Dr. Nancy L. Ascher, MD

  • San Francisco, CA
  • General surgeon
NPI1396799516PAC ID3779667019
Medicare services, 2024
52
Medicare patients, 2024
42
Part D claims, 2024
219
Publications
351
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
Get personal email
Mobile number
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Social profiles

Primary practice

UCSF Helen Diller Medical Center at Parnassus Heights

Hospital · San Francisco, California

See all 6 affiliations

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Dr. Nancy L. Ascher is a general surgeon in San Francisco, California

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

Dr. Ascher's NPI, 1396799516, was assigned on May 20, 2006. Dr. Ascher graduated from University Of Michigan Medical School in 1974. Dr. Ascher holds California license G63147.

NPI and contact details
Medicare PAC ID
3779667019
NPI enumeration date
May 20, 2006
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
Female
Estimated age
78
Medical school graduation
1974

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

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

Dr. Ascher'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. Nancy L. Ascher is affiliated with 3 sites of care and 3 medical groups

Dr. Ascher'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 Medical Group. Dmand AI also links Dr. Ascher to 2 more group practices and clinics and 2 medical groups, each named with a free account.

See all 6 affiliations for Dr. Ascher

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

Dmand AI tracks the EHR system at Dr. Nancy L. Ascher's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ascher practices, 3 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
+2 more sites and 2 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Nancy L. Ascher is one of 2,926 general surgeons in California

Surgery is Dr. Ascher's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Ascher's licenses on file in 2 states: California and Minnesota.

Specialties and state licenses

  • Surgery, CaliforniaPrimaryLicense G63147 · 1988 to 2026 · taxonomy 208600000X
  • Minnesota license1975 to 1988

Clinical focus

Dmand AI lists kidney transplant among the conditions Dr. Ascher treats.

General surgeons near Dr. Ascher

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. Nancy L. Ascher billed Medicare for 52 services in 2024

CMS data shows 52 Medicare services from Dr. Ascher across 2 procedure codes in 2024, for 42 Medicare patients. Medicare paid $4,685 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 202452
Medicare patients42
Paid by Medicare$4,685
Procedure codes2

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

  • 2023
  • 2024
Office and hospital visits
2023: 652024: 5220%

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

  • Dr. Ascher
  • California median
Medicare services
52vs 16669% below
Medicare patients
42vs 12165% below
Part D claims
91vs 342.7 times

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

Dr. Ascher'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. Ascher

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

Dr. Nancy L. Ascher treated 42 Medicare patients in 2024, average age 66

CMS counts 42 Medicare patients who saw Dr. Ascher in 2024. The largest group is 65 to 74, with 24 patients. 75% of them have high blood pressure, and 74% have chronic kidney disease. 48% are also on Medicaid. Their average risk score is 4.52, 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. Ascher's median patient age at 63, with 48% women.

Medicare patients, 202442
Average age66
Average risk score4.52
Also on Medicaid48%

Dr. Ascher's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Ascher's Medicare patients by sex, 2024

  • Women1843%
  • Men2457%

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

  1. High blood pressure75%
  2. Chronic kidney disease74%
  3. Diabetes71%
  4. High cholesterol71%
  5. Ischemic heart disease43%
  6. Arthritis33%
  7. Alcohol and drug use disorders31%
  8. Anxiety31%

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

Dr. Ascher's patients across all payers

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

Patient panel by age, all payers

Median age 63

Patient panel by sex, all payers

  • Women48%
  • Men51%

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

Dr. Nancy L. Ascher wrote 219 Medicare Part D claims in 2024

In 2024, Dr. Ascher wrote 219 Medicare Part D claims for 22 patients. 86% of them were for generic drugs. CMS names the drug for 91 of them, across 6 drugs with 11 or more claims each, at $985 in total drug cost. In 2023, CMS named 95 claims across 5 drugs.

Part D claims, 2024219
Drugs named by CMS6
Total drug cost$985
Part D patients22

Dr. Ascher's Part D claims by kind of drug, 2024

  • Generic189 claims86%
  • Brand-name and other30 claims14%

Dr. Ascher's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Dr. Ascher's Part D claims, 2024

  • Antibiotics9%19 of 219 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 952024: 914%

Drugs named by CMS: 6 in 2024, 5 in 2023.

See all prescribing by Dr. Ascher

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Nancy L. Ascher 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. Ascher for performance year 2024, reported as part of a group. Dr. Ascher accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ascher as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Dr. Ascher'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.

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

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Dr. Nancy L. Ascher has 351 publications on record

Dmand AI links 351 papers to Dr. Ascher, published from 2001 to 2024. 2021 was the busiest year, with 9. The most frequent topics are Liver Transplantation, Graft Rejection and Kidney Transplantation. Dr. Ascher has published most often in Transplantation. Dr. Ascher's most frequent co-authors are Peter G. Stock, MD, John P. Roberts, MD and Chris E. Freise, MD.

Papers351
Years published2001 to 2024

Dr. Ascher's papers by year, 2015 to 2024

Topics Dr. Ascher writes about most

  • Liver Transplantation
  • Graft Rejection
  • Kidney Transplantation
  • Graft Survival
  • Transplantation, Homologous
  • Liver
  • Postoperative Complications
  • Tissue Donors

Dr. Ascher's most frequent co-authors

Recent publications by Dr. Ascher

See all 351 publications and co-authors

See who Dr. Ascher researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ascher 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. Nancy L. Ascher received $444 in industry payments from 2016 to 2019

CMS Open Payments shows 2 general payments to Dr. Ascher from 2 drug and device companies from 2016 to 2019. Travel and lodging make up the largest share, 89% of the total. One Lambda, Inc. paid the most, $397.

General payments to Dr. Ascher by program year, 2016 to 2019

General payments to Dr. Ascher by kind, 2016 to 2019

$444in total
  • Travel and lodging$39789%
  • Food and beverage$4811%

Companies that paid Dr. Ascher the most, 2016 to 2019

Share is of all general payments to this clinician.

See all payments to Dr. Ascher

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

Dr. Nancy L. Ascher has 6 awards and honors on record

Dmand AI lists 6 awards for Dr. Ascher, most recently America's Top Doctors in 2014.

Awards and honors for Dr. Ascher

  1. 2014
    • America's Top Doctors
  2. 2013
    • ACS Fellow
  3. 2001
    • IOM Elected Member
  4. Undated
    • CMS Stage 1 EHR
    • Super Doc
    • Whos Who

Source: Dmand AI Professional Profile Data

Dr. Nancy L. Ascher graduated from University Of Michigan Medical School

Dr. Ascher graduated from University Of Michigan Medical School in 1974. Dr. Ascher is a member of ACS.

  1. Medical schoolUniversity Of Michigan Medical School

Source: Dmand AI Professional Profile Data

Dr. Nancy L. Ascher accepts plans from 10 insurance carriers

Dr. Ascher is in network with 10 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.

  • Aetna
  • Elevance
  • Blue Cross Blue Shield of Michigan
  • Blue Cross Blue Shield of Massachusetts
  • HCSC
  • Regence Health Plans
  • United Healthcare
  • Blue Cross and Blue Shield of Kansas City
  • +2 more carriersWith a free account

Plan types Dr. Ascher accepts, by number of carriers

  1. Medicare8
  2. PPO6
  3. HMO4
  4. POS4
  5. EPO3

Source: Dmand AI Insurance Network Data

Sources for Dr. Nancy L. Ascher'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)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - 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)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network 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. Nancy L. Ascher

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. Nancy L. Ascher's NPI number?

Dr. Nancy L. Ascher's NPI number is 1396799516. It was assigned on May 20, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. Nancy L. Ascher?

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

Where does Dr. Nancy L. Ascher practice?

Dr. Ascher practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Ascher'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. Ascher to 2 group practices and clinics and 2 medical groups.

What is Dr. Nancy L. Ascher's office phone number?

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

What is Dr. Nancy L. Ascher's medical license number?

Dr. Ascher holds California license G63147, one of the licenses on file in 2 states.

Which states has Dr. Nancy L. Ascher been licensed in?

Dmand AI has state licenses on file for Dr. Ascher in California (1988 to 2026) and Minnesota (1975 to 1988).

Which hospitals is Dr. Nancy L. Ascher affiliated with?

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

What medical group is Dr. Nancy L. Ascher part of?

Dr. Ascher is linked to UCSF Medical Group. Dmand AI links Dr. Ascher to 2 more medical groups.

Does Dr. Nancy L. Ascher accept Medicare?

Yes. CMS data shows Dr. Ascher billed Medicare for 52 services in 2024, and Dr. Ascher accepts Medicare assignment.

Does Dr. Nancy L. Ascher offer telehealth?

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

Show 10 more questionsShow fewer questions

What is Dr. Nancy L. Ascher's MIPS score?

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

How many Medicare patients does Dr. Nancy L. Ascher see?

CMS counts 42 Medicare patients who saw Dr. Ascher in 2024, with an average age of 66.

What services does Dr. Nancy L. Ascher bill to Medicare?

In 2024, Dr. Ascher's most billed Medicare services were office visit, established patient (99214) and hospital inpatient care (99233).

Where did Dr. Nancy L. Ascher go to medical school?

Dr. Ascher graduated from University Of Michigan Medical School in 1974.

What drugs does Dr. Nancy L. Ascher prescribe most?

In 2024 Medicare Part D data, Dr. Ascher's most prescribed drugs by claims were Omeprazole, Sulfamethoxazole-Trimethoprim and Prednisone.

Has Dr. Nancy L. Ascher received payments from drug or device companies?

CMS Open Payments shows $444 in general payments to Dr. Ascher from 2 companies from 2016 to 2019. The largest total came from One Lambda, Inc.

How long has Dr. Nancy L. Ascher been practicing?

Dr. Ascher graduated from medical school in 1974, 52 years ago.

Does Dr. Nancy L. Ascher do research?

Dmand AI links 351 publications to Dr. Ascher, published from 2001 to 2024.

Who does Dr. Nancy L. Ascher publish with?

Dr. Ascher's most frequent co-authors are Peter G. Stock, MD (52 shared papers), John P. Roberts, MD (45 shared papers) and Chris E. Freise, MD (39 shared papers).

What insurance does Dr. Nancy L. Ascher accept?

Dr. Ascher is in network with 10 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.

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