Quick answers
- Does Courtney L. Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Courtney L. Sullivan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Courtney L. Sullivan see?
- In 2024, CMS data shows 33 Original Medicare patients and 37 services for Courtney L. Sullivan. This counts Original Medicare only and measures volume, not quality.
- What is Courtney L. Sullivan's NPI number?
- 1144831603. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Courtney L. Sullivan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 33 |
|---|---|
| Services billed to Medicare | 37 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)28 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)61%
- High blood pressure55%
- Arthritis36%
Hospitals where Courtney L. Sullivan works
Medicare's Facility Affiliation Data lists Courtney L. Sullivan at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Mount Sinai HospitalNew York, NY · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 330024
Practice locations
Addresses where Courtney L. Sullivan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1176 5th AveNew York, NY 10029 (212) 863‑5599
Group practices
Medicare enrollment lists Courtney L. Sullivan as a member of this group (CMS data updated October 2, 2026).
- Icahn School of Medicine at Mount Sinai2,843 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in Icahn School of Medicine at Mount Sinai
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144831603 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians