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RUTH SIEW M.D.
NPI 1255674479
Pediatrics - Pediatric Pulmonology in San Francisco, CA

Active since April 05, 2013PECOS Enrolled
1825 4TH ST FL 6, SAN FRANCISCO, CA 94143(415) 353-7337 Get Directions Write a Review

NPPES record last updated: July 8, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 8, 2022, Nov 8, 2016 (2 updates tracked since 2016).

About Ruth Siew M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

RUTH SIEW M.D. (NPI 1255674479) is an individual pediatric pulmonology provider in San Francisco, California, licensed in California (A132946) and active in the NPI registry since April 2013. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1255674479
Entity TypeIndividualFemale
Primary Taxonomy2080P0214X
Provider Legal NameRUTH SIEWCredential: M.D.
Location Address1825 4TH ST FL 6San Francisco, CA 94143-2350
Mailing Address1825 4th St Fl 6San Francisco, CA 94143-2350 · (415) 353-7337
Phone(415) 353-7337
Sole ProprietorNo
Enumeration DateApril 5, 2013
Last NPPES UpdateJuly 8, 20222 updates tracked since enumeration
NPPES CertifiedJuly 8, 2022
✔ NPI 1255674479 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Pediatric PulmonologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0214X
License✔ Licensed in CA · A132946
Definition
A pediatrician dedicated to the prevention and treatment of all respiratory diseases affecting infants, children and young adults. This specialist is knowledgeable about the growth and development of the lung, assessment of respiratory function in infants and children, and experienced in a variety of invasive and noninvasive diagnostic techniques.
Also ListedPediatricsTaxonomy 208000000X · License A132946 (CA)
1825 4TH ST FL 6, San Francisco, CA 94143
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ruth Siew M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Ruth Siew reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ucsf Pediatrics Associates
3.7 mi
Pediatrics
505 PARNASSUS AVE
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 1,159 clinicians in this Medicare group
NPI 1376614016 (415) 353-2000
University Of California San Francisco
3.7 mi
Surgery
400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1346329380 (415) 353-2161
Ucsf Medical Group Business Services
3.7 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MISS FEDNA MORENCY P.A.-C, ATC
Physician Assistant (Surgical)
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 885-3800
DR. RANDEEP KAUR BRAR M.D.
Medical Genetics (Clinical Genetics (M.D.))
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-2757
IRENE JOAN CHANG M.D.
Medical Genetics (Clinical Genetics (M.D.))
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-2757
STEPHANIE CHAM M.D.
Obstetrics & Gynecology (Gynecologic Oncology)
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-9600
MONICA PENON PORTMANN MD
Pediatrics
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-2757
HANNAH CHESSER M.D.
Pediatrics (Pediatric Endocrinology)
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-7337
REVA FRANKEL MD
Medical Genetics (Clinical Genetics (M.D.))
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-2757
MISS CARMEN KAI MAN TSE R.D.
Dietitian, Registered (Nutrition, Pediatric)
1825 4TH ST FL 6
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-2813

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ruth Siew's NPI number?

The NPI number for Ruth Siew is 1255674479. It was assigned to this individual provider in the NPPES registry on April 5, 2013.

Where is Ruth Siew located?

Ruth Siew practices at 1825 4th St Fl 6, San Francisco, CA 94143. The listed phone number is (415) 353-7337.

What is Ruth Siew's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Pulmonology, with taxonomy code 2080P0214X.

Is Ruth Siew enrolled in Medicare?

Yes. Ruth Siew is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ruth Siew's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ruth Siew reassigns Medicare benefits to 3 organizations: Ucsf Pediatrics Associates (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ruth Siew's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ruth Siew was last updated on July 8, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.