James L. Slack, M.D.
Hematology & Oncology Physician · Phoenix, AZ
James L. Slack, M.D. is a hematology & oncology physician with a practice address in Phoenix, Arizona, and NPI 1841273588, issued on Nov 28, 2005. Check the license (Arizona 31866, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- James L. Slack
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 31866 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 5777 E Mayo Blvd, Phoenix, AZ 85054
- Phone
- (480) 301-8000
- Enumerated
- Nov 28, 2005
- Record last updated
- Oct 19, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100126000275); accepts Medicare assignment
- Medical or professional school
- University Of New Mexico School Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 285 in Arizona → Look up another NPI →
Also registered at 5777 E Mayo Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Oluseyi AbidoyeHematology & Oncology Physician1780211029
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- Maria Aguilar, MDNeurology Physician1518924190
- Sophia Aguirre, MDEmergency Medicine Physician1285384859
- Erin Alexander, MS, MSGenetic Counselor (M.S.)1487541595
- Nneoma Alozie, MDInternal Medicine Physician1912642695
Verify James L. Slack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 31866Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
52% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
417 Medicare Part D claims for 45 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 33% of claims.
Most prescribed
- Acyclovir61 claims
- Venclexta36 claims
- Allopurinol27 claims
- Levofloxacin24 claims
- Revlimid22 claims
- Imatinib Mesylate15 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 67.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $65.93
3 payments; by number, the most common kind was food and beverage; the largest payer was Celgene Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- HonorhealthScottsdale, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James L. Slack among 285 hematology & oncology physician records in Arizona
James L. Slack, M.D. is one of 285 hematology & oncology physician records with a practice address in Arizona. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated1983 · median 2003 among the 229 with a school on file
- Record last updated2021 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Arizona
There are 285 hematology & oncology physician records in Arizona.
All 285 in Arizona → Every provider in Phoenix → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Oluseyi AbidoyePhoenix, AZ 850541780211029
- Rodolfo Garza Morales, MDPhoenix, AZ 850541952921413
- Talal Hilal, M.D.Phoenix, AZ 850541669813978
- Gregory Mayer, M.D.Phoenix, AZ 850541881678191
- Donald Northfelt, M.D.Phoenix, AZ 850541316922008
- Craig Reeder, M.D.Phoenix, AZ 850541134102536
- Mahesh Seetharam, MD, FACPPhoenix, AZ 850541487781175
- Tania Cortas, MDPhoenix, AZ 850281720293608
Common questions
What is James L. Slack, M.D.'s NPI number?
James L. Slack, M.D.'s National Provider Identifier (NPI) is 1841273588, issued on Nov 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James L. Slack, M.D. located?
The NPPES record lists a practice address at 5777 E Mayo Blvd, Phoenix, AZ, 85054. Phone: (480) 301-8000. Providers update this record themselves, so call before visiting.
How can I verify James L. Slack, M.D.'s license?
NPPES lists Arizona license number 31866, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James L. Slack, M.D. prescribe under Medicare Part D?
In 2024, James L. Slack, M.D. had 417 Medicare Part D claims for 45 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is James L. Slack, M.D.'s MIPS final score?
The 2023 MIPS final score is 67.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.