THERESA RYAN M.D.
NPI 1598766503
Internal Medicine - Hematology & Oncology in New York, NY
About Theresa Ryan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THERESA RYAN M.D. (NPI 1598766503) is an individual hematology & oncology provider in New York, New York, licensed in New York (213963) and active in the NPI registry since August 2005. She is enrolled in Medicare PECOS, is affiliated with Bellevue Hospital Center, and is a graduate of New York University School Of Medicine (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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
Theresa Ryan M.d. 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 Theresa Ryan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
New York, NY 10016
- Reassigned Medicare billing, New York enrollment
- Also billed through NPI 1285826438 (New York)
- 1,074 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Bellevue Hospital Center
Acute Care Hospitals · New York, NYNyu Langone Hospitals
Acute Care Hospitals · New York, NYPhysician 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.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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
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 Theresa Ryan's NPI number?
The NPI number for Theresa Ryan is 1598766503. It was assigned to this individual provider in the NPPES registry on August 2, 2005.
Where is Theresa Ryan located?
Theresa Ryan practices at 160 E 34th St 9th Fl., New York, NY 10016. The listed phone number is (212) 731-5430.
What is Theresa Ryan's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Theresa Ryan enrolled in Medicare?
Yes. Theresa Ryan 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 Theresa Ryan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Theresa Ryan reassigns Medicare benefits to New York University (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 Theresa Ryan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Theresa Ryan affiliated with any hospitals?
According to CMS data, Theresa Ryan is affiliated with Bellevue Hospital Center and Nyu Langone Hospitals.
When was this NPI record last updated?
The NPPES record for Theresa Ryan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Theresa Ryan, M.D. · NPI 1598766503
Hematology & Oncology physician in New York, New York. Individual provider, active in the CMS NPPES registry since August 2, 2005.
## Identity
- **NPI:** 1598766503 (Entity type: Individual)
- **Enumerated:** August 2, 2005
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 213963 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 160 E 34TH ST, 9TH FL., New York, NY 10016-4750
- **Phone:** (212) 731-5430
## 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:** New York University (NPI 1083605679, New York, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York University School Of Medicine, class of 1996
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 02405989 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1598766503) · Data from the CMS NPPES public registry.