Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William Doel Marrero-Leon, MD

Individual provider Hematology (Internal Medicine) Physician · NPI 1336688274

William Doel Marrero-Leon, MD is a Medical Oncology in Houston, Texas. Qualified in 2009, 17 years ago. Works from 2 locations. Licensed in Texas.

Years since qualifying
17
Licensed in
TX
In the registry since
2017
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1515 Holcombe Blvd
Houston, TX 77030-4000
Phone: (713) 792-6161
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • San Juan, San Juan, PR 00935-1609 — (787) 777-3535

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence V7258 (TX)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence V7258 (TX)
Internal Medicine Physician Taxonomy 207R00000X · Licence V7258 (TX)

Record details

NPI number1336688274
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 13, 2017
Last updated in NPPESApril 14, 2026
Certification dateApril 14, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

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