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DR. MICHAEL JOSEPH HORWATH MD
NPI 1861427932
Internal Medicine - Endocrinology, Diabetes & Metabolism in Alexandria, VA

Active since July 11, 2006PECOS Enrolled
81.28/100
CMS Quality Rating
6355 WALKER LN STE 405, ALEXANDRIA, VA 22310(703) 719-6715(703) 719-5762 Get Directions Write a Review

NPPES record last updated: September 21, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 21, 2021, Oct 20, 2020 (2 updates tracked since 2020).

About Dr. Michael Joseph Horwath Md NPPES

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

DR. MICHAEL JOSEPH HORWATH MD (NPI 1861427932) is an individual endocrinology, diabetes & metabolism provider in Alexandria, Virginia, licensed in Virginia (0101037920) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Reston.

NPPES Registry Identity

NPI1861427932
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameDR. MICHAEL JOSEPH HORWATHCredential: MD
Location Address6355 WALKER LN STE 405Alexandria, VA 22310-3238
Mailing Address6035 Burke Ctr Pkwy, #390Burke, VA 22015-3750 · (703) 709-6116 · Fax (703) 978-7762
Phone(703) 719-6715
Fax(703) 719-5762
Sole ProprietorYes
Enumeration DateJuly 11, 2006
Last NPPES UpdateSeptember 21, 20212 updates tracked since enumeration
NPPES CertifiedSeptember 21, 2021
✔ NPI 1861427932 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
Licenses✔ Licensed in VA · 0101037920✔ Licensed in VA · 37920
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
6355 WALKER LN STE 405, Alexandria, VA 22310
Open in Google Maps ↗

Secondary Practice Location 1

Location 11800 Town Center Dr, #216Reston, VA 20190-3238 · Phone (703) 978-1196

Other Identifiers 10

Other3300090United Healthcare
Other49D0715982Clia
Medicaid6076815VA
Other010056459Medicare Railroad
OtherHT7896Cigna Healthcare
Other33308Affordable
Other2027Carefirst Bcbs
Other497389Aetna
Other096526Anthem Bcbs
Other312418Optimum Choice

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Michael Joseph Horwath Md 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.

Medicare Billing Reassignment

Medicare enrollment records show Michael Horwath reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Inova Health Care Services
7.2 mi
Internal Medicine
3300 GALLOWS RD, PHYSICIAN SERVICES
Falls Church, VA 22042
  • Reassigned Medicare billing, District of Columbia and Virginia enrollments
  • Also billed through NPI 1588717755 (Virginia)
  • 2,618 clinicians in this Medicare group
NPI 1952320061 (703) 321-2627

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 22310 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
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
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.

81.28/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality70.77
Promoting Interoperability100
Improvement Activities40
Cost66.84

Referred Medical Equipment & Supplies CMS DME claims 4

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
11 suppliers26 claims161 services$6.37 avg. paid by Medicare
Normal, low and high calibrator solution / chips A4256
DME-Other DME · category DE000N
5 suppliers13 claims13 services$2.92 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
7 suppliers20 claims60 services$1.22 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
6 suppliers56 claims57 services$190.94 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 3

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

DR. MEHREEN ZAHRA HUSAIN M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
6355 WALKER LN STE 405
ALEXANDRIA, VA 22310
Fairfax County (703) 719-6715
DR. LEENA JHA MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
6355 WALKER LN STE 405
ALEXANDRIA, VA 22310
Fairfax County (703) 719-6715
DR. OKSANA DAVYDOV MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
6355 WALKER LN STE 405
ALEXANDRIA, VA 22310
Fairfax County (703) 719-6715

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 Michael Horwath's NPI number?

The NPI number for Michael Horwath is 1861427932. It was assigned to this individual provider in the NPPES registry on July 11, 2006.

Where is Michael Horwath located?

Michael Horwath practices at 6355 Walker Ln Ste 405, Alexandria, VA 22310. The listed phone number is (703) 719-6715.

What is Michael Horwath's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Michael Horwath enrolled in Medicare?

Yes. Michael Horwath is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michael Horwath's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Horwath reassigns Medicare benefits to Inova Health Care Services (Falls Church, VA). The 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 Michael Horwath's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Michael Horwath was last updated on September 21, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.