Dr. Emerald Dawn O'Sullivan-Mejia, MD
- Medicare services, 2024
- 8,288
- Medicare patients, 2024
- 2,555
- Hospital affiliations
- 4
- Industry payments
- $14
- Medical groups
- 6
- Practice address
- 9834 Business Way, Manassas, VA 20110
- Practice phone
- Call (703) 257-1440
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Osullivan Pathology
Manassas, Virginia
Find Dr. O'Sullivan-Mejia's professional email, personal email and mobile number
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Dr. Emerald Dawn O'Sullivan-Mejia is a pathologist in Manassas, Virginia
Dr. O'Sullivan-Mejia practices at Osullivan Pathology in Manassas, Virginia.
Dr. O'Sullivan-Mejia's NPI, 1548461932, was assigned on May 31, 2007. Dr. O'Sullivan-Mejia graduated from Eastern Virginia Medical School in 2005. Dr. O'Sullivan-Mejia holds Virginia license 0101244383.
- NPI
- 1548461932NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5991970634
- NPI enumeration date
- May 31, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (703) 257-1440
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Emerald Dawn O'Sullivan-Mejia practices at Osullivan Pathology in Manassas, Virginia
Dr. O'Sullivan-Mejia's primary practice is Osullivan Pathology, at 9834 Business Way, Manassas, VA 20110 in Manassas City. The practice phone is (703) 257-1440.
- Osullivan Pathology9834 Business Way, Manassas, VA 20110 · Manassas CityPhone(703) 257-1440
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Emerald Dawn O'Sullivan-Mejia is affiliated with 7 sites of care and 6 medical groups
Dr. O'Sullivan-Mejia's primary practice is Osullivan Pathology in Manassas, Virginia. Dr. O'Sullivan-Mejia is also affiliated with Chippenham Hospital. The medical group on file is Capital Digestive Care. Dmand AI also links Dr. O'Sullivan-Mejia to 3 more hospitals, 5 medical groups and 2 group practices and clinics, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Emerald Dawn O'Sullivan-Mejia's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Sullivan-Mejia practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Osullivan Pathology | Available with a free account |
| +6 more sites and 5 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Emerald Dawn O'Sullivan-Mejia is one of 250 pathologists in Virginia
Anatomic pathology and clinical pathology is Dr. O'Sullivan-Mejia's primary specialty in the NPI Registry, under taxonomy code 207ZP0102X. Dr. O'Sullivan-Mejia is licensed in Virginia.
Specialties and state licenses
- Anatomic pathology and clinical pathology, VirginiaPrimary
Pathologists near Dr. O'Sullivan-Mejia
Counts of pathologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Emerald Dawn O'Sullivan-Mejia billed Medicare for 8,288 services in 2024
CMS data shows 8,288 Medicare services from Dr. O'Sullivan-Mejia across 13 procedure codes in 2024, for 2,555 Medicare patients. Medicare paid $225,317 for them.
Dr. O'Sullivan-Mejia's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 6,2862024: 8,28832%
Where Dr. O'Sullivan-Mejia's Medicare services took place, 2024
- In an office6,22075%
- In a facility2,06825%
Dr. O'Sullivan-Mejia compared with the Virginia median for pathologists, 2024
- Dr. O'Sullivan-Mejia
- Virginia median
- Medicare services
- 8,288vs 1,7894.6 times
- Medicare patients
- 2,555vs 7283.5 times
Medians across 258 pathologists in Virginia with Dmand AI profiles that report each measure.
Dr. O'Sullivan-Mejia's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Emerald Dawn O'Sullivan-Mejia treated 2,555 Medicare patients in 2024, average age 73
CMS counts 2,555 Medicare patients who saw Dr. O'Sullivan-Mejia in 2024. The largest group is 65 to 74, with 1,473 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 4% are also on Medicaid. Their average risk score is 1.00, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Sullivan-Mejia's median patient age at 62, with 61% women.
Dr. O'Sullivan-Mejia's Medicare patients by age, 2024
Dr. O'Sullivan-Mejia's Medicare patients by sex, 2024
- Women1,42256%
- Men1,13344%
Chronic conditions among Dr. O'Sullivan-Mejia's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis46%
- Diabetes28%
- Ischemic heart disease28%
- Anxiety21%
- Cancer19%
- Mood disorders19%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Sullivan-Mejia's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women61%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Emerald Dawn O'Sullivan-Mejia takes part in Medicare
Dr. O'Sullivan-Mejia accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Emerald Dawn O'Sullivan-Mejia received $14 in industry payments in 2024
CMS Open Payments shows 1 general payment to Dr. O'Sullivan-Mejia from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Genentech, Inc. paid the most, $14.
Companies that paid Dr. O'Sullivan-Mejia the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Emerald Dawn O'Sullivan-Mejia graduated from Eastern Virginia Medical School
Dr. O'Sullivan-Mejia graduated from Eastern Virginia Medical School in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Emerald Dawn O'Sullivan-Mejia's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Emerald Dawn O'Sullivan-Mejia
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Emerald Dawn O'Sullivan-Mejia's NPI number?
Dr. Emerald Dawn O'Sullivan-Mejia's NPI number is 1548461932. It was assigned on May 31, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Emerald Dawn O'Sullivan-Mejia?
Dr. Emerald Dawn O'Sullivan-Mejia is a pathologist in Manassas, Virginia. The primary specialty in the NPI Registry is Anatomic Pathology & Clinical Pathology Physician (taxonomy code 207ZP0102X).
Where does Dr. Emerald Dawn O'Sullivan-Mejia practice?
Dr. O'Sullivan-Mejia practices at 9834 Business Way, Manassas, VA 20110. Dr. O'Sullivan-Mejia's primary practice is Osullivan Pathology in Manassas, Virginia. Dmand AI also links Dr. O'Sullivan-Mejia to 3 hospitals, 5 medical groups and 2 group practices and clinics.
What is Dr. Emerald Dawn O'Sullivan-Mejia's office phone number?
The practice phone on file for Dr. O'Sullivan-Mejia is (703) 257-1440.
What is Dr. Emerald Dawn O'Sullivan-Mejia's medical license number?
Dr. O'Sullivan-Mejia holds Virginia license 0101244383.
Which hospitals is Dr. Emerald Dawn O'Sullivan-Mejia affiliated with?
Dr. O'Sullivan-Mejia is affiliated with Chippenham Hospital. Dmand AI links Dr. O'Sullivan-Mejia to 3 more hospitals.
What medical group is Dr. Emerald Dawn O'Sullivan-Mejia part of?
Dr. O'Sullivan-Mejia is linked to Capital Digestive Care. Dmand AI links Dr. O'Sullivan-Mejia to 5 more medical groups.
Does Dr. Emerald Dawn O'Sullivan-Mejia accept Medicare?
Yes. CMS data shows Dr. O'Sullivan-Mejia billed Medicare for 8,288 services in 2024, and Dr. O'Sullivan-Mejia accepts Medicare assignment.
How many Medicare patients does Dr. Emerald Dawn O'Sullivan-Mejia see?
CMS counts 2,555 Medicare patients who saw Dr. O'Sullivan-Mejia in 2024, with an average age of 73.
What services does Dr. Emerald Dawn O'Sullivan-Mejia bill to Medicare?
In 2024, Dr. O'Sullivan-Mejia's most billed Medicare services were lab and pathology test (88305), lab and pathology test (88341) and lab and pathology test (88342).
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Where did Dr. Emerald Dawn O'Sullivan-Mejia go to medical school?
Dr. O'Sullivan-Mejia graduated from Eastern Virginia Medical School in 2005.
Has Dr. Emerald Dawn O'Sullivan-Mejia received payments from drug or device companies?
CMS Open Payments shows $14 in general payments to Dr. O'Sullivan-Mejia from 1 company from 2024 to 2024. The largest total came from Genentech, Inc.
How long has Dr. Emerald Dawn O'Sullivan-Mejia been practicing?
Dr. O'Sullivan-Mejia graduated from medical school in 2005, 21 years ago.
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