DR. FRANK EFREM PRIMUS II M.D.
NPI 1366734618
Internal Medicine in San Francisco, CA
About Dr. Frank Efrem Primus Ii M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. FRANK EFREM PRIMUS II M.D. (NPI 1366734618) is an individual internal medicine provider in San Francisco, California, licensed in California (A114110) and active in the NPI registry since May 2011. He is enrolled in Medicare PECOS and is a graduate of University Of Chicago, Pritzker School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Frank Efrem Primus Ii M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
8Medicare enrollment records show Frank Primus reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94595
- Reassigned Medicare billing, California enrollment
- 12 clinicians in this Medicare group
Modesto, CA 95350
- Reassigned Medicare billing, California enrollment
- 46 clinicians in this Medicare group
Modesto, CA 95350
- Reassigned Medicare billing, California enrollment
- 21 clinicians in this Medicare group
Sonora, CA 95370
- Reassigned Medicare billing, California enrollment
- 5 clinicians in this Medicare group
Sonora, CA 95370
- Reassigned Medicare billing, California enrollment
- 5 clinicians in this Medicare group
Valencia, CA 91355
- Reassigned Medicare billing, California enrollment
- 51 clinicians in this Medicare group
El Segundo, CA 90245
- Reassigned Medicare billing, California enrollment
- 53 clinicians in this Medicare group
Aliso Viejo, CA 92656
- Reassigned Medicare billing, California enrollment
- 23 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94132 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Frank Primus's NPI number?
The NPI number for Frank Primus is 1366734618. It was assigned to this individual provider in the NPPES registry on May 4, 2011.
Where is Frank Primus located?
Frank Primus practices at 109 S Lake Merced Hls Apt 3B, San Francisco, CA 94132. The listed phone number is (773) 456-3316.
What is Frank Primus's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Frank Primus enrolled in Medicare?
Yes. Frank Primus is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Frank Primus's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Frank Primus reassigns Medicare benefits to 8 organizations: Diana Superfin MD Inc. (Walnut Creek, CA), Crescent Wound Care Inc (Modesto, CA), Integrity Wound Physicians Inc (Modesto, CA), Hc California PC (Sonora, CA), Hickory California PC (Sonora, CA) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Frank Primus's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Frank Primus was last updated on January 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Frank Efrem Primus II, M.D. · NPI 1366734618
Internal Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since May 4, 2011.
## Identity
- **NPI:** 1366734618 (Entity type: Individual)
- **Enumerated:** May 4, 2011
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A114110 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 109 S LAKE MERCED HLS APT 3B, San Francisco, CA 94132-2923
- **Phone:** (773) 456-3316
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Diana Superfin MD Inc. (NPI 1568285880, Walnut Creek, CA); Crescent Wound Care Inc (NPI 1841920501, Modesto, CA); Integrity Wound Physicians Inc (NPI 1285409540, Modesto, CA); Hc California PC (NPI 1578369963, Sonora, CA); Hickory California PC (NPI 1194608869, Sonora, CA); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** January 29, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1366734618) · Data from the CMS NPPES public registry.