Jeffrey Robert Merz-Herrala, MD
Emergency Medicine Physician · San Francisco, CA
Jeffrey Robert Merz-Herrala, MD is an emergency medicine physician with a practice address in San Francisco, California, and NPI 1619505120, issued on Mar 30, 2020. Check the license (California A184839, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jeffrey Robert Merz-Herrala
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A184839 CA
Self-reported in NPPES; status is on the state search - Practice location
- 520 Illinois St, San Francisco, CA 94143
- Phone
- (415) 353-9188
- Enumerated
- Mar 30, 2020
- Record last updated
- Sep 23, 2025
- Medicare enrollment
- Enrolled (PECOS I20231114002791); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 520 Illinois St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ada Edwards, NPFamily Nurse Practitioner1053869073
- Ixel GarciaPhysical Therapist1417831850
- Sagar Kadakia, DOFamily Medicine Physician1154909240
- Jirayut Latthivongskorn, MD, MPHFamily Medicine Physician1508422403
- James Radford, DO, DCFamily Medicine Physician1023188026
- Natalie Rosekrans, DPTPhysical Therapist1609707132
Verify Jeffrey Robert Merz-Herrala in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A184839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average emergency medicine physician in 2024
79 Medicare Part D claims for 49 beneficiaries, against an average of 226 among the 54,106 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.
Industry payments in 2024: $29.73
1 payment: food and beverage; the largest payer was TerSera Therapeutics LLC. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 4 group practices
- Permanente Medical Group IncSan Leandro, CA
- University Anesthesia Medical GroupSan Francisco, CA
- University OF California San FranciscoSan Francisco, CA
- University OF California Sfgh Medical GroupSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jeffrey Robert Merz-Herrala among 7,751 emergency medicine physician records in California
Jeffrey Robert Merz-Herrala, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 88% of them.
- NPI issued2020 · 88% of these records are older, 8% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2020 · median 2011 among the 4,560 with a school on file
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Francisco → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Michael Burg, MDSan Francisco, CA 941431497713150
- Laura Catena, MDSan Francisco, CA 941431225089568
- Christopher Fee, MDSan Francisco, CA 941431992762207
- Susan Lambe, MDSan Francisco, CA 941431588628598
- Matthew Lewin, MD, PHDSan Francisco, CA 941431043269277
- Daniel McDermott, MDSan Francisco, CA 941431316996556
- Jay Menaker, M.D.San Francisco, CA 941431568437176
- Lance Montauk, MDSan Francisco, CA 941431902862840
Common questions
What is Jeffrey Robert Merz-Herrala, MD's NPI number?
Jeffrey Robert Merz-Herrala, MD's National Provider Identifier (NPI) is 1619505120, issued on Mar 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey Robert Merz-Herrala, MD located?
The NPPES record lists a practice address at 520 Illinois St, San Francisco, CA, 94143. Phone: (415) 353-9188. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey Robert Merz-Herrala, MD's license?
NPPES lists California license number A184839, 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 Jeffrey Robert Merz-Herrala, MD prescribe under Medicare Part D?
In 2024, Jeffrey Robert Merz-Herrala, MD had 79 Medicare Part D claims for 49 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.