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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

HAROLD NATHAN TAN MD
NPI 1013887728
Internal Medicine - Medical Oncology in Houston, TX

Active since November 07, 2025
1515 HOLCOMBE BLVD, HOUSTON, TX 77030(713) 792-6161 Get Directions Write a Review

NPPES record last updated: September 1, 2026. Verified against the NPPES registry weekly; last sync: September 20, 2026.

Record update history: Sep 1, 2026, Nov 7, 2025 (2 updates tracked since 2025).

About Harold Nathan Tan Md NPPES

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

HAROLD NATHAN TAN MD (NPI 1013887728) is an individual medical oncology provider in Houston, Texas, licensed in Texas (49042) and active in the NPI registry since November 2025.

NPPES Registry Identity

NPI1013887728
Entity TypeIndividualMale
Primary Taxonomy207RX0202X
Provider Legal NameHAROLD NATHAN TANCredential: MD
Location Address1515 HOLCOMBE BLVDHouston, TX 77030-4000
Mailing AddressPo Box 4439Houston, TX 77210-4439 · (713) 792-2991 · Fax (713) 745-1782
Phone(713) 792-6161
Sole ProprietorNo
Enumeration DateNovember 7, 2025
Last NPPES UpdateSeptember 1, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 1, 2026
✔ NPI 1013887728 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in TX · 49042
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
Also ListedInternal MedicineTaxonomy 207R00000X · License 49042 (TX)
1515 HOLCOMBE BLVD, Houston, TX 77030
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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.

DR. MERRY CHEN MD
Psychiatry & Neurology (Neurology)
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-6161
AMEENA BAGREE MALHOTRA M.D.
Internal Medicine (Nephrology)
1515 HOLCOMBE BLVD, 77030-4009
HOUSTON, TX 77030
Harris County (713) 792-6161
SOLANGE ERLYN COX MD
Surgery
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-2360
DR. BRYAN KEITH GUILLORY M.D.
Pathology (Anatomic Pathology & Clinical Pathology)
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-6161
JANUARY Y TSAI MD
Anesthesiology
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-6161
DR. SUNYOUNG LEE MD
Internal Medicine (Medical Oncology)
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-6161
MRS. RACHEL KRAMER FUTRELL PA-C
Physician Assistant
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-6161
MEGAN J TANNER NP-C
Nurse Practitioner
1515 HOLCOMBE BLVD
HOUSTON, TX 77030
Harris County (713) 792-6161

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 Harold Nathan Tan's NPI number?

The NPI number for Harold Nathan Tan is 1013887728. It was assigned to this individual provider in the NPPES registry on November 7, 2025.

Where is Harold Nathan Tan located?

Harold Nathan Tan practices at 1515 Holcombe Blvd, Houston, TX 77030. The listed phone number is (713) 792-6161.

What is Harold Nathan Tan's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

When was this NPI record last updated?

The NPPES record for Harold Nathan Tan was last updated on September 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 days 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.