DR. EMERALD DAWN O'SULLIVAN-MEJIA MD
NPI 1548461932
Pathology - Anatomic Pathology & Clinical Pathology in Fredericksburg, VA

Q: What is Emerald O'sullivan-mejia's NPI number?

The NPI number for Emerald O'sullivan-mejia is 1548461932. It was assigned to this individual provider in the NPPES registry on May 31, 2007.

Q: What is Emerald O'sullivan-mejia's specialty?

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

Active since May 31, 2007PECOS EnrolledAccepts Medicare Assignment

4600 SPOTSYLVANIA PKWY, FREDERICKSBURG, VA 22408(540) 498-4471 Get Directions Write a Review

NPPES record last updated: June 2, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

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About Dr. Emerald Dawn O'sullivan-mejia Md NPPES

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

DR. EMERALD DAWN O'SULLIVAN-MEJIA MD (NPI 1548461932) is an individual anatomic pathology & clinical pathology provider in Fredericksburg, Virginia, licensed in Virginia (0101244383) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS, is affiliated with John Randolph Medical Center, and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1548461932

Entity TypeIndividualFemale

Primary Taxonomy207ZP0102X

Provider Legal NameDR. EMERALD DAWN O'SULLIVAN-MEJIACredential: MD

Location Address4600 SPOTSYLVANIA PKWYFredericksburg, VA 22408-7762

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

Phone(540) 498-4471

Sole ProprietorNo

Medical School CMSOtherGraduated 2005

Enumeration DateMay 31, 2007

Last NPPES UpdateJune 2, 2026

NPPES CertifiedJune 2, 2026

✔ NPI 1548461932 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

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

Taxonomy Code207ZP0102X

Licenses✔ Licensed in VA · 0101244383✔ Licensed in MS · 37259✔ Licensed in TN · 79951

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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Secondary Practice Locations 4

Location 11208 Office Park DrOxford, MS 38655-3597 · Phone (662) 234-9888 · Fax (662) 281-8927

Location 251 Germantown Ct Ste 309Cordova, TN 38018-4290 · Phone (901) 333-0510 · Fax (901) 747-2380

Location 3589 Garfield St Ste 201Tupelo, MS 38801-6301 · Phone (662) 680-5565 · Fax (662) 680-5654

Location 47900 Airways Blvd Ste 100Southaven, MS 38671-4113 · Phone (662) 349-6950 · Fax (662) 349-6634

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health Plan, Inc..Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Emerald Dawn O'sullivan-mejia 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 ID5991970634

PECOS Enrollment IDI20111208000538

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 Emerald O'sullivan-mejia reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Osullivan Pathology PLLC

0.1 mi

Anatomic Pathology & Clinical Pathology

4600 SPOTSYLVANIA PKWY
Fredericksburg, VA 22408

Reassigned Medicare billing, Virginia enrollment
2 clinicians in this Medicare group

NPI 1487105169 (703) 257-1440

Gastroenterology Associates Of Fredericksburg, P.C.

6.3 mi

Gastroenterology

1031 CARE WAY
Fredericksburg, VA 22401

Reassigned Medicare billing, Virginia enrollment
Medicare enrollment name: Gastroenterology Associates Of Fredericksburg PC
13 clinicians in this Medicare group

NPI 1952455735 (540) 371-7600

Forward Pathology Solutions LLC

42 mi

Anatomic Pathology & Clinical Pathology

1602 SKIPWITH RD
Richmond, VA 23229

Reassigned Medicare billing, Virginia enrollment
33 clinicians in this Medicare group

NPI 1982266391 (804) 289-4500

Independent Associates PC

42 mi

Gastroenterology

7605 FOREST AVE, STE 211
Richmond, VA 23229

Reassigned Medicare billing, Virginia enrollment
16 clinicians in this Medicare group

NPI 1023106390 (804) 282-3114

Capital Digestive Care ,llc

74 mi

Gastroenterology

217 BULIFANTS BLVD STE B
Williamsburg, VA 23188

Reassigned Medicare billing, Virginia enrollment
189 clinicians in this Medicare group

NPI 1992752521 (757) 534-7701

Gastroenterology Center Of The Midsouth PLLC

715 mi

Gastroenterology

8000 WOLF RIVER BLVD STE 200
Germantown, TN 38138

Reassigned Medicare billing, Mississippi and Tennessee enrollments
85 clinicians in this Medicare group

NPI 1417932492 (901) 747-3630

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

Areas of Expertise CMS Part B claims 18

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.

Pathology examination of tissue using a microscope, intermediate complexity 88305

A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.

5,881 services1,704 patients

Pathology examination of tissue using a microscope, intermediate complexity 88305

1,120 services623 patients

Special stained specimen slides to examine tissue, each additional procedure 88341

Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.

369 services77 patients

Flow cytometry technique for dna or cell analysis, 16 or more markers 88189

Flow cytometry is a method used to measure and analyze cells. It uses a beam of light to detect up to 16 or more markers on cells, helping to identify their type, function, or abnormalities. This technique aids in diagnosing various health conditions.

162 services150 patients

Special stained specimen slides to examine tissue including interpretation and report 88313

Special stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.

133 services39 patients

Special stained specimen slides to examine tissue, initial procedure 88342

This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.

130 services125 patients

Special stained specimen slides to examine tissue, initial procedure 88342

122 services114 patients

Pathology examination of specimen during surgery, first tissue block 88331

A pathology examination during surgery involves the immediate analysis of a removed tissue sample. This helps the surgeon make decisions during your operation. The "first tissue block" refers to the initial sample examined. It's a vital step to ensure your health.

80 services55 patients

Preparation of tissue for examination by removing any calcium present 88311

This procedure involves treating tissue samples to remove any calcium, which can interfere with the examination. The tissue is soaked in a special solution that safely dissolves the calcium, leaving the tissue intact for accurate analysis. This helps in making precise diagnoses.

52 services44 patients

Pathology examination of tissue using a microscope, moderately low complexity 88304

A pathology examination of tissue, moderately low complexity, involves studying a small sample of your body tissue under a microscope. It helps to identify any abnormal cells or diseases. It's a routine procedure, not complex, and provides crucial insights for your diagnosis.

51 services48 patients

Bone marrow, smear interpretation 85097

Bone marrow smear interpretation is a procedure where a small sample of your bone marrow is taken and examined under a microscope. This helps doctors identify any abnormal cells or signs of diseases such as anemia, leukemia, or infections. It's a crucial step in diagnosing various blood disorders.

37 services28 patients

Pathology examination of tissue using a microscope, moderately high complexity 88307

A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.

37 services31 patients

Special stained specimen slides to identify organisms including interpretation and report 88312

This service involves coloring specimen slides in a special way to help identify organisms. The colors make different parts of the organism stand out. Afterward, a detailed interpretation and report on the findings are provided.

27 services25 patients

Flow cytometry technique for dna or cell analysis, 16 or more markers 88189

20 services19 patients

Special stained specimen slides to examine tissue including interpretation and report 88313

20 services19 patients

Genetic sequencing localization, initial procedure 88365

Genetic sequencing localization is a process to identify where specific genes are located in your DNA. During the initial procedure, a sample of your cells is collected, usually through a simple swab or blood test. This data is then analyzed to pinpoint the location of certain genes. This can help understand your genetic makeup and potential health risks.

19 services17 patients

Special stained specimen slides to identify organisms including interpretation and report 88312

17 services15 patients

Blood smear interpretation by physician with written report 85060

Blood smear interpretation is a lab test where your doctor examines a sample of your blood under a microscope. They look for abnormalities in your blood cells which can help diagnose various conditions. You'll receive a written report of the findings.

11 services11 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

John Randolph Medical Center

Acute Care Hospitals · Hopewell, VA

3/5 CMS rating

OwnershipProprietary

CMS Certification Number490020

Location411 West Randolph RoadHopewell, VA 23860 · Hopewell City County

Emergency services

Cjw Medical Center

Acute Care Hospitals · Richmond, VA

4/5 CMS rating

OwnershipProprietary

CMS Certification Number490112

Location7101 Jahnke RoadRichmond, VA 23235 · Chesterfield County

Emergency services

Henrico Doctors' Hospital

Acute Care Hospitals · Richmond, VA

4/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number490118

Location1602 Skipwith RoadRichmond, VA 23229 · Henrico County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 22408 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

$129.04 typical visit price

range $56.19 – $170.30

Typical copayment $32.26 (range $14.04 – $42.57)

Most-billed visit code 99204

Established Patient

$99.13 typical visit price

range $18.07 – $138.91

Typical copayment $24.78 (range $4.51 – $34.72)

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.

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.

SHERIDAN EMERGENCY PHYSICIAN SERVICES OF VIRGINIA, INC

Emergency Medicine