James Slack, M.D.
NPI 1841273588 · Hematology & Oncology Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Hematopoietic Cell Transplantation and Cellular Therapy · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Slack, M.D. is a Hematology & Oncology Physician provider in Phoenix, AZ (NPI 1841273588).
Provider details
- NPI number
- 1841273588
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 31866 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
335 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 151 | $63 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 59 | $93 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 47 | $73 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 30 | $174 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 26 | $138 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Acyclovir | 61 | 13 |
| Venetoclaxbrand: Venclexta | 36 | — |
| Allopurinol | 27 | 11 |
| Levofloxacin | 24 | — |
| Lenalidomidebrand: Revlimid | 22 | — |
| Imatinib Mesylate | 15 | — |
| Apixabanbrand: Eliquis | 12 | — |
| Belumosudil Mesylate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$66 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-28
- Last updated
- 2021-10-19
- Certified
- 2021-10-19
Frequently asked questions
- What is James Slack's NPI number?
- James Slack's National Provider Identifier (NPI) is 1841273588, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Slack's specialty?
- James Slack is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is James Slack located?
- James Slack's practice location on file with NPPES is 5777 E Mayo Blvd, Phoenix, AZ 85054-4502.
- What is James Slack's phone number?
- The practice phone number listed in the NPPES registry for James Slack is (480) 301-8000.
- Does James Slack accept Medicare?
- James Slack is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Slack's NPI active?
- Yes — James Slack's NPI (1841273588) is active in the NPPES registry as of the last update on 2021-10-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.