Mary Hahn, MD
NPI 1275021081 · Vascular Neurology Physician · Stony Brook, NY
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Hahn, MD is a Vascular Neurology Physician provider in Stony Brook, NY (NPI 1275021081).
Provider details
- NPI number
- 1275021081
- Entity type
- Individual
- Primary specialty
- Vascular Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 036.160135 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 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
675 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) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 135 | $93 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 111 | $146 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 89 | $55 |
| Telehealth Consultation, Critical Care, Initial , Physicians Typically Spend 60 Minutes Communicating With the Patient and Providers Via TelehealthG0508 | 53 | $230 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 52 | $103 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-26
- Last updated
- 2023-07-11
- Certified
- 2023-07-11
Frequently asked questions
- What is Mary Hahn's NPI number?
- Mary Hahn's National Provider Identifier (NPI) is 1275021081, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Hahn's specialty?
- Mary Hahn is listed in the NPPES registry with a primary specialty of Vascular Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Hahn located?
- Mary Hahn's practice location on file with NPPES is Health Sciences Center T12-020, Stony Brook, NY 11794-0001.
- What is Mary Hahn's phone number?
- The practice phone number listed in the NPPES registry for Mary Hahn is (631) 444-8118.
- Does Mary Hahn accept Medicare?
- Mary Hahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Hahn's NPI active?
- Yes — Mary Hahn's NPI (1275021081) is active in the NPPES registry as of the last update on 2023-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.