DR. TIMOTHY SULLIVAN M.D.
NPI 1811139702
Internal Medicine - Infectious Disease in New York, NY
About Dr. Timothy Sullivan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. TIMOTHY SULLIVAN M.D. (NPI 1811139702) is an individual infectious disease provider in New York, New York, licensed in New York (261988) and active in the NPI registry since March 2009. He is enrolled in Medicare PECOS, is affiliated with Mount Sinai Hospital, and maintains 4 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 4
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. Timothy Sullivan 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 Timothy Sullivan 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
- 769 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mount Sinai Hospital
Acute Care Hospitals · New York, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10029 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 10029
NEW YORK, NY 10029
NEW YORK, NY 10029
NEW YORK, NY 10029
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 Timothy Sullivan's NPI number?
The NPI number for Timothy Sullivan is 1811139702. It was assigned to this individual provider in the NPPES registry on March 24, 2009.
Where is Timothy Sullivan located?
Timothy Sullivan practices at 1 Gustave L Levy Pl, New York, NY 10029. The listed phone number is (212) 241-6741.
What is Timothy Sullivan's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Timothy Sullivan enrolled in Medicare?
Yes. Timothy Sullivan 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 Timothy Sullivan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Sullivan 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 Timothy Sullivan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Timothy Sullivan affiliated with any hospitals?
According to CMS data, Timothy Sullivan is affiliated with Mount Sinai Hospital.
When was this NPI record last updated?
The NPPES record for Timothy Sullivan was last updated on March 6, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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. Timothy Sullivan, M.D. · NPI 1811139702
Infectious Disease physician in New York, New York. Individual provider, active in the CMS NPPES registry since March 24, 2009.
## Identity
- **NPI:** 1811139702 (Entity type: Individual)
- **Enumerated:** March 24, 2009
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** 261988 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 GUSTAVE L LEVY PL, New York, NY 10029-6504
- **Phone:** (212) 241-6741
## 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:** Icahn School Of Medicine At Mount Sinai (NPI 1659639524, New York, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Georgetown University School Of Medicine, class of 2009
## Record status
- **NPPES last updated:** March 6, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1811139702) · Data from the CMS NPPES public registry.