Dr. Warren J. Gasper, MD

  • San Francisco, CA
  • General surgeon
NPI1427186212PAC ID4486895125
Medicare services, 2024
771
Medicare patients, 2024
417
Publications
100
Clinical trials
9
MIPS score, 2024
98
Practice address
505 Parnassus Ave, Box 0296, San Francisco, CA 94143
Practice phone
Call (415) 353-2733
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

UCSF Helen Diller Medical Center at Parnassus Heights

Hospital · San Francisco, California

See all 12 affiliations

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Dr. Warren J. Gasper is a general surgeon in San Francisco, California

Dr. Gasper practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.

Dr. Gasper's NPI, 1427186212, was assigned on March 1, 2007. Dr. Gasper graduated from University of Maryland School of Medicine in 2003. Dr. Gasper holds California license A89802.

NPI and contact details
Medicare PAC ID
4486895125
NPI enumeration date
March 1, 2007
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(415) 353-2733
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Male
Estimated age
49
Medical school graduation
2003

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Warren J. Gasper practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California

Dr. Gasper's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights, at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143 in San Francisco County. The practice phone is (415) 353-2733.

Source: Dmand AI Affiliation Data

Dr. Warren J. Gasper is affiliated with 6 sites of care and 6 medical groups

Dr. Gasper's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. The medical group on file is UCSF Pediatrics. Dmand AI also links Dr. Gasper to 5 more group practices and clinics and 5 medical groups, each named with a free account.

See all 12 affiliations for Dr. Gasper

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Warren J. Gasper's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gasper practices, 6 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
UCSF Helen Diller Medical Center at Parnassus HeightsAvailable with a free account
+5 more sites and 5 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

For health IT teams

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Dr. Warren J. Gasper is one of 2,926 general surgeons in California

Surgery is Dr. Gasper's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Gasper is licensed in California.

Specialties and state licenses

  • Surgery, CaliforniaPrimaryLicense A89802 · taxonomy 208600000X

General surgeons near Dr. Gasper

Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Warren J. Gasper billed Medicare for 771 services in 2024

CMS data shows 771 Medicare services from Dr. Gasper across 12 procedure codes in 2024, for 417 Medicare patients. Medicare paid $18,332 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024771
Medicare patients417
Paid by Medicare$18,332
Procedure codes12

Dr. Gasper's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Tests and treatments
2023: 8102024: 7389%
Imaging
2023: 212024: 3357%

Dr. Gasper compared with the California median for general surgeons, 2024

  • Dr. Gasper
  • California median
Medicare services
771vs 1664.6 times
Medicare patients
417vs 1213.4 times

Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.

Dr. Gasper'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.

See all procedures by Dr. Gasper

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Warren J. Gasper treated 417 Medicare patients in 2024, average age 75

CMS counts 417 Medicare patients who saw Dr. Gasper in 2024. The largest group is 65 to 74, with 155 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 41% are also on Medicaid. Their average risk score is 2.57, 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. Gasper's median patient age at 69, with 43% women.

Medicare patients, 2024417
Average age75
Average risk score2.57
Also on Medicaid41%

Dr. Gasper's Medicare patients by age, 2024

Dr. Gasper's Medicare patients by sex, 2024

  • Women16840%
  • Men24960%

Chronic conditions among Dr. Gasper's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Chronic kidney disease50%
  4. Ischemic heart disease49%
  5. Arthritis47%
  6. Diabetes42%
  7. Heart failure31%
  8. Mood disorders28%

Share of Medicare patients with each condition. A patient can have several.

Dr. Gasper's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 69

Patient panel by sex, all payers

  • Women43%
  • Men55%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Warren J. Gasper scored 98 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 98 out of 100 for Dr. Gasper for performance year 2024, reported as part of a group. Dr. Gasper accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gasper as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Dr. Gasper's MIPS scores, performance year 2024

  • 98of 100Final score
  • 92.7of 100Quality
  • 40of 100Improvement Activities
  • 72of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Leg revascularization (restoring blood flow): 1 to 10 procedures (CMS shows small counts as a range)

Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)

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Dr. Warren J. Gasper has 100 publications on record

Dmand AI links 100 papers to Dr. Gasper, published from 2007 to 2025. 2023 was the busiest year, with 13. The most frequent topics are Endovascular Procedures, Blood Vessel Prosthesis Implantation and Aortic Aneurysm, Thoracic. Dr. Gasper has published most often in J Vasc Surg. Dr. Gasper's most frequent co-authors are Michael Salvatore Conte, MD, Andres Schanzer, MD and Adam Beck, MD.

Papers100
Years published2007 to 2025

Dr. Gasper's papers by year, 2016 to 2025

Topics Dr. Gasper writes about most

  • Endovascular Procedures
  • Blood Vessel Prosthesis Implantation
  • Aortic Aneurysm, Thoracic
  • Peripheral Arterial Disease
  • Aortic Aneurysm, Abdominal
  • Blood Vessel Prosthesis
  • Postoperative Complications
  • Stents

Dr. Gasper's most frequent co-authors

Recent publications by Dr. Gasper

See all 100 publications and co-authors

See who Dr. Gasper researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gasper works with, so you can find a warm path to the right general surgeons.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Warren J. Gasper has worked on 9 clinical trials

Dmand AI links Dr. Gasper to 9 clinical trials. 2 are still active or recruiting. Conditions studied include Chronic Limb-Threatening Ischemia, Aortic Aneurysm, Abdominal and Intermittent Claudication. University of California, San Francisco sponsors the most, 6.

Clinical trials with Dr. Gasper by phase

  1. NonePhase 1: no trials
  2. 1Phase 2: 1 trial
  3. NonePhase 3: no trials
  4. 1Phase 4: 1 trial

Trials with no phase (devices, behavioral studies) are left out.

Conditions in Dr. Gasper's trials

  • Chronic Limb-Threatening Ischemia
  • Aortic Aneurysm, Abdominal
  • Intermittent Claudication
  • Aortic Aneurysm, Thoracoabdominal
  • Arteriovenous Fistula

Investigators on the most trials with Dr. Gasper

Recent clinical trials with Dr. Gasper

See all 9 clinical trials and co-investigators

Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)

Dr. Warren J. Gasper received $17,434 in industry payments from 2016 to 2025

CMS Open Payments shows 112 general payments to Dr. Gasper from 18 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 40% of the total. Provisio Medical paid the most, $7,143.

General payments to Dr. Gasper by program year, 2016 to 2025

General payments to Dr. Gasper by kind, 2016 to 2025

$17.4Kin total
  • Food and beverage$6,97640%
  • Consulting fees$6,83539%
  • Travel and lodging$3,62321%

Companies that paid Dr. Gasper the most, 2016 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Gasper

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Warren J. Gasper graduated from University of Maryland School of Medicine

Dr. Gasper graduated from University of Maryland School of Medicine in 2003.

  1. Medical schoolUniversity of Maryland School of Medicine

Source: Dmand AI Professional Profile Data

Sources for Dr. Warren J. Gasper's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Clinical trials and co-investigatorsDmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Warren J. Gasper

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. Warren J. Gasper's NPI number?

Dr. Warren J. Gasper's NPI number is 1427186212. It was assigned on March 1, 2007, and it is active in the NPI Registry.

What kind of doctor is Dr. Warren J. Gasper?

Dr. Warren J. Gasper is a general surgeon in San Francisco, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).

Where does Dr. Warren J. Gasper practice?

Dr. Gasper practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Gasper's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. Dmand AI also links Dr. Gasper to 5 group practices and clinics and 5 medical groups.

What is Dr. Warren J. Gasper's office phone number?

The practice phone on file for Dr. Gasper is (415) 353-2733.

What is Dr. Warren J. Gasper's medical license number?

Dr. Gasper holds California license A89802.

Which hospitals is Dr. Warren J. Gasper affiliated with?

Dr. Gasper practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.

What medical group is Dr. Warren J. Gasper part of?

Dr. Gasper is linked to UCSF Pediatrics. Dmand AI links Dr. Gasper to 5 more medical groups.

Does Dr. Warren J. Gasper accept Medicare?

Yes. CMS data shows Dr. Gasper billed Medicare for 771 services in 2024, and Dr. Gasper accepts Medicare assignment.

Does Dr. Warren J. Gasper offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Gasper as offering telehealth services.

What is Dr. Warren J. Gasper's MIPS score?

Dr. Gasper's MIPS final score for performance year 2024 is 98 out of 100, reported as part of a group.

Show 7 more questionsShow fewer questions

How many Medicare patients does Dr. Warren J. Gasper see?

CMS counts 417 Medicare patients who saw Dr. Gasper in 2024, with an average age of 75.

What services does Dr. Warren J. Gasper bill to Medicare?

In 2024, Dr. Gasper's most billed Medicare services were blood vessel study (93923), blood vessel study (93925) and blood vessel study (93970).

Where did Dr. Warren J. Gasper go to medical school?

Dr. Gasper graduated from University of Maryland School of Medicine in 2003.

Has Dr. Warren J. Gasper received payments from drug or device companies?

CMS Open Payments shows $17,434 in general payments to Dr. Gasper from 18 companies from 2016 to 2025. The largest total came from Provisio Medical.

How long has Dr. Warren J. Gasper been practicing?

Dr. Gasper graduated from medical school in 2003, 23 years ago.

Does Dr. Warren J. Gasper do research?

Dmand AI links 100 publications to Dr. Gasper, published from 2007 to 2025. Dr. Gasper has worked on 9 clinical trials.

Who does Dr. Warren J. Gasper publish with?

Dr. Gasper's most frequent co-authors are Michael Salvatore Conte, MD (28 shared papers), Andres Schanzer, MD (21 shared papers) and Adam Beck, MD (20 shared papers).

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