Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

GARY A HAAG DO
NPI 1801868237
Anesthesiology in Winchester, VA

Active since February 01, 2006PECOS Enrolled
1840 AMHERST ST, WINCHESTER, VA 22603(540) 536-8000 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Jul 13, 2026, Aug 16, 2022, Apr 8, 2019 (3 updates tracked since 2019).

About Gary A Haag Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GARY A HAAG DO (NPI 1801868237) is an individual anesthesiology provider in Winchester, Virginia, licensed in Maryland (H38515) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801868237
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameGARY A HAAGCredential: DO
Location Address1840 AMHERST STWinchester, VA 22603
Mailing AddressPo Box 3295Winchester, VA 22604-2495 · (540) 662-8336 · Fax (540) 662-8593
Sole ProprietorNo
Enumeration DateFebruary 1, 2006
Last NPPES UpdateJuly 13, 20263 updates tracked since enumeration
NPPES CertifiedAugust 16, 2022
NPI 1801868237 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
Licenses Licensed in MD · H38515 Licensed in VA · 0102201159
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
1840 AMHERST ST, Winchester, VA 22603

Other Identifiers 1

Medicaid005708257VA

Accepted Insurance

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

Enrolled in Medicare (PECOS)

Gary A Haag Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Anesthesiology
1840 AMHERST ST
WINCHESTER, VA 22603

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 Gary Haag's NPI number?

The NPI number for Gary Haag is 1801868237. It was assigned to this individual provider in the NPPES registry on February 1, 2006.

Where is Gary Haag located?

Gary Haag practices at 1840 Amherst St, Winchester, VA 22603. The listed phone number is (540) 536-8000.

What is Gary Haag's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Gary Haag enrolled in Medicare?

Yes. Gary Haag is registered in the Medicare PECOS enrollment system.

What insurance does Gary Haag accept?

Health plans from Blue Cross and Blue Shield of Texas list Gary Haag 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.

When was this NPI record last updated?

The NPPES record for Gary Haag was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.