DR. JOHANNA KATE HALFON MD
NPI 1194045476
Obstetrics & Gynecology in New York, NY
About Dr. Johanna Kate Halfon Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHANNA KATE HALFON MD (NPI 1194045476) is an individual obstetrics & gynecology provider in New York, New York, licensed in New York (269331-1) and active in the NPI registry since June 2010. She is enrolled in Medicare PECOS, is affiliated with John T Mather Memorial Hospital Of Port Jefferson, and maintains a secondary practice location in Mechanicsville.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Johanna Kate Halfon Md 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 Reassignments
2Medicare enrollment records show Johanna Halfon reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10032
- Reassigned Medicare billing, New York enrollment
- Also billed through NPI 1982993184 (New York)
- 3,922 clinicians in this Medicare group
Stony Brook, NY 11794
- Reassigned Medicare billing, New York enrollment
- 125 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 4
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 2
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, NYSuny/Stony Brook University Hospital
Acute Care Hospitals · Stony Brook, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10032 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.
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
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 Johanna Halfon's NPI number?
The NPI number for Johanna Halfon is 1194045476. It was assigned to this individual provider in the NPPES registry on June 9, 2010.
Where is Johanna Halfon located?
Johanna Halfon practices at 161 Fort Washington Ave, New York, NY 10032. The listed phone number is (212) 305-5515.
What is Johanna Halfon's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Johanna Halfon enrolled in Medicare?
Yes. Johanna Halfon 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 organizations bill Medicare for Johanna Halfon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Johanna Halfon reassigns Medicare benefits to 2 organizations: Trustees Of Columbia University In The City Of New York (New York, NY) and University Associates In Obstetrics & Gynecology, University Faculty P (Stony Brook, NY). Each 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 Johanna Halfon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Johanna Halfon affiliated with any hospitals?
According to CMS data, Johanna Halfon is affiliated with John T Mather Memorial Hospital Of Port Jefferson and Suny/Stony Brook University Hospital.
When was this NPI record last updated?
The NPPES record for Johanna Halfon was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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. Johanna Kate Halfon, MD · NPI 1194045476
Obstetrics & Gynecology physician in New York, New York. Individual provider, active in the CMS NPPES registry since June 9, 2010.
## Identity
- **NPI:** 1194045476 (Entity type: Individual)
- **Enumerated:** June 9, 2010
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 269331-1 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 161 FORT WASHINGTON AVE, New York, NY 10032-3729
- **Phone:** (212) 305-5515
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Trustees Of Columbia University In The City Of New York (NPI 1477068971, New York, NY); University Associates In Obstetrics & Gynecology, University Faculty P (NPI 1538114723, Stony Brook, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Yale University School Of Medicine, class of 2010
## Record status
- **NPPES last updated:** July 21, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1194045476) · Data from the CMS NPPES public registry.