NPPES file of Aug 9, 2026

Mara Bailey-Olson, NP

Nurse Practitioner · San Francisco, CA

Mara Bailey-Olson, NP is a nurse practitioner with a practice address in San Francisco, California, and NPI 1104100692, issued on Oct 3, 2011. Check the license (California 19161, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1104100692
Name
Mara Bailey-Olson
Credential
NP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
19161 CA
Self-reported in NPPES; status is on the state search
Practice location
550 16TH St, San Francisco, CA 94143
Phone
(415) 476-2188
Enumerated
Oct 3, 2011
Record last updated
Mar 23, 2016 (not updated in 10 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20170321000805); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest nurse practitioner records → All 8,223 in California → Look up another NPI →

Also registered at 550 16TH St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Naomi Abe, M.D.Pediatric Emergency Medicine (Pediatrics) Physician1821387572
  2. Liat Bird, MDPediatrics Physician1902269087
  3. Tiffany Bittle, NNP-BCNeonatal Nurse Practitioner1073297495
  4. Julie Boiko, MDPediatric Hematology & Oncology Physician1891149506
  5. Amanda Bryson, M.D.Pediatrics Physician1912438847
  6. Maria Castellanos, M.D.Pediatrics Physician1881013795

Verify Mara Bailey-Olson in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 19161    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. University OF California San FranciscoSan Francisco, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Mara Bailey-Olson among 8,223 nurse practitioner records in California

Mara Bailey-Olson, NP is one of 8,223 nurse practitioner records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 34% of them.

  • NPI issued2011 · 34% of these records are older, 63% newer
  • In a Medicare fileYes · 65% of these records are
  • In the CMS Doctors and Clinicians fileYes · 42% of these records are
  • Graduated2009 · median 2017 among the 3,425 with a school on file
  • Record last updated2016 · 45% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Nurse Practitioner providers in California

There are 8,223 nurse practitioner records in California.

All 8,223 in California → Every provider in San Francisco → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Rosalie Bravo, RN, NPSan Francisco, CA 941431740224690
  2. Mitchel Erickson, NPSan Francisco, CA 941431851330260
  3. Caroline Farless, NPSan Francisco, CA 941431720034960
  4. Colleen Irwin, NPSan Francisco, CA 941431316984362
  5. Susan Janson, DNSCSan Francisco, CA 941431437197597
  6. Peter Knott, RN, MSNSan Francisco, CA 941431295774602
  7. Geoffrey Latham, RN, NPSan Francisco, CA 941431356395842
  8. Sarah Maclachlan, FNPSan Francisco, CA 941431972540946

Common questions

What is Mara Bailey-Olson, NP's NPI number?

Mara Bailey-Olson, NP's National Provider Identifier (NPI) is 1104100692, issued on Oct 3, 2011. An NPI identifies a provider in billing; it is not a license.

Where is Mara Bailey-Olson, NP located?

The NPPES record lists a practice address at 550 16TH St, San Francisco, CA, 94143. Phone: (415) 476-2188. Providers update this record themselves, so call before visiting.

How can I verify Mara Bailey-Olson, NP's license?

NPPES lists California license number 19161, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.