WILLIAM DOEL MARRERO-LEON M.D
NPI 1336688274
Internal Medicine - Medical Oncology in Houston, TX
About William Doel Marrero-leon M.d NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM DOEL MARRERO-LEON M.D (NPI 1336688274) is an individual medical oncology provider in Houston, Texas, licensed in Texas (V7258) and active in the NPI registry since February 2017. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Juan, and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
William Doel Marrero-leon M.d is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show William Marrero-leon reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Houston, TX 77030
- Reassigned Medicare billing, Texas enrollment
- 2,675 clinicians in this Medicare group
Hato Rey, PR 00917
- Reassigned Medicare billing, Puerto Rico enrollment
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 77030 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
HOUSTON, TX 77030
HOUSTON, TX 77030
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 William Marrero-leon's NPI number?
The NPI number for William Marrero-leon is 1336688274. It was assigned to this individual provider in the NPPES registry on February 13, 2017.
Where is William Marrero-leon located?
William Marrero-leon practices at 1515 Holcombe Blvd, Houston, TX 77030. The listed phone number is (713) 792-6161.
What is William Marrero-leon's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is William Marrero-leon enrolled in Medicare?
Yes. William Marrero-leon is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for William Marrero-leon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Marrero-leon reassigns Medicare benefits to 2 organizations: Physicians Referral Service (Houston, TX) and Malignant Heme Alliance LLC (Hato Rey, PR). 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 William Marrero-leon'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 William Marrero-leon was last updated on April 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months 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.
# William Doel Marrero-Leon, M.D · NPI 1336688274
Medical Oncology physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since February 13, 2017.
## Identity
- **NPI:** 1336688274 (Entity type: Individual)
- **Enumerated:** February 13, 2017
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** V7258 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 1515 HOLCOMBE BLVD, Houston, TX 77030-4000
- **Phone:** (713) 792-6161
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Physicians Referral Service (NPI 1073574810, Houston, TX); Malignant Heme Alliance LLC (NPI 1760301170, Hato Rey, PR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** April 14, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1336688274) · Data from the CMS NPPES public registry.