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

Dr. Isaac Pak, DO

Individual provider Nephrology Physician · NPI 1497249791

Dr. Isaac Pak, DO is registered under Critical Care (Intensivists) in Valhalla, New York. Graduated from Pacific NW Un of Hs, Col of Osteopathic Medicine in 2018, 8 years ago. Practices with John T Mather Memorial Hospital, a 180-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
8
Trained at
Pacific NW Un of Hs, Col of Osteopathic Medicine
Licensed in
NY
In the registry since
2018
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

100 Woods Rd
Valhalla, NY 10595-1530
Phone: (914) 493-7000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 707 E Main St, Middletown, NY 10940-2650 — (845) 333-6333
  • 75 N Country Rd, Port Jefferson, NY 11777-2119 — (631) 473-1320

Specialties & licences

Critical Care Medicine (Internal Medicine) Physician (primary) Taxonomy 207RC0200X · Licence 324740 (NY)
Nephrology Physician Taxonomy 207RN0300X · Licence 324740 (NY)

Record details

NPI number1497249791
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 20, 2018
Last updated in NPPESMay 13, 2024
Certification dateMay 13, 2024

Medicare enrollment

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

Medicare specialtyCRITICAL CARE (INTENSIVISTS)
Medical schoolPACIFIC NW UN OF HS, COL OF OSTEOPATHIC MEDICINE
Graduated 2018 (8 years in practice)
Group practice John T Mather Memorial Hospital — 180 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients90
Services billed 201 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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.

Colleagues at John T Mather Memorial Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 180 clinicians in the practice; 12 are shown here.

Other providers in Valhalla