Karin Gaensler, MD
Hematology (Internal Medicine) Physician · San Francisco, CA
Karin Gaensler, MD is a hematology (internal medicine) physician with a practice address in San Francisco, California, and NPI 1609830215, issued on Apr 12, 2006. Check the license (California G50093, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karin Gaensler
- Credential
- MD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- G50093 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 353-2421
- Enumerated
- Apr 12, 2006
- Record last updated
- Sep 22, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (415) 353-2467
- Medicaid ID
- 0G5009300 CA
- Medicare enrollment
- Enrolled (PECOS I20080225000218); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology (internal medicine) physician records → All 175 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.
- Jessica Abele, DPTPhysical Therapist1851648133
- Ian Adatia, MB CHBPediatric Cardiology Physician1427085299
- Daniel Adelman, M.D.Internal Medicine Physician1922041821
- Joshua Adler, MDInternal Medicine Physician1194781351
- Justin Ahn, M.D.Urology Physician1063755148
- Weiyun Ai, MDMedical Oncology Physician1649346842
Verify Karin Gaensler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G50093Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
208 Medicare Part D claims for 26 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
- Acyclovir35 claims
- Hydroxyurea23 claims
- Sulfamethoxazole-Trimethoprim15 claims
- Fluconazole12 claims
- Imbruvica11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 74.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- Regents OF The University OF CaliforniaSan Francisco, CA
- Ucsf Medical Group Business ServicesSan Francisco, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karin Gaensler among 175 hematology (internal medicine) physician records in California
Karin Gaensler, MD is one of 175 hematology (internal medicine) physician records with a practice address in California. 89% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 65% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated1981 · median 2006 among the 135 with a school on file
- Record last updated2016 · 34% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology (Internal Medicine) Physician providers in California
There are 175 hematology (internal medicine) physician records in California.
All 175 in California → Every provider in San Francisco → Hematology (Internal Medicine) Physician nationwide →
The 8 hematology (internal medicine) physician records with the nearest ZIP codes
- Alfred ChungSan Francisco, CA 941431417375627
- Debajyoti Datta, M.D.San Francisco, CA 941431093073090
- Annabel Frank, MDSan Francisco, CA 941431649774290
- Marina Heskel, MDSan Francisco, CA 941431184243313
- Andrew Leavitt, M.D.San Francisco, CA 941431952343113
- Gallia Levy, MD, PHDSan Francisco, CA 941431023271350
- Charles Linker, MDSan Francisco, CA 941431811951957
- Anna ParksSan Francisco, CA 941431164840757
Common questions
What is Karin Gaensler, MD's NPI number?
Karin Gaensler, MD's National Provider Identifier (NPI) is 1609830215, issued on Apr 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karin Gaensler, MD located?
The NPPES record lists a practice address at 400 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 353-2421. Providers update this record themselves, so call before visiting.
How can I verify Karin Gaensler, MD's license?
NPPES lists California license number G50093, 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 Karin Gaensler, MD prescribe under Medicare Part D?
In 2024, Karin Gaensler, MD had 208 Medicare Part D claims for 26 beneficiaries; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.
What is Karin Gaensler, MD's MIPS final score?
The 2023 MIPS final score is 74.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.