Cynthia Chalk
Hospitalist Physician · San Francisco, CA
Cynthia Chalk is a hospitalist physician with a practice address in San Francisco, California, and NPI 1124606900, issued on Mar 31, 2021. Check the license (California A193871, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cynthia Chalk
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A193871 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2425 Geary Blvd, San Francisco, CA 94115
- Phone
- (415) 833-2000
- Enumerated
- Mar 31, 2021
- Record last updated
- Jan 30, 2025
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 2425 Geary Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cynthia Chalk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A193871Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average hospitalist physician in 2024
92 Medicare Part D claims for 31 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
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.
Cynthia Chalk among 3,099 hospitalist physician records in California
Cynthia Chalk is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 90% of them.
- NPI issued2021 · 90% of these records are older, 6% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileNo · 81% of these records are
- Record last updated2025 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in San Francisco → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Jonathan Alexander, MDSan Francisco, CA 941151811075450
- Elizabeth Andrews, MDSan Francisco, CA 941151023196631
- Deborah Chiarucci, MDSan Francisco, CA 941151043398647
- Joel Cho, MDSan Francisco, CA 941151568541696
- Reynaldo Cordero, MDSan Francisco, CA 941151538247192
- Pam Grewall, M.D.San Francisco, CA 941151578580445
- Brian Hoberman, MDSan Francisco, CA 941151952489551
- Jinwoo Kim, MDSan Francisco, CA 941151336227974
Common questions
What is Cynthia Chalk's NPI number?
Cynthia Chalk's National Provider Identifier (NPI) is 1124606900, issued on Mar 31, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia Chalk located?
The NPPES record lists a practice address at 2425 Geary Blvd, San Francisco, CA, 94115. Phone: (415) 833-2000. Providers update this record themselves, so call before visiting.
How can I verify Cynthia Chalk's license?
NPPES lists California license number A193871, 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 Cynthia Chalk prescribe under Medicare Part D?
In 2024, Cynthia Chalk had 92 Medicare Part D claims for 31 beneficiaries; the average among hospitalist physician prescribers was 521. 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.