Daniel James Chrobak
Internal Medicine Physician · San Francisco, CA
Daniel James Chrobak is an internal medicine physician with a practice address in San Francisco, California, and NPI 1053638106, issued on Apr 29, 2010. Check the license (California A119356, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Daniel James Chrobak
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A119356 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4900 California St, San Francisco, CA 94118
- Phone
- (415) 750-9894
- Enumerated
- Apr 29, 2010
- Record last updated
- May 25, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4900 California St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lily Huang, M.D.Internal Medicine Physician1477671790
Verify Daniel James Chrobak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A119356Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
43 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Enbrel11 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.
Daniel James Chrobak among 17,696 internal medicine physician records in California
Daniel James Chrobak is one of 17,696 internal medicine 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nikola Bukurov, M.D.San Francisco, CA 941181861423279
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- Randolph Chase, M.D.San Francisco, CA 941181063428225
- Catherine Collins, M.D.San Francisco, CA 941181346265790
- Robert Dobrow, MDSan Francisco, CA 941181356336051
- Joyce Hansen, M.D.San Francisco, CA 941181639190085
- Karen Khoo, MDSan Francisco, CA 941181629031430
- Eric Kwok, M.D.San Francisco, CA 941181447231618
Common questions
What is Daniel James Chrobak's NPI number?
Daniel James Chrobak's National Provider Identifier (NPI) is 1053638106, issued on Apr 29, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Daniel James Chrobak located?
The NPPES record lists a practice address at 4900 California St, San Francisco, CA, 94118. Phone: (415) 750-9894. Providers update this record themselves, so call before visiting.
How can I verify Daniel James Chrobak's license?
NPPES lists California license number A119356, 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 Daniel James Chrobak prescribe under Medicare Part D?
In 2024, Daniel James Chrobak had 43 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.