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DAVID K. HAHN MD
NPI 1053625459
Psychiatry & Neurology - Neurology in Greenwich, CT

Active since July 28, 2010PECOS EnrolledAccepts Medicare Assignment
94.24/100
CMS Quality Rating
115 MASON ST STE 1, GREENWICH, CT 06830(203) 276-4464(203) 276-4468 Get Directions Write a Review

NPPES record last updated: October 28, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Mar 9, 2020, Oct 22, 2019, May 6, 2019 and 2 more (5 updates tracked since 2015).

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

NPI1053625459
Entity TypeIndividualMale
Primary Taxonomy2084N0400X
Provider Legal NameDAVID K. HAHNCredential: MD
Location Address115 MASON ST STE 1Greenwich, CT 06830-6630
Mailing Address115 Mason St Ste 1Greenwich, CT 06830-6630 · (718) 514-0224
Phone(203) 276-4464
Fax(203) 276-4468
Sole ProprietorNo
Medical School CMSWarren Alpert Medical School Of Brown UniversityGraduated 2008
Enumeration DateJuly 28, 2010
Last NPPES UpdateOctober 28, 20255 updates tracked since enumeration
NPPES CertifiedOctober 28, 2025
✔ NPI 1053625459 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
Licenses✔ Licensed in FL · ME134710✔ Licensed in CT · 54629✔ Licensed in MI · 4301114366✔ Licensed in NH · 19408
Definition

A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.

115 MASON ST STE 1, Greenwich, CT 06830
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Other Identifiers 1

Medicaid3118697NH

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID7911217724
PECOS Enrollment IDI20151106001648, I20170615000578
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
129 services125 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
108 services81 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
33 services33 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
23 services23 patients

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, NY
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330304
Location41 East Post R0adWhite Plains, NY 10601 · Westchester County
Emergency services Birthing friendly

Physician 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.

New Patient
$138.84 typical visit price
range $60.82 – $183.10
Typical copayment $34.71 (range $15.20 – $45.77)
Most-billed visit code 99204
Established Patient
$106.68 typical visit price
range $19.76 – $149.26
Typical copayment $26.67 (range $4.94 – $37.31)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

94.24/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality78.26
Promoting Interoperability100
Improvement Activities40

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.

DR. CAROLYN J. HAHN M.D.
Psychiatry & Neurology (Psychiatry)
115 MASON ST STE 1
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 997-7558
MASON STREET INDUSTRIES LLC
Psychiatry & Neurology (Neurology)
115 MASON ST STE 1
GREENWICH, CT 06830
Western Connecticut Planning Region (718) 514-0224

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.

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 with the weekly NPPES data releases published by CMS.