JEFFREY ROBERT MERZ-HERRALA MD
NPI 1619505120
Emergency Medicine in San Francisco, CA
About Jeffrey Robert Merz-herrala Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JEFFREY ROBERT MERZ-HERRALA MD (NPI 1619505120) is an individual emergency medicine provider in San Francisco, California, licensed in California (A184839) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Harvard Medical School (2020).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 2
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
Jeffrey Robert Merz-herrala Md 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
6Medicare enrollment records show Jeffrey Merz-herrala reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94107
- Reassigned Medicare billing, California enrollment
- 1,573 clinicians in this Medicare group
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 842 clinicians in this Medicare group
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 723 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94143 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 9
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 Jeffrey Merz-herrala's NPI number?
The NPI number for Jeffrey Merz-herrala is 1619505120. It was assigned to this individual provider in the NPPES registry on March 30, 2020. The provider is also known as Jeffrey Robert Herrala.
Where is Jeffrey Merz-herrala located?
Jeffrey Merz-herrala practices at 520 Illinois St, San Francisco, CA 94143. The listed phone number is (415) 353-9188.
What is Jeffrey Merz-herrala's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Jeffrey Merz-herrala enrolled in Medicare?
Yes. Jeffrey Merz-herrala 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 Jeffrey Merz-herrala's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jeffrey Merz-herrala reassigns Medicare benefits to 6 organizations: City & County Of San Francisco (San Francisco, CA), University Of California Sfgh Medical Group (San Francisco, CA), Permanente Medical Group Inc (San Francisco, CA), University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and 1 more organization, 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 Jeffrey Merz-herrala'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 Jeffrey Merz-herrala was last updated on September 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Jeffrey Robert Merz-Herrala, MD · NPI 1619505120
Emergency Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since March 30, 2020.
## Identity
- **NPI:** 1619505120 (Entity type: Individual)
- **Enumerated:** March 30, 2020
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A184839 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 520 ILLINOIS ST, San Francisco, CA 94143-2501
- **Phone:** (415) 353-9188
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): City & County Of San Francisco (NPI 1013879139, San Francisco, CA); University Of California Sfgh Medical Group (NPI 1174598296, San Francisco, CA); Permanente Medical Group Inc (NPI 1841373800, San Francisco, CA); University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2020
## Record status
- **NPPES last updated:** September 23, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1619505120) · Data from the CMS NPPES public registry.