Isabel S. Obrien, MD, MPH
Hospice and Palliative Medicine (Emergency Medicine) Physician · San Francisco, CA
Isabel S. Obrien, MD, MPH is a hospice and palliative medicine (emergency medicine) physician with a practice address in San Francisco, California, and NPI 1386387488, issued on Apr 16, 2022. Check the license (California A202699, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Isabel S. Obrien
- Credential
- MD, MPH
- Primary taxonomy
- Hospice and Palliative Medicine (Emergency Medicine) Physician 207PH0002X
- License numbers
- A202699 CA
72964 TN
Self-reported in NPPES; status is on the state search - Practice location
- 521 Parnassus Ave, Box 0125, San Francisco, CA 94143
- Phone
- (415) 476-4838
- Enumerated
- Apr 16, 2022
- Record last updated
- Jun 17, 2025
- Medicare enrollment
- Enrolled (PECOS I20260115002100); may accept Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2022
- Entity
- Type 1 · individual
8 nearest hospice and palliative medicine (emergency medicine) physician records → All 30 in California → Look up another NPI →
Verify Isabel S. Obrien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A202699Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average hospice and palliative medicine (emergency medicine) physician in 2024
45 Medicare Part D claims for 37 beneficiaries, against an average of 194 among the 130 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.
Isabel S. Obrien among 30 hospice and palliative medicine (emergency medicine) physician records in California
Isabel S. Obrien, MD, MPH is one of 30 hospice and palliative medicine (emergency medicine) physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 97% of them.
- NPI issued2022 · 97% of these records are older, 0% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2022 · median 2012 among the 15 with a school on file
- Record last updated2025 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PH0002X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospice and Palliative Medicine (Emergency Medicine) Physician providers in California
There are 30 hospice and palliative medicine (emergency medicine) physician records in California.
All 30 in California → Every provider in San Francisco → Hospice and Palliative Medicine (Emergency Medicine) Physician nationwide →
The 8 hospice and palliative medicine (emergency medicine) physician records with the nearest ZIP codes
- Maya Nolan, MDSan Francisco, CA 941431407433584
- Brandon Perkovich, MD, MBASunnyvale, CA 940861780172288
- Robert Mueller, MDSan Mateo, CA 944021104864396
- Fredric Gough, MDFairfield, CA 945331689897019
- Megan Swan, M.D.Fremont, CA 945381194913251
- Ruth Ochoa, M.D.Oakland, CA 946061508028481
- Austin Causey, MDOakland, CA 946091659735041
- Cynthia Mackey, D.O.Lancaster, CA 935341598966053
Common questions
What is Isabel S. Obrien, MD, MPH's NPI number?
Isabel S. Obrien, MD, MPH's National Provider Identifier (NPI) is 1386387488, issued on Apr 16, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Isabel S. Obrien, MD, MPH located?
The NPPES record lists a practice address at 521 Parnassus Ave, Box 0125, San Francisco, CA, 94143. Phone: (415) 476-4838. Providers update this record themselves, so call before visiting.
How can I verify Isabel S. Obrien, MD, MPH's license?
NPPES lists California license number A202699, 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 Isabel S. Obrien, MD, MPH prescribe under Medicare Part D?
In 2024, Isabel S. Obrien, MD, MPH had 45 Medicare Part D claims for 37 beneficiaries; the average among hospice and palliative medicine (emergency medicine) physician prescribers was 194. 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.