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TANJA ANDREA GRUBER MD
NPI 1457471567
Pediatrics - Pediatric Hematology-Oncology in Palo Alto, CA

Active since March 30, 2007PECOS EnrolledAccepts Medicare Assignment
725 WELCH RD, PALO ALTO, CA 94304(650) 497-8000 Get Directions Write a Review

NPPES record last updated: April 16, 2024. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Apr 16, 2024, Aug 13, 2020, Dec 7, 2017 (3 updates tracked since 2017).

About Tanja Andrea Gruber Md NPPES

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

TANJA ANDREA GRUBER MD (NPI 1457471567) is an individual pediatric hematology-oncology provider in Palo Alto, California, licensed in California (A89115) and active in the NPI registry since March 2007. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of University Of Southern California Keck School Of Medicine (2003).

NPPES Registry Identity

NPI1457471567
Entity TypeIndividualFemale
Primary Taxonomy2080P0207X
Provider Legal NameTANJA ANDREA GRUBERCredential: MD
Location Address725 WELCH RDPalo Alto, CA 94304-1601
Mailing Address262 Danny Thomas Pl # Ms 515Memphis, TN 38105-3678 · (901) 595-3006 · Fax (901) 595-3842
Phone(650) 497-8000
Sole ProprietorNo
Medical School CMSUniversity Of Southern California Keck School Of MedicineGraduated 2003
Enumeration DateMarch 30, 2007
Last NPPES UpdateApril 16, 20243 updates tracked since enumeration
NPPES CertifiedApril 16, 2024
✔ NPI 1457471567 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Pediatric Hematology-OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0207X
Licenses✔ Licensed in CA · A89115✔ Licensed in TN · 45680
Definition
A pediatrician trained in the combination of pediatrics, hematology and oncology to recognize and manage pediatric blood disorders and cancerous diseases.
Also ListedPediatricsTaxonomy 208000000X · License A89115 (CA)
725 WELCH RD, Palo Alto, CA 94304
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Secondary Practice Locations 2

Location 14650 W Sunset BlvdLos Angeles, CA 90027-6062 · Phone (323) 669-2534
Location 2262 Danny Thomas PlMemphis, TN 38105-3678 · Phone (901) 595-3300 · Fax (901) 595-3842

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Tanja Andrea Gruber Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1052553948
PECOS Enrollment IDI20200609002577
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

2

Medicare enrollment records show Tanja Gruber reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Lpch Medical Group Div Of Lucile
Same address
Children
725 WELCH RD
Palo Alto, CA 94304
  • Reassigned Medicare billing, California enrollment
  • 3,617 clinicians in this Medicare group
NPI 1417907940 (650) 498-6762
Stanford Health Care
0.2 mi
General Acute Care Hospital
300 PASTEUR DRIVE
Stanford, CA 94305
  • Reassigned Medicare billing, California enrollment
  • 4,258 clinicians in this Medicare group
NPI 1437292927 (650) 723-4000

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.

EIRI INENAGA MS, OTR/L
Occupational Therapist (Pediatrics)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8218
WENDY LEIGH ADAMS ARNP
Nurse Practitioner (Neonatal)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KEVIN WEI-HAN CHI MD
Pediatrics
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
ASHEEN RAMA MD
Anesthesiology (Pediatric Anesthesiology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
CRYSTAL LEE MACKALL MD
Pediatrics (Pediatric Hematology-Oncology)
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
KRISTI LYNNE O'CONNOR OT
Occupational Therapist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
LAUREN GENNA ROOS NP
Nurse Practitioner
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000
SHALINI MITTAL MD
Hospitalist
725 WELCH RD
PALO ALTO, CA 94304
Santa Clara County (650) 497-8000

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 Tanja Gruber's NPI number?

The NPI number for Tanja Gruber is 1457471567. It was assigned to this individual provider in the NPPES registry on March 30, 2007.

Where is Tanja Gruber located?

Tanja Gruber practices at 725 Welch Rd, Palo Alto, CA 94304. The listed phone number is (650) 497-8000.

What is Tanja Gruber's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.

Is Tanja Gruber enrolled in Medicare?

Yes. Tanja Gruber is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Tanja Gruber's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tanja Gruber reassigns Medicare benefits to 2 organizations: Lpch Medical Group Div Of Lucile (Palo Alto, CA) and Stanford Health Care (Stanford, 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 Tanja Gruber'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 Tanja Gruber was last updated on April 16, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.