Daniel Isaac, D.O.
NPI 1326486416 · Hematology & Oncology Physician · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel Isaac, D.O. is a Hematology & Oncology Physician provider in Grand Rapids, MI (NPI 1326486416).
Provider details
- NPI number
- 1326486416
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 5101020392 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
351 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 204 | $98 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 117 | $66 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 18 | $135 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 12 | $133 |
Typical Medicare-allowed amounts for these services range $66–$135 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 102 | 37 |
| Enzalutamidebrand: Xtandi | 82 | 14 |
| Abiraterone Acetate | 55 | 13 |
| Letrozole | 49 | 14 |
| Prednisone | 40 | 17 |
| Ibrutinibbrand: Imbruvica | 34 | — |
| Lenalidomidebrand: Revlimid | 24 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,451 across 2 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
Additional practice locations (1)
- 3520 Forest RdLansing, MI 48910-3720Phone: (517) 975-9500Fax: (517) 975-9520
Registry dates
- Enumerated
- 2013-06-11
- Last updated
- 2026-03-12
- Certified
- 2026-03-12
Frequently asked questions
- What is Daniel Isaac's NPI number?
- Daniel Isaac's National Provider Identifier (NPI) is 1326486416, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel Isaac's specialty?
- Daniel Isaac is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel Isaac located?
- Daniel Isaac's practice location on file with NPPES is 145 Michigan St Ne Ste 2200, Grand Rapids, MI 49503-2562.
- What is Daniel Isaac's phone number?
- The practice phone number listed in the NPPES registry for Daniel Isaac is (616) 486-5933.
- Does Daniel Isaac accept Medicare?
- Daniel Isaac is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel Isaac's NPI active?
- Yes — Daniel Isaac's NPI (1326486416) is active in the NPPES registry as of the last update on 2026-03-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.