ALLISON MILLE PORTENOY MD
NPI 1497243547
Pediatrics - Pediatric Critical Care Medicine in New York, NY
About Allison Mille Portenoy Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALLISON MILLE PORTENOY MD (NPI 1497243547) is an individual pediatric critical care medicine provider in New York, New York, licensed in New York (311409) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS and is a graduate of Other (2018).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Allison Mille Portenoy Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Allison Portenoy reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 345 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.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Allison Portenoy's NPI number?
The NPI number for Allison Portenoy is 1497243547. It was assigned to this individual provider in the NPPES registry on April 24, 2018.
Where is Allison Portenoy located?
Allison Portenoy practices at 1184 5th Ave Fl 6, New York, NY 10029. The listed phone number is (144) 007-6449.
What is Allison Portenoy's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Critical Care Medicine, with taxonomy code 2080P0203X.
Is Allison Portenoy enrolled in Medicare?
Yes. Allison Portenoy is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Allison Portenoy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Allison Portenoy reassigns Medicare benefits to Icahn School Of Medicine At Mount Sinai (New York, 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 Allison Portenoy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Allison Portenoy was last updated on June 6, 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.
# Allison Mille Portenoy, MD · NPI 1497243547
Pediatric Critical Care Medicine physician in New York, New York. Individual provider, active in the CMS NPPES registry since April 24, 2018.
## Identity
- **NPI:** 1497243547 (Entity type: Individual)
- **Enumerated:** April 24, 2018
- **Primary specialty:** Pediatrics - Pediatric Critical Care Medicine · taxonomy 2080P0203X
- **State license:** 311409 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1184 5TH AVE FL 6, New York, NY 10029-6503
- **Phone:** (144) 007-6449
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Icahn School Of Medicine At Mount Sinai (NPI 1518228550, New York, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** June 6, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1497243547) · Data from the CMS NPPES public registry.