Frank Efrem Primus, M.D.
Internal Medicine Physician · San Francisco, CA
Frank Efrem Primus, M.D. is an internal medicine physician with a practice address in San Francisco, California, and NPI 1366734618, issued on May 4, 2011. Check the license (California A114110, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frank Efrem Primus
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A114110 CA
Self-reported in NPPES; status is on the state search - Practice location
- 109 S Lake Merced Hls Apt 3B, San Francisco, CA 94132
- Phone
- (773) 456-3316
- Enumerated
- May 4, 2011
- Record last updated
- Jan 29, 2026
- Medicare enrollment
- Enrolled (PECOS I20240814002379); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Frank Efrem Primus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114110Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
12 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 0% 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.
Bills Medicare through 4 group practices
- Crescent Wound Care IncModesto, CA
- HC California PCSonora, CA
- Izuchukwu Okpara MD IncValencia, CA
- Wound Docs ApcLong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frank Efrem Primus among 17,696 internal medicine physician records in California
Frank Efrem Primus, M.D. 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 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2008 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 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
- Alishba Ata, DOSan Francisco, CA 941321053873711
- Lawrence Chao, M.D.San Francisco, CA 941321700896370
- Francis Charlton, M.D.San Francisco, CA 941321548339104
- Charles Delatore, M.D.San Francisco, CA 941321679560478
- Justin Fong, M.D.San Francisco, CA 941321841346608
- Andrew Hooker, MDSan Francisco, CA 941321922628114
- Robert Molino, MDSan Francisco, CA 941321407815673
- Robert Napoles, MDSan Francisco, CA 941321700986544
Common questions
What is Frank Efrem Primus, M.D.'s NPI number?
Frank Efrem Primus, M.D.'s National Provider Identifier (NPI) is 1366734618, issued on May 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Frank Efrem Primus, M.D. located?
The NPPES record lists a practice address at 109 S Lake Merced Hls Apt 3B, San Francisco, CA, 94132. Phone: (773) 456-3316. Providers update this record themselves, so call before visiting.
How can I verify Frank Efrem Primus, M.D.'s license?
NPPES lists California license number A114110, 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 Frank Efrem Primus, M.D. prescribe under Medicare Part D?
In 2024, Frank Efrem Primus, M.D. had 12 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.