DAVID K. HAHN MD
NPI 1053625459
Psychiatry & Neurology - Neurology in Greenwich, CT
About David K. Hahn Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DAVID K. HAHN MD (NPI 1053625459) is an individual neurology provider in Greenwich, Connecticut, licensed in Florida (ME134710) and active in the NPI registry since July 2010. He is enrolled in Medicare PECOS, is affiliated with White Plains Hospital Center, and is a graduate of Warren Alpert Medical School Of Brown University (2008).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
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
David K. Hahn Md 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 Reassignments
10Medicare enrollment records show David Hahn reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Greenwich, CT 06830
- Reassigned Medicare billing, Connecticut enrollment
Greenwich, CT 06830
- Reassigned Medicare billing, Connecticut enrollment
- Medicare enrollment name: Northeast Medical Group Inc
- 1,824 clinicians in this Medicare group
White Plains, NY 10601
- Reassigned Medicare billing, New York enrollment
- 479 clinicians in this Medicare group
Norwalk, CT 06850
- Reassigned Medicare billing, Connecticut enrollment
- 113 clinicians in this Medicare group
Brooklyn, NY 11237
- Reassigned Medicare billing, New York enrollment
- 427 clinicians in this Medicare group
Danbury, CT 06810
- Reassigned Medicare billing, Connecticut enrollment
- 818 clinicians in this Medicare group
Brooklyn, NY 11212
- Reassigned Medicare billing, New York enrollment
- 782 clinicians in this Medicare group
Meriden, CT 06451
- Reassigned Medicare billing, Connecticut enrollment
- 505 clinicians in this Medicare group
Torrington, CT 06790
- Reassigned Medicare billing, Connecticut enrollment
- 374 clinicians in this Medicare group
New Britain, CT 06052
- Reassigned Medicare billing, Connecticut enrollment
- 745 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.
White Plains Hospital Center
Acute Care Hospitals · White Plains, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06830 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
GREENWICH, CT 06830
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 David Hahn's NPI number?
The NPI number for David Hahn is 1053625459. It was assigned to this individual provider in the NPPES registry on July 28, 2010.
Where is David Hahn located?
David Hahn practices at 115 Mason St Ste 1, Greenwich, CT 06830. The listed phone number is (203) 276-4464.
What is David Hahn's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.
Is David Hahn enrolled in Medicare?
Yes. David Hahn 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 organizations bill Medicare for David Hahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Hahn reassigns Medicare benefits to 10 organizations: Mason Street Industries LLC (Greenwich, CT), Mill Hill Medical Consultants Inc (Greenwich, CT), East Post Road Medical Services PC (White Plains, NY), Norwalk Hospital Association (Norwalk, CT), Wyckoff Professional Medical Services, PC (Brooklyn, NY) and 5 more organizations, listed in the Medicare section above. Each 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 David Hahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does David Hahn accept?
Health plans from Anthem Blue Cross and Blue Shield list David Hahn as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is David Hahn affiliated with any hospitals?
According to CMS data, David Hahn is affiliated with White Plains Hospital Center.
When was this NPI record last updated?
The NPPES record for David Hahn was last updated on October 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.
# David K. Hahn, MD · NPI 1053625459
Neurology physician in Greenwich, Connecticut. Individual provider, active in the CMS NPPES registry since July 28, 2010.
## Identity
- **NPI:** 1053625459 (Entity type: Individual)
- **Enumerated:** July 28, 2010
- **Primary specialty:** Psychiatry & Neurology - Neurology · taxonomy 2084N0400X
- **State license:** ME134710 (Florida)
- **Sole proprietor:** No
## Practice location
- **Address:** 115 MASON ST STE 1, Greenwich, CT 06830-6630
- **Phone:** (203) 276-4464 · **Fax:** (203) 276-4468
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Mason Street Industries LLC (NPI 1215805536, Greenwich, CT); Mill Hill Medical Consultants Inc (NPI 1245249549, Greenwich, CT); East Post Road Medical Services PC (NPI 1841767274, White Plains, NY); Norwalk Hospital Association (NPI 1427041581, Norwalk, CT); Wyckoff Professional Medical Services, PC (NPI 1659710796, Brooklyn, NY); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Warren Alpert Medical School Of Brown University, class of 2008
## Record status
- **NPPES last updated:** October 28, 2025
- **Other identifiers:** Medicaid 3118697 (NH)
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Source: [NPI Profile](https://npiprofile.com/npi/1053625459) · Data from the CMS NPPES public registry.