Nancy L. Ascher, MD
Surgery Physician · San Francisco, CA
Nancy L. Ascher, MD is a surgery physician with a practice address in San Francisco, California, and NPI 1396799516, issued on May 20, 2006. Check the license (California G63147, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nancy L. Ascher
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- G63147 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 353-1888
- Enumerated
- May 20, 2006
- Record last updated
- Jul 23, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (415) 353-8708
- Medicaid ID
- 00G631470 CA
- Medicare enrollment
- Enrolled (PECOS I20080226000532); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1974
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 3,118 in California → Look up another NPI →
Also registered at 400 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Weiyun Ai, MDMedical Oncology Physician1649346842
Verify Nancy L. Ascher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G63147Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% more Medicare Part D claims than the average surgery physician in 2024
219 Medicare Part D claims for 22 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D.
Most prescribed
- Omeprazole21 claims
- Sulfamethoxazole-Trimethoprim17 claims
- Prednisone15 claims
- Tenofovir Disoproxil Fumarate15 claims
- Clopidogrel12 claims
- Pantoprazole Sodium11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Ucsf Dept OF SurgerySan Francisco, CA
- Ucsf Medical Group Business ServicesSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy L. Ascher among 3,118 surgery physician records in California
Nancy L. Ascher, MD is one of 3,118 surgery physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated1974 · median 2003 among the 1,901 with a school on file
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in California
There are 3,118 surgery physician records in California.
All 3,118 in California → Every provider in San Francisco → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Timothy Chuter, MDSan Francisco, CA 941431023074283
- Charles Eichler, MDSan Francisco, CA 941431265498729
- Sandy Feng, MDSan Francisco, CA 941431114981594
- Chris Freise, MDSan Francisco, CA 941431194780775
- Jessica Gosnell, MDSan Francisco, CA 941431053376590
- Scott Hansen, MDSan Francisco, CA 941431548224694
- Hobart Harris, MDSan Francisco, CA 941431174587208
- Dalbhir Jangra, MDSan Francisco, CA 941431144283854
Common questions
What is Nancy L. Ascher, MD's NPI number?
Nancy L. Ascher, MD's National Provider Identifier (NPI) is 1396799516, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nancy L. Ascher, MD located?
The NPPES record lists a practice address at 400 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 353-1888. Providers update this record themselves, so call before visiting.
How can I verify Nancy L. Ascher, MD's license?
NPPES lists California license number G63147, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nancy L. Ascher, MD prescribe under Medicare Part D?
In 2024, Nancy L. Ascher, MD had 219 Medicare Part D claims for 22 beneficiaries; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
What is Nancy L. Ascher, MD's MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.