Alexander Stessin, M.D., PH.D.
NPI 1598992802 · Radiation Oncology Physician · Stony Brook, NY
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Stessin, M.D., PH.D. is a Radiation Oncology Physician provider in Stony Brook, NY (NPI 1598992802).
Provider details
- NPI number
- 1598992802
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 274556 (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
17 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
1,659 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) |
|---|---|---|
| Stereoscopic X-Ray Guidance for Localization of Target Volume for the Delivery of Radiation TherapyG6002 | 544 | $23 |
| Calculation of Radiation Therapy Dose77300 | 256 | $37 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 146 | $220 |
| Design and Construction of Complex Radiation Treatment Device77334 | 138 | $69 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 118 | $75 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 79 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-06-12
- Last updated
- 2014-12-08
Frequently asked questions
- What is Alexander Stessin's NPI number?
- Alexander Stessin's National Provider Identifier (NPI) is 1598992802, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Stessin's specialty?
- Alexander Stessin is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Stessin located?
- Alexander Stessin's practice location on file with NPPES is Dept of Radiation Oncology Stony Brook Univ, Stony Brook, NY 11794-7028.
- What is Alexander Stessin's phone number?
- The practice phone number listed in the NPPES registry for Alexander Stessin is (347) 524-0947.
- Does Alexander Stessin accept Medicare?
- Alexander Stessin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Stessin's NPI active?
- Yes — Alexander Stessin's NPI (1598992802) is active in the NPPES registry as of the last update on 2014-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.