DR. ISAAC PAK DO
NPI 1497249791
Internal Medicine - Critical Care Medicine in Valhalla, NY
About Dr. Isaac Pak Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ISAAC PAK DO (NPI 1497249791) is an individual critical care medicine provider in Valhalla, New York, licensed in New York (324740) and active in the NPI registry since June 2018. He is enrolled in Medicare PECOS, is affiliated with John T Mather Memorial Hospital Of Port Jefferson, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Isaac Pak Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Isaac Pak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Port Jefferson, NY 11777
- Reassigned Medicare billing, New York enrollment
- Also billed through NPI 1467249334 (New York)
- 232 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
John T Mather Memorial Hospital Of Port Jefferson
Acute Care Hospitals · Port Jefferson, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10595 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
VALHALLA, NY 10595
VALHALLA, NY 10595
VALHALLA, NY 10595
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Isaac Pak's NPI number?
The NPI number for Isaac Pak is 1497249791. It was assigned to this individual provider in the NPPES registry on June 20, 2018.
Where is Isaac Pak located?
Isaac Pak practices at 100 Woods Rd, Valhalla, NY 10595. The listed phone number is (914) 493-7000.
What is Isaac Pak's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Isaac Pak enrolled in Medicare?
Yes. Isaac Pak is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Isaac Pak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Isaac Pak reassigns Medicare benefits to John T. Mather Memorial Hospital (Port Jefferson, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Isaac Pak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Isaac Pak affiliated with any hospitals?
According to CMS data, Isaac Pak is affiliated with John T Mather Memorial Hospital Of Port Jefferson.
When was this NPI record last updated?
The NPPES record for Isaac Pak was last updated on May 13, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Isaac Pak, DO · NPI 1497249791
Critical Care Medicine physician in Valhalla, New York. Individual provider, active in the CMS NPPES registry since June 20, 2018.
## Identity
- **NPI:** 1497249791 (Entity type: Individual)
- **Enumerated:** June 20, 2018
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 324740 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 WOODS RD, Valhalla, NY 10595-1530
- **Phone:** (914) 493-7000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** John T. Mather Memorial Hospital (NPI 1104913748, Port Jefferson, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Pacific Nw Un Of Hs, Col Of Osteopathic Medicine, class of 2018
## Record status
- **NPPES last updated:** May 13, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1497249791) · Data from the CMS NPPES public registry.