James L. Slack, M.D.

NPI 1841273588ActiveIndividual· Internal Medicine, Hematology & Oncology· Phoenix, AZ

Internal Medicine, Hematology & Oncology (M.D.) in Phoenix, Arizona, trained at University of New Mexico School of Medicine (class of 1983). Their prescriptions cost Medicare Part D more than their services did: $2,011,403 for 417 claims, against $23,373 paid for services in 2024. Pfizer Inc. was the largest of 3 companies reporting payments in 2025, $62.06 in all, mostly food and beverage.

Overview

NPI	1841273588
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Nov 28, 2005
Last updated in NPPES	Oct 19, 2021
Certified by provider	Oct 19, 2021

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Hematology & Oncology Primary	207RH0003X	31866	AZ

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Nov 10, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026	No match	—
New York OMIG · Nov 11, 2026	No match	—
Ohio Medicaid · Nov 11, 2026	No match	—
Pennsylvania Medicheck · Nov 11, 2026	No match	—
Washington HCA · Nov 11, 2026	No match	—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Hematopoietic Cell Transplantation and Cellular Therapy (AZ)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	103
Services billed	842 across 16 procedure codes
Paid by Medicare	$23,373

Part D prescriptions in 2024

Prescriptions (claims)	417 · 543 30-day fills
Patients	45
Total drug cost	$2,011,403
Generic share	67% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of New Mexico School of Medicine
Graduation year	1983
Medicare specialty	Hematopoietic Cell Transplantation And Cellular Therapy
Secondary specialties	Hematology/Oncology