Katharine Fast, M.D.
Allergy & Immunology Physician · San Francisco, CA
Katharine Fast, M.D. is an allergy & immunology physician with a practice address in San Francisco, California, and NPI 1275720484, issued on Oct 2, 2007. Check the license (California A92138, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katharine Fast
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- A92138 CA
Self-reported in NPPES; status is on the state search - Practice location
- 450 Sutter St, San Francisco, CA 94108
- Phone
- (415) 433-7800
- Enumerated
- Oct 2, 2007
- Record last updated
- Jan 18, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (415) 433-2130
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 450 Sutter St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Katharine Fast in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A92138Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
66 Medicare Part D claims for 22 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of 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.
Industry payments in 2024: $40.26
1 payment: food and beverage; the largest payer was Abiomed. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Katharine Fast among 444 allergy & immunology physician records in California
Katharine Fast, M.D. is one of 444 allergy & immunology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 38% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2012 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in California
There are 444 allergy & immunology physician records in California.
All 444 in California → Every provider in San Francisco → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Opal Gupta, MDSan Francisco, CA 941081760724371
- Rebecca Vanlandingham, MDSan Francisco, CA 941081851465173
- Avraham Giannini, MDSan Francisco, CA 941091639192719
- Jeffrey Davidson, M.D.San Francisco, CA 941041295792497
- Benjamin Kramer, MDSan Francisco, CA 941021730559600
- Faith Bocobo, MDSan Francisco, CA 941151669550265
- Calvin So, MDSan Francisco, CA 941151629156229
- James Chen, DOSan Francisco, CA 941211891870119
Common questions
What is Katharine Fast, M.D.'s NPI number?
Katharine Fast, M.D.'s National Provider Identifier (NPI) is 1275720484, issued on Oct 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Katharine Fast, M.D. located?
The NPPES record lists a practice address at 450 Sutter St, San Francisco, CA, 94108. Phone: (415) 433-7800. Providers update this record themselves, so call before visiting.
How can I verify Katharine Fast, M.D.'s license?
NPPES lists California license number A92138, 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 Katharine Fast, M.D. prescribe under Medicare Part D?
In 2024, Katharine Fast, M.D. had 66 Medicare Part D claims for 22 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
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.