Physician Profile
Warren J. Gasper, M.D.
Unclaimed ProfileAbout Dr. Gasper
Based in San Francisco, CA, Warren J. Gasper, M.D. is listed in the NPI registry under surgery. Warren graduated from University of Maryland School of Medicine in 2003. Warren is also listed as specializing in vascular surgery. According to Medicare claims data, Warren cared for 662 Medicare patients across 771 services. The services billed most often include complete ultrasound study of arm and leg arteries, ultrasound of leg arteries or artery grafts, and ultrasound study of arm or leg veins with compression and maneuvers.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
- (415) 476-1239
- Email not available
Practice Locations
513 PARNASSUS AVE # S-321 UCSF DEPARTMENT OF SURGERY
San Francisco, CA 94143
Conditions Commonly Evaluated or Treated
Within Surgery (Unspecified) 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
Breast conditions
Cancer
- Colon cancer
- Esophageal cancer
- Liver cancer
- Neuroendocrine Tumors
- Pancreatic cancer
- Soft-tissue sarcoma
- Stomach cancer
- Thyroid cancer
Colorectal
Digestive
- Abdominal adhesions
- Acid reflux
- Acute pancreatitis
- Bowel obstruction
- Colon polyps
- Diverticulitis
- Gastroparesis
- Peptic ulcer disease
Digestive & blood
Digestive health
- Crohn's disease
- Fecal incontinence
- Perforated bowel
- Severe chronic constipation
- Swallowing difficulties
- Ulcerative colitis
Endocrine
Infections
Lumps & bumps
Lymphatic
Minor surgery
Skin & scars
Skin & soft tissue
Skin cancer
Vascular
Weight & metabolism
Wound care
Wounds
Procedures & services
Most searched procedures
Abdominal
Abdominal surgery
Bariatric
Breast surgery
Cancer
Cancer surgery
Colorectal
- Anal fistula surgery
- Anal Sphincter Repair
- Colon resection
- Hemorrhoid removal
- Ostomy reversal
- Ostomy surgery
- Rectal prolapse repair
- Surgery for chronic anal fissure
Consultations
Diagnostic
Digestive
Digestive health
Endocrine
Infections
Minor surgery
Post-op care
Reconstruction
Skin & soft tissue
- Cyst Removal
- Lipoma removal
- Mole removal
- Pilonidal cyst surgery
- Scar revision surgery
- Skin Tag Removal
Skin cancer
Vascular
Vascular & cancer
Weight loss
Wound care
Wounds
Procedures Most Often Billed to Medicare
771 services · 662 patients · 12 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Limited ultrasound scan behind abdominal cavity | Imaging | 76775 |
33 | More often than most peers in Surgery |
| Complete ultrasound study of arm and leg arteries | Treatment | 93923 |
216 | More than most peers in Surgery |
| Ultrasound of leg arteries or artery grafts | Treatment | 93925 |
163 | More than most peers in Surgery |
| Ultrasound study of arm or leg veins with compression and maneuvers | Treatment | 93970 |
59 | As often as other peers in Surgery |
| Ultrasound of one leg arteries or artery grafts | Treatment | 93926 |
54 | More often than most peers in Surgery |
| Ultrasound of both sides of head and neck blood flow | Treatment | 93880 |
48 | As often as other peers in Surgery |
| Complete ultrasound of abdomen and pelvis artery and vein blood flow | Treatment | 93975 |
41 | More often than most peers in Surgery |
| Ultrasound study of one arm or leg veins with compression and maneuvers | Treatment | 93971 |
40 | As often as other peers in Surgery |
| Complete ultrasound of aorta, vena cava, groin vessels or bypass grafts | Treatment | 93978 |
35 | As often as other peers in Surgery |
| Ultrasound study of arm and leg arteries | Treatment | 93922 |
35 | As often as other peers in 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 general surgeons at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
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 — 31 related providers in 4 groups
Other general surgeons in San Francisco 7
Same specialty, same city.
Trained at University of Maryland School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2003 at University of Maryland School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Limited ultrasound scan behind abdominal cavity 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Warren J. Gasper specialize in?
Warren J. Gasper is a general surgeon in San Francisco, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Surgery”.
NPI registry
Where is Warren J. Gasper located?
Warren J. Gasper is listed at 513 Parnassus Ave # S-321 Ucsf Department of Surgery, San Francisco, CA 94143. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Warren J. Gasper's phone number?
The number on file is (415) 476-1239. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Warren J. Gasper's NPI number?
Warren J. Gasper's National Provider Identifier is 1427186212. 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 Warren J. Gasper train?
Warren J. Gasper attended University of Maryland School of Medicine, graduating in 2003. This comes from the CMS National Downloadable File.
CMS public data
How long has Warren J. Gasper been practicing?
Warren J. Gasper has 23 years experience. Calculated from a graduation year of 2003, reported in the CMS National Downloadable File.
CMS public data
What does Warren J. Gasper do most often?
According to Medicare billing data, Warren J. Gasper performs imaging including limited ultrasound scan behind abdominal cavity; provides treatments such as complete ultrasound study of arm and leg arteries and ultrasound of leg arteries or artery grafts. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Warren J. Gasper confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Warren J. Gasper. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.