Calvin S. So, MD
Allergy & Immunology Physician · San Francisco, CA
Calvin S. So, MD is an allergy & immunology physician with a practice address in San Francisco, California, and NPI 1629156229, issued on Nov 1, 2006. Check the license (California A78667, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Calvin S. So
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- A78667 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2200 Ofarrell St, San Francisco, CA 94115
- Phone
- (415) 833-2000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A786670 CA
- Medicare enrollment
- Enrolled (PECOS I20060105000886); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2000
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 2200 Ofarrell St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mitchell Adachi, MDAnatomic Pathology Physician1720166366
- Lesley Aiken, MDInternal Medicine Physician1629156120
- Jonathan Alexander, MDHospitalist Physician1811075450
- Gabull Alhadhrami, NPAcute Care Nurse Practitioner1427124098
- Bryan Andrews, MDAnesthesiology Physician1609954239
Verify Calvin S. So in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A78667Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3% more Medicare Part D claims than the average allergy & immunology physician in 2024
760 Medicare Part D claims for 165 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Azelastine Hcl126 claims
- Albuterol Sulfate Hfa86 claims
- Spiriva Respimat80 claims
- Fluticasone Propionate67 claims
- Breyna60 claims
- Montelukast Sodium54 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Calvin S. So among 444 allergy & immunology physician records in California
Calvin S. So, MD 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2000 · median 2004 among the 281 with a school on file
- Record last updated2021 · 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
- Faith Bocobo, MDSan Francisco, CA 941151669550265
- James Chen, DOSan Francisco, CA 941211891870119
- Avraham Giannini, MDSan Francisco, CA 941091639192719
- Susan Kim, MDSan Francisco, CA 941211114160405
- Katharine Fast, M.D.San Francisco, CA 941081275720484
- Opal Gupta, MDSan Francisco, CA 941081760724371
- Rebecca Vanlandingham, MDSan Francisco, CA 941081851465173
- Jeffrey Davidson, M.D.San Francisco, CA 941041295792497
Common questions
What is Calvin S. So, MD's NPI number?
Calvin S. So, MD's National Provider Identifier (NPI) is 1629156229, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Calvin S. So, MD located?
The NPPES record lists a practice address at 2200 Ofarrell St, San Francisco, CA, 94115. Phone: (415) 833-2000. Providers update this record themselves, so call before visiting.
How can I verify Calvin S. So, MD's license?
NPPES lists California license number A78667, 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 Calvin S. So, MD prescribe under Medicare Part D?
In 2024, Calvin S. So, MD had 760 Medicare Part D claims for 165 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.