OSULLIVAN PATHOLOGY PLLC
NPI 1487105169
Pathology - Anatomic Pathology & Clinical Pathology in Fredericksburg, VA

Q: What is Osullivan Pathology PLLC's NPI number?

The NPI number for Osullivan Pathology PLLC is 1487105169. It was assigned to this organization in the NPPES registry on October 18, 2016.

Q: What is Osullivan Pathology PLLC's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Active since October 18, 2016

4600 SPOTSYLVANIA PKWY, FREDERICKSBURG, VA 22408(703) 257-1440 Get Directions Write a Review

NPPES record last updated: December 22, 2016. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 22, 2016, Oct 18, 2016 (2 updates tracked since 2016).

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About Osullivan Pathology Pllc NPPES

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

OSULLIVAN PATHOLOGY PLLC (NPI 1487105169) is a healthcare organization registered as an anatomic pathology & clinical pathology in Fredericksburg, Virginia and active in the NPI registry since October 2016. The organization lists Emerald Osullivan-mejia, Owner, as its authorized official.

NPPES Registry Identity

NPI1487105169

Entity TypeOrganization

Primary Taxonomy207ZP0102X

Legal Business NameOSULLIVAN PATHOLOGY PLLC

Location Address4600 SPOTSYLVANIA PKWYFredericksburg, VA 22408-7762

Mailing Address9834 Business WayManassas, VA 20110-4151 · (703) 257-1440 · Fax (703) 257-4337

Phone(703) 257-1440

Organization SubpartNo

Authorized OfficialEmerald Osullivan-mejiaOwner · (703) 257-1440

Enumeration DateOctober 18, 2016

Last NPPES UpdateDecember 22, 20162 updates tracked since enumeration

✔ NPI 1487105169 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians

Taxonomy Code207ZP0102X

License✔ Licensed in VA · 0101244383

Definition

A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.

4600 SPOTSYLVANIA PKWY, Fredericksburg, VA 22408

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Osullivan Pathology Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Osullivan Pathology PLLC, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Emerald O'sullivan-Mejia, MD

Pathology

NPI 1548461932

4600 SPOTSYLVANIA PKWY
Fredericksburg, VA 22408

(540) 498-4471

✔ PECOS✔ Accepts Medicare0.1 mi

Maritza Romero Gutierrez, M.D.

Pathology

NPI 1720042526

3600 JOSEPH SIEWICK DR
Fairfax, VA 22033

(703) 391-3654

✔ PECOS46 mi

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

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 Osullivan Pathology PLLC's NPI number?

The NPI number for Osullivan Pathology PLLC is 1487105169. It was assigned to this organization in the NPPES registry on October 18, 2016.

Where is Osullivan Pathology PLLC located?

Osullivan Pathology PLLC is located at 4600 Spotsylvania Pkwy, Fredericksburg, VA 22408. The listed phone number is (703) 257-1440.

What is Osullivan Pathology PLLC's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Osullivan Pathology PLLC enrolled in Medicare?

Yes. Osullivan Pathology PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Osullivan Pathology PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Pathology, reassign their Medicare billing to Osullivan Pathology PLLC. A 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 the clinician's services. Of these, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Osullivan Pathology PLLC was last updated on December 22, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.