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NPISignal

Individual Healthcare Provider

Helen Ruth Nadel, MD

NPI Record: ActiveRadiology — Nuclear Radiology
NPI1750877262
Palo Alto, California

Provider's NPPES record last updated: April 8, 2024

Overview

Entity Type
Individual Healthcare Provider
NPI
1750877262
Primary Specialty
Radiology — Nuclear Radiology
Practice Location
Palo Alto, California
Sole Proprietor
No

Federal Screening

NPISignal checked this NPI against federal exclusion sources. Results below are based on the NPI number itself — an identifier match, not a name match.

List of Excluded Individuals/Entities (LEIE)

HHS Office of Inspector General

No potential match identified

No potential match was identified in NPISignal's indexed List of Excluded Individuals/Entities (LEIE) records as of 2026-09-10.

Source data
September 10, 2026
Records indexed
84,001
Screened
Sep 18, 2026, 5:18 AM UTC

This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.

SAM.gov Exclusions

U.S. General Services Administration

Not checked

SAM.gov Exclusions was not checked.

SAM.gov screening is not configured on this deployment. No SAM check has been performed.

Screened
Not checked

This is an NPI-based check only. NPISignal does not publish name-based exclusion matches on a provider profile. A shared or similar name is a lead that requires human review, not an identification, and this page is not the place to make one. Run a name-based screening below to see potential matches with the reasons for each.

This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.

Run a name-based screening

Searches OIG LEIE and SAM.gov by name and reviews every potential match.

Specialties & Taxonomies

  • Radiology

    Nuclear Radiology

    Allopathic & Osteopathic Physicians

    Primary

    A radiologist who is involved in the analysis and imaging of radionuclides and radiolabeled substances in vitro and in vivo for diagnosis and the administration of radionuclides and radiolabeled substances for the treatment of disease.

    Taxonomy code 2085N0904X
  • Radiology

    Diagnostic Radiology

    Allopathic & Osteopathic Physicians

    A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

    Taxonomy code 2085R0202X
  • Nuclear Medicine

    Allopathic & Osteopathic Physicians

    A nuclear medicine specialist employs the properties of radioactive atoms and molecules in the diagnosis and treatment of disease and in research. Radiation detection and imaging instrument systems are used to detect disease as it changes the function and metabolism of normal cells, tissues and organs. A wide variety of diseases can be found in this way, usually before the structure of the organ involved by the disease can be seen to be abnormal by any other techniques. Early detection of coronary artery disease (including acute heart attack), early cancer detection and evaluation of the effect of tumor treatment, diagnosis of infection and inflammation anywhere in the body and early detection of blood clot in the lungs are all possible with these techniques. Unique forms of radioactive molecules can attack and kill cancer cells (e.g., lymphoma, thyroid cancer) or can relieve the severe pain of cancer that has spread to bone

    Taxonomy code 207U00000X
  • Radiology

    Pediatric Radiology

    Allopathic & Osteopathic Physicians

    A radiologist who is proficient in all forms of diagnostic imaging as it pertains to the treatment of diseases in the newborn, infant, child and adolescent. This specialist has knowledge of both imaging and interventional procedures related to the care and management of diseases of children. A pediatric radiologist must be highly knowledgeable of all organ systems as they relate to growth and development, congenital malformations, diseases peculiar to infants and children and diseases that begin in childhood but cause substantial residual impairment in adulthood.

    Taxonomy code 2085P0229X

Provider-Reported License Information

Radiology (California)
C156733
Radiology (California)
C156733
Nuclear Medicine (California)
C156733
Radiology (California)
C156733
License numbers are reported by the provider to NPPES and are not independently verified by NPISignal against any state licensing board. Confirm current license status directly with the issuing state board.

Practice Locations

Practice Location

725 Welch Rd

Palo Alto, California 94304-1601

Phone: (650) 497-8000

Additional Practice Location

750 Welch Road

Room G374 Mc 5913

Stanford, California 94305-5913

Phone: (607) 379-3708

Record Information

Enumeration Date
July 9, 2018
Provider's NPPES Record Last Updated
April 8, 2024
Certification Date
April 8, 2024
NPISignal NPPES Dataset
August 2026

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