Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Daniel Isaac, DO

Individual provider Internal Medicine Physician · NPI 1326486416

Daniel Isaac, DO practises Hematology/Oncology in Grand Rapids, Michigan. Qualified in 2013, 13 years ago. Practices with McLaren Greater Lansing, a 96-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
13
Licensed in
MI
In the registry since
2013
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

145 Michigan St NE Ste 2200
Grand Rapids, MI 49503-2562
Phone: (616) 486-5933
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3520 Forest Rd, Lansing, MI 48910-3720 — (517) 975-9500

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 5101020392 (MI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 5101020392 (MI)

Record details

NPI number1326486416
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 11, 2013
Last updated in NPPESMarch 12, 2026
Certification dateMarch 12, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice McLaren Greater Lansing — 96 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients189
Services billed 389 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at McLaren Greater Lansing

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 96 clinicians in the practice; 12 are shown here.

Other providers in Grand Rapids