Allison Alden Merz-Herrala, MD
Obstetrics & Gynecology Physician · San Francisco, CA
Allison Alden Merz-Herrala, MD is an obstetrics & gynecology physician with a practice address in San Francisco, California, and NPI 1770112492, issued on Apr 4, 2020. Check the license (California A185547, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allison Alden Merz-Herrala
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A185547 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1001 Potrero Ave Bldg 5, San Francisco, CA 94110
- Phone
- (628) 206-3409
- Enumerated
- Apr 4, 2020
- Record last updated
- Jul 23, 2024
- Fax
- (415) 206-3112
- Medicare enrollment
- Enrolled (PECOS I20240802003309); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2020
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1001 Potrero Ave Bldg 5
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mary Aiello, MAStudent in an Organized Health Care Education/Training Program1437934742
- Tatiana Baquero DevisClinical Social Worker1922842400
- Jack Buchanan, MD, PHDPsychiatry Physician1093343014
- Jon Farrell, ASWCommunity Health Worker1366118390
- Sheiphali Gandhi, M.D.Preventive Medicine/Occupational Environmental Medicine Physician1255692752
- Amanda Halpin, RN, NP, IBCLCAdult Health Nurse Practitioner1972875706
Verify Allison Alden Merz-Herrala in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A185547Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- 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).
Allison Alden Merz-Herrala among 5,088 obstetrics & gynecology physician records in California
Allison Alden Merz-Herrala, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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 94% of them.
- NPI issued2020 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2020 · median 2004 among the 2,700 with a school on file
- Record last updated2024 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in San Francisco → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Yamilee Bermingham, M.D.San Francisco, CA 941101013937127
- Deborah Cohan, MDSan Francisco, CA 941101831143221
- Craig Cohen, MDSan Francisco, CA 941101306889613
- Teresa Depineres, MDSan Francisco, CA 941101205880796
- Eleanor Drey, MDSan Francisco, CA 941101942254438
- Rebecca Jackson, MDSan Francisco, CA 941101699729640
- Vanessa Jacoby, MDSan Francisco, CA 941101154363778
- Barbara Nicol, M.D.San Francisco, CA 941101710907811
Common questions
What is Allison Alden Merz-Herrala, MD's NPI number?
Allison Alden Merz-Herrala, MD's National Provider Identifier (NPI) is 1770112492, issued on Apr 4, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Allison Alden Merz-Herrala, MD located?
The NPPES record lists a practice address at 1001 Potrero Ave Bldg 5, San Francisco, CA, 94110. Phone: (628) 206-3409. Providers update this record themselves, so call before visiting.
How can I verify Allison Alden Merz-Herrala, MD's license?
NPPES lists California license number A185547, 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.
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.