge
- Knee Artery Aneurysm
- Visceral Artery Aneurysm
Aortic disease
- Aortic aneurysm
- Torn Aorta
Artery conditions
- Buerger's Disease
- Pelvic Artery Blockage
Artery disease
- Cold Sensitive Fingers and Toes
- Fibromuscular Dysplasia
- Mesenteric ischemia
- Narrow kidney artery
- Subclavian Steal Syndrome
Artery inflammation
- Temporal Arteritis
Blood clots
- Blood Clot in Arm or Leg
- Blood Clot in Lung
- Long-Term Leg Swelling After Clot
Congenital vascular disorders
Dialysis
- Dialysis Access Problems
Digestive & abdominal
- Stomach Pain After Eating From Arteries
Emergencies
- Acute Leg Compartment Syndrome
Foot & toe conditions
- Blue Toe Syndrome
Leg & foot pain
- Leg Cramps When Walking
- Non-Healing Foot Sores From Poor Blood Flow
- Restless legs syndrome
Nerve & vessel compression
- Nutcracker Syndrome
- Popliteal Artery Entrapment
- Thoracic outlet syndrome
Skin & vein conditions
- Leg Skin Discoloration From Veins
Vascular malformations
- Klippel-Trenaunay Syndrome
Vascular tumors
- Carotid Body Tumor
Vein conditions
Vein disease
- Chronic pelvic pain
- Lymphedema
- May-Thurner Syndrome
- Poor Circulation and Swollen Legs
Wounds & sores
- Arterial Leg Ulcer
Wounds & ulcers
- Diabetic foot ulcer
- Gangrene
- Venous Leg Ulcers
Procedures & services
Most searched procedures
- Bypass surgery
- Carotid endarterectomy
- Sclerotherapy
- Spider vein removal
- Varicose vein treatment
- Vein ablation
Amputation surgery
- Below-Knee Leg Amputation
Aneurysm repair
- Complex Branched Aortic Aneurysm Repair
- Minimally Invasive Aneurysm Repair
- Open Aortic Aneurysm Surgery
- Popliteal Aneurysm Repair
- Pseudoaneurysm Injection Repair
- Thoracic Endovascular Aortic Repair
- Visceral Aneurysm Coiling
Artery procedures
- Atherectomy
- Balloon Angioplasty for Legs
- Carotid Artery Stent
- Leg Artery Stent
- Limb Salvage Surgery
- Mesenteric Artery Stenting
- Renal artery stenting
- Transcarotid Artery Revascularization
Artery surgery
- Groin Artery Plaque Removal
Blood clot treatments
- Pulmonary Embolism Clot Removal
Blood clots
- Blood Clot Removal Surgery
- Catheter Clot Dissolving Treatment
- IVC Filter Placement
- IVC Filter Removal
Diagnostic procedures
- Temporal Artery Biopsy
Diagnostic tests
- Abdominal Aortic Aneurysm Ultrasound Screening
- Vein Mapping Ultrasound
Dialysis access
- Dialysis Fistula Surgery
- Dialysis Graft Placement
- Fistula Repair and Declotting
Emergency surgery
- Fasciotomy for Leg Swelling
Imaging & diagnostics
- Carotid Ultrasound
- Leg Circulation Test (ABI and Arterial Doppler)
- Leg Vein Ultrasound
- Peripheral Angiogram
Nerve & vessel compression
- Thoracic Outlet Decompression
Nerve surgery
- Surgery for sweaty hands
Vascular access
- Chemo port placement
- Chemo port removal
- Dialysis Catheter Removal
- Tunneled Dialysis Catheter Placement
Vascular malformation treatments
- Vascular Malformation Embolization
Vein procedures
- Ambulatory Phlebectomy
- Iliac Vein Stenting
- Pelvic Vein Embolization
- Varicose vein removal
Vein treatments
- Medical Compression Stocking Fitting
- Microfoam Vein Injection
- Vein Glue Closure
Wound care
- Surgical Wound Care
- Toe or Partial Foot Amputation
Procedures Most Often Billed to Medicare
143 services · 129 patients · 7 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle and/or tube into hemodialysis circuit and balloon dilation of dialysis segment with review by radiologist | Procedure | 36902 |
19 | Less often than most peers in Vascular Surgery |
| Insertion of tunneled central venous tube for infusion (5 years or older) | Procedure | 36558 |
18 | As often as other peers in Vascular Surgery |
| Ultrasonic guidance for blood vessel access | Imaging | 76937 |
37 | As often as other peers in Vascular Surgery |
| Fluoroscopic guidance for insertion or removal of central vein access device | Imaging | 77001 |
20 | As often as other peers in Vascular Surgery |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
20 | Less often than most peers in Vascular Surgery |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
15 | Less often than most peers in Vascular Surgery |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
14 | Less often than most peers in Vascular Surgery |
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 vascular surgeons at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 6
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.
More connections — 24 related providers in 3 groups
Trained at Philadelphia College of Osteopathic Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1994 at Philadelphia College of Osteopathic Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle and/or tube into hemodialysis circuit and balloon dilation of dialysis segment with review by radiologist 8
Providers in NY who bill this service to Medicare most often.
Common questions
What does Dr. Brennan specialize in?
Dr. Brennan is a vascular surgeon in Johnson City, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Vascular Surgery”.
NPI registry
Where is Dr. Brennan located?
Dr. Brennan is listed at 30 Harrison St Ste 455, Johnson City, NY 13790. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Brennan's phone number?
The number on file is (607) 763-8100. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Brennan?
Dr. Brennan's National Provider Identifier is 1174523443. 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
Where did Dr. Brennan go to medical school?
Dr. Brennan attended Philadelphia College of Osteopathic Medicine, graduating in 1994. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Brennan have?
Dr. Brennan has 32 years experience. Calculated from a graduation year of 1994, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Brennan do most often?
According to Medicare billing data, Dr. Brennan performs procedures including insertion of needle and/or tube into hemodialysis circuit and balloon dilation of dialysis segment with review by radiologist and insertion of tunneled central venous tube for infusion; reads or performs imaging such as ultrasonic guidance for blood vessel access and fluoroscopic guidance for insertion or removal of central vein access device, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Brennan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Brennan. If this is you, claiming it is free.
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