KATHERINE L MOSTRAG NP
NPI 1336543404
Nurse Practitioner - Acute Care in New York, NY
About Katherine L Mostrag Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KATHERINE L MOSTRAG NP (NPI 1336543404) is an individual acute care provider in New York, New York, licensed in New York (432955) and active in the NPI registry since October 2014. She is enrolled in Medicare PECOS, is affiliated with Hunterdon Medical Center, and is a graduate of Other (2023).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
Katherine L Mostrag Np 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
7Medicare enrollment records show Katherine Mostrag reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Flemington, NJ 08822
- Reassigned Medicare billing, New Jersey enrollment
- 141 clinicians in this Medicare group
Turnersville, NJ 08012
- Reassigned Medicare billing, New Jersey enrollment
- 32 clinicians in this Medicare group
Falls Church, VA 22042
- Reassigned Medicare billing, Virginia enrollment
- 1,294 clinicians in this Medicare group
South Riding, VA 20152
- Reassigned Medicare billing, Virginia enrollment
- Medicare enrollment name: Uva Community Health Medical Group LLC
- 584 clinicians in this Medicare group
Richmond, VA 23226
- Reassigned Medicare billing, Virginia enrollment
- 134 clinicians in this Medicare group
Charlottesville, VA 22911
- Reassigned Medicare billing, Virginia enrollment
- 2,820 clinicians in this Medicare group
Boynton Beach, FL 33426
- Reassigned Medicare billing, New York enrollment
- 7,712 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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Hunterdon Medical Center
Acute Care Hospitals · Flemington, NJUniversity Of Virginia Medical Center
Acute Care Hospitals · Charlottesville, VANovant Health Uva Health System Culpeper Med Cente
Acute Care Hospitals · Culpeper, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10016 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
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 Katherine Mostrag's NPI number?
The NPI number for Katherine Mostrag is 1336543404. It was assigned to this individual provider in the NPPES registry on October 17, 2014.
Where is Katherine Mostrag located?
Katherine Mostrag practices at 550 1st Ave, New York, NY 10016. The listed phone number is (212) 263-7300.
What is Katherine Mostrag's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Acute Care, with taxonomy code 363LA2100X.
Is Katherine Mostrag enrolled in Medicare?
Yes. Katherine Mostrag 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 Katherine Mostrag's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Mostrag reassigns Medicare benefits to 7 organizations: Hunterdon Specialty Care, PC (Flemington, NJ), Critical Care Physicians Of New Jersey PC (Turnersville, NJ), Emergency Medicine Associates P.A., P.C. (Falls Church, VA), Nmg Affiliate Practice I, LLC (South Riding, VA), Sound Physicians Intensivists Of Virginia LLC (Richmond, VA) and 2 more organizations, listed in the Medicare section above. 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 Katherine Mostrag's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Katherine Mostrag accept?
Health plans from Oscar Health list Katherine Mostrag as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Katherine Mostrag affiliated with any hospitals?
According to CMS data, Katherine Mostrag is affiliated with Hunterdon Medical Center, University Of Virginia Medical Center and Novant Health Uva Health System Culpeper Med Cente.
When was this NPI record last updated?
The NPPES record for Katherine Mostrag was last updated on April 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months 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.
# Katherine L Mostrag, NP · NPI 1336543404
Acute Care physician in New York, New York. Individual provider, active in the CMS NPPES registry since October 17, 2014.
## Identity
- **NPI:** 1336543404 (Entity type: Individual)
- **Enumerated:** October 17, 2014
- **Primary specialty:** Nurse Practitioner - Acute Care · taxonomy 363LA2100X
- **State license:** 432955 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 550 1ST AVE, New York, NY 10016-6402
- **Phone:** (212) 263-7300
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Hunterdon Specialty Care, PC (NPI 1952024309, Flemington, NJ); Critical Care Physicians Of New Jersey PC (NPI 1154682680, Turnersville, NJ); Emergency Medicine Associates P.A., P.C. (NPI 1134117393, Falls Church, VA); Nmg Affiliate Practice I, LLC (NPI 1922449263, South Riding, VA); Sound Physicians Intensivists Of Virginia LLC (NPI 1619520806, Richmond, VA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** April 8, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1336543404) · Data from the CMS NPPES public registry.