DR. LEONARD STEPHEN FISCHER M.D.
NPI 1487614863
Internal Medicine - Gastroenterology in Fairfax, VA

Q: What is Leonard Fischer's NPI number?

The NPI number for Leonard Fischer is 1487614863. It was assigned to this individual provider in the NPPES registry on March 28, 2006.

Q: What is Leonard Fischer's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Leonard Fischer was last updated on July 27, 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.

Active since March 28, 2006PECOS Enrolled

3620 JOSEPH SIEWICK DR, SUITE 307, FAIRFAX, VA 22033(703) 281-1023(703) 620-2331 Get Directions Write a Review

NPPES record last updated: July 27, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Dr. Leonard Stephen Fischer M.d. NPPES

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

DR. LEONARD STEPHEN FISCHER M.D. (NPI 1487614863) is an individual gastroenterology provider in Fairfax, Virginia, licensed in Pennsylvania (MD469668) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1487614863

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. LEONARD STEPHEN FISCHERCredential: M.D.

Location Address3620 JOSEPH SIEWICK DR, SUITE 307Fairfax, VA 22033-1756

Mailing Address500 University Drive, Ca410Hershey, PA 17033-2360 · (800) 243-1455

Phone(703) 281-1023

Fax(703) 620-2331

Sole ProprietorNo

Enumeration DateMarch 28, 2006

Last NPPES UpdateJuly 27, 2021

NPPES CertifiedJuly 27, 2021

✔ NPI 1487614863 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in PA · MD469668

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

3620 JOSEPH SIEWICK DR, Fairfax, VA 22033

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Other Identifiers 1

Medicaid5848741VA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Leonard Stephen Fischer M.d. 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 Reassignments

Medicare enrollment records show Leonard Fischer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Privia Medical Group, LLC

14 mi

Internal Medicine

950 N GLEBE RD STE 700
Arlington, VA 22203

Reassigned Medicare billing, District of Columbia and Virginia enrollments
1,534 clinicians in this Medicare group

NPI 1013042480 (571) 366-8850

Milton S Hershey Medical Center Physicians Group

97 mi

Family Medicine

140 OLD WILLOW MILL RD
Mechanicsburg, PA 17050

Reassigned Medicare billing, Pennsylvania enrollment
2,216 clinicians in this Medicare group

NPI 1235678939 (717) 766-4635

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 22033 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.

Reported Quality Measures

e-Prescribing

At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.

93%843 patients4/55-star benchmark: 99%

Medication Reconciliation

The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.

50%418 patients1/55-star benchmark: 100%

Patient-Specific Education

The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.

70%809 patients3/55-star benchmark: 97%

Provide Patient Access

At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…

98%809 patients4/55-star benchmark: 100%

Secure Messaging

For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure…

71%809 patients4/55-star benchmark: 89%

View, Download, or Transmit (VDT)

At least one patient seen by the MIPS eligible clinician during the performance period (or patient-authorized representative) views, downloads or transmits their health information to a third party during the performance period.

63%809 patients

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

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

DR. WALTER J HODGES JR. MD

Obstetrics & Gynecology

3620 JOSEPH SIEWICK DR, 400
FAIRFAX, VA 22033

Fairfax County (703) 264-7801

CARLA KAY ASPER NP

Nurse Practitioner (Adult Health)

3620 JOSEPH SIEWICK DR, SUITE 307
FAIRFAX, VA 22033

Fairfax County (703) 281-1023

PATRICK MATHENY PA-C

Physician Assistant (Medical)

3620 JOSEPH SIEWICK DR, STE 100
FAIRFAX, VA 22033

Fairfax County (703) 810-5223

FAIR OAKS PODIATRY AND SPORTS

Podiatrist (Foot & Ankle Surgery)

3620 JOSEPH SIEWICK DR, 303
FAIRFAX, VA 22033

Fairfax County (703) 865-6783

KEITH WILLIS LAWHORN MD

Orthopaedic Surgery

3620 JOSEPH SIEWICK DR, SUITE 100
FAIRFAX, VA 22033

Fairfax County (703) 810-5223

MALGORZATA GRADZKA, M.D., P.C.

Internal Medicine (Rheumatology)

3620 JOSEPH SIEWICK DR, SUITE 401
FAIRFAX, VA 22033

Fairfax County (703) 648-9800

JAY C TYROLER M.D.,P.C.

Internal Medicine

3620 JOSEPH SIEWICK DR, SUITE 306
FAIRFAX, VA 22033

Fairfax County (703) 264-0521

NICOLAS GAY PT, DPT

Physical Therapist

3620 JOSEPH SIEWICK DR, SUITE 201
FAIRFAX, VA 22033

Fairfax County (703) 391-0111

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 Leonard Fischer's NPI number?

The NPI number for Leonard Fischer is 1487614863. It was assigned to this individual provider in the NPPES registry on March 28, 2006.

Where is Leonard Fischer located?

Leonard Fischer practices at 3620 Joseph Siewick Dr Suite 307, Fairfax, VA 22033. The listed phone number is (703) 281-1023.

What is Leonard Fischer's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Leonard Fischer enrolled in Medicare?

Yes. Leonard Fischer is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Leonard Fischer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Leonard Fischer reassigns Medicare benefits to 2 organizations: Privia Medical Group, LLC (Arlington, VA) and Milton S Hershey Medical Center Physicians Group (Mechanicsburg, PA). 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 Leonard Fischer'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 Leonard Fischer was last updated on July 27, 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.