Kathleen Sullivan, DO
NPI 1437566593 · Emergency Medicine Physician · West Islip, NY
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kathleen Sullivan, DO is a Emergency Medicine Physician provider in West Islip, NY (NPI 1437566593).
Provider details
- NPI number
- 1437566593
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 274346-219 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
343 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 197 | $196 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 109 | $136 |
| Critical Care, First 30-74 Minutes99291 | 22 | $238 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 15 | $80 |
Typical Medicare-allowed amounts for these services range $80–$238 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-07-21
- Last updated
- 2021-04-05
- Certified
- 2021-04-05
Frequently asked questions
- What is Kathleen Sullivan's NPI number?
- Kathleen Sullivan's National Provider Identifier (NPI) is 1437566593, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kathleen Sullivan's specialty?
- Kathleen Sullivan is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kathleen Sullivan located?
- Kathleen Sullivan's practice location on file with NPPES is 1000 Montauk Hwy, West Islip, NY 11795-4927.
- What is Kathleen Sullivan's phone number?
- The practice phone number listed in the NPPES registry for Kathleen Sullivan is (631) 376-4444.
- Does Kathleen Sullivan accept Medicare?
- Kathleen Sullivan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kathleen Sullivan's NPI active?
- Yes — Kathleen Sullivan's NPI (1437566593) is active in the NPPES registry as of the last update on 2021-04-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.