NPPES file of Aug 9, 2026

Ruth Siew, M.D.

Pediatric Pulmonology Physician · San Francisco, CA

Ruth Siew, M.D. is a pediatric pulmonology physician with a practice address in San Francisco, California, and NPI 1255674479, issued on Apr 5, 2013. Check the license (California A132946, as entered in NPPES) on the Medical Board of California; 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
1255674479
Name
Ruth Siew
Credential
M.D.
Primary taxonomy
Pediatric Pulmonology Physician 2080P0214X
License number
A132946 CA
Self-reported in NPPES; status is on the state search
Practice location
1825 4TH St FL 6, San Francisco, CA 94143
Phone
(415) 353-7337
Enumerated
Apr 5, 2013
Record last updated
Jul 8, 2022
Medicare enrollment
Enrolled (PECOS I20190927000640); accepts Medicare assignment
Medical or professional school
University Of Washington School Of Medicine, 2016
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 pediatric pulmonology physician records → All 139 in California → Look up another NPI →

Also registered at 1825 4TH St FL 6

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

  1. Shreya Agarwal, MDPediatric Hematology & Oncology Physician1841654944
  2. Hind Al Saif, MDClinical Genetics (M.D.) Physician1831403211
  3. Yu An, LCGCGenetic Counselor (M.S.)1972116937
  4. Austin Angelidakis, NPNurse Practitioner1326700287
  5. Karyn Austin, MD/PHDPediatric Cardiology Physician1639564370
  6. Serine Avagyan, MD, PHDPediatric Hematology & Oncology Physician1447540547

Verify Ruth Siew in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A132946    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
Open 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. Ucsf Pediatrics AssociatesSan Francisco, CA

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

Ruth Siew among 139 pediatric pulmonology physician records in California

Ruth Siew, M.D. is one of 139 pediatric pulmonology physician records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 72% of them.

  • NPI issued2013 · 72% of these records are older, 27% newer
  • In a Medicare fileYes · 61% of these records are
  • In the CMS Doctors and Clinicians fileYes · 32% of these records are
  • Graduated2016 · median 2006 among the 45 with a school on file
  • Record last updated2022 · 46% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0214X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pediatric Pulmonology Physician providers in California

There are 139 pediatric pulmonology physician records in California.

All 139 in California → Every provider in San Francisco → Pediatric Pulmonology Physician nationwide →

The 8 pediatric pulmonology physician records with the nearest ZIP codes

  1. Gerd Cropp, M.D.San Francisco, CA 941431851497960
  2. Janet Lim, M.D.San Francisco, CA 941431245624691
  3. Ngoc Ly, MD, MPHSan Francisco, CA 941431730113820
  4. Meghan McGarry, MDSan Francisco, CA 941431851527881
  5. Dennis Nielson, MDSan Francisco, CA 941431801850706
  6. David PanekSan Francisco, CA 941431770902637
  7. Stanford Chun, MDSan Francisco, CA 941581104385475
  8. Jenny Lin, M.D.San Francisco, CA 941581437396546

Common questions

What is Ruth Siew, M.D.'s NPI number?

Ruth Siew, M.D.'s National Provider Identifier (NPI) is 1255674479, issued on Apr 5, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Ruth Siew, M.D. located?

The NPPES record lists a practice address at 1825 4TH St FL 6, San Francisco, CA, 94143. Phone: (415) 353-7337. Providers update this record themselves, so call before visiting.

How can I verify Ruth Siew, M.D.'s license?

NPPES lists California license number A132946, 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.

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.