Dr. Stephen Edward Mercer , MD PHD
Pathology - Anatomic Pathology • Doylestown, PA
2003 Lower State Rd Bldg 200
Doylestown, PA 189012622
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Stephen Mercer is listed in NPPES under Pathology - Anatomic Pathology.
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NPI assigned on June 9, 2008; this date does not establish years in practice.
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Published CMS data list 12,883 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 88305 — Pathology examination of tissue using a microscope, intermediate complexity: 10,068 service units.
- 88342 — Special stained specimen slides to examine tissue, initial procedure: 1,777 service units.
- 88341 — Special stained specimen slides to examine tissue, each additional procedure: 356 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 8 records in the table · Guide: How to read Medicare Part B data
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More Medicare Part B services than 95% of clinicians listed under Pathology - Anatomic Pathology in Pennsylvania (2024, 82 clinicians with data). Median for this group: 1,379. Middle half: 863 to 1,846.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 7,366 in 2020 to 12,883 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
2003 Lower State Rd Bldg 200
Doylestown, PA 189012622
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Hamilton Square, NJ. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 2 distinct group names: Dermatology And Mohs Surgery Center Pc; Pathology Associates Of Princeton. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
State University Of Ny Upstate Medical University
2007
What Public CMS Data Show
Pathology - Anatomic Pathology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
6,124 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $483,552 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $381,116 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
Years since graduation
19 years (graduated 2007)
CMS Doctors and Clinicians data list 2007 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Mercer has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Mercer as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Doylestown and Pennsylvania
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Pathology - Anatomic Pathology in Pennsylvania (2024, 82 clinicians with data). Median for this group: 1,379. Middle half: 863 to 1,846.
Too few clinicians listed under Pathology - Anatomic Pathology in Doylestown have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Pathology - Anatomic Pathology in Pennsylvania (2024, 82 clinicians with data). Median for this group: $54,049. Middle half: $33,600 to $69,407.
Too few clinicians listed under Pathology - Anatomic Pathology in Doylestown have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Pathology - Anatomic Pathology in Pennsylvania (2024, 82 clinicians with data). Median for this group: $42,619. Middle half: $26,285 to $52,615.
Too few clinicians listed under Pathology - Anatomic Pathology in Doylestown have Medicare Part B data for 2024 to compare.
1 active clinicians are listed under Pathology - Anatomic Pathology with a practice address in Doylestown, PA (144 in Pennsylvania).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 75% from 7,366 in 2020 to 12,883 in 2024.
- 2020: 7,366
- 2021: 7,227
- 2022: 6,675
- 2023: 8,743
- 2024: 12,883
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Medicare-allowed amount
Medicare-allowed amount stayed about the same: $500,298 in 2020 and $483,552 in 2024.
- 2020: $500,298
- 2021: $518,806
- 2022: $468,683
- 2023: $392,676
- 2024: $483,552
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Paid by Medicare
Paid by Medicare varied from year to year: $374,705 in 2020 and $381,116 in 2024.
- 2020: $374,705
- 2021: $392,871
- 2022: $351,705
- 2023: $293,505
- 2024: $381,116
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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88305
Pathology examination of tissue using a microscope, intermediate complexity
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10,068 | 5,851 | $97.75 | $39.04 |
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88342
Special stained specimen slides to examine tissue, initial procedure
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1,777 | 1,422 | $78.89 | $36.95 |
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88341
Special stained specimen slides to examine tissue, each additional procedure
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356 | 248 | $60.51 | $29.13 |
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88304
Pathology examination of tissue using a microscope, moderately low complexity
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299 | 273 | $87.50 | $12.03 |
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88312
Special stained specimen slides to identify organisms including interpretation and report
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288 | 259 | $70.82 | $27.71 |
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88305
Pathology examination of tissue using a microscope, intermediate complexity
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68 | 60 | $142.00 | $38.90 |
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88313
Special stained specimen slides to examine tissue including interpretation and report
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15 | 11 | $32.22 | $12.51 |
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88300
Pathology examination of tissue using a microscope, limited examination
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12 | 12 | $37.50 | $4.69 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-03-25NUCC Taxonomy Code: 207ZP0101X
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.
NUCC Taxonomy Code: 207ZP0101X
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.
NUCC Taxonomy Code: 207ZD0900X
A dermatopathologist is an expert in diagnosing and monitoring diseases of the skin including infectious, immunologic, degenerative, and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings, and smears of skin lesions by means of light microscopy, electron microscopy, and fluorescence microscopy.
NUCC Taxonomy Code: 207ZP0101X
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.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PATHOLOGY
I20190708002476
PA
4880866599
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Dermatology And Mohs Surgery Center Pc
2003 Lower State Rd, Doylestown, PA 189012622
Phone: 2153456647
Dermatology And Mohs Surgery Center Pc
920 Lawn Ave, Sellersville, PA 189601560
Phone: 2673541440
Pathology Associates Of Princeton
1 Plainsboro Rd, Plainsboro, NJ 085361913
Phone: 6098536800
Secondary Practice Locations
1700 Whitehorse Hamilton Square Rd
Hamilton Square, NJ 086903536
Phone: 6098902600
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant (Certified)
Dermatology
Doctor of Osteopathic Medicine (D.O.)
Nurse Practitioner
Nurse Practitioner
Dermatology
Doctor of Medicine (M.D.)
Physician Assistant - Medical
PHYSICIANASSISTANT
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at PO BOX 23329, NEW YORK, NY 100873329 (Tel: 4108738500)
Pathology (license number reported to NPPES: PA MD464757)
Registered at 2003 LOWER STATE RD BLDG 200, DOYLESTOWN, PA 189012622 (Tel: 2153456647)
Pathology (license number reported to NPPES: NJ 25MA08943200)
NPI status registered as active in NPPES database
Registered at 1700 WHITEHORSE HAMILTON SQUARE RD, HAMILTON SQUARE, NJ 086903536 (Tel: 6098902600)
Registered at 1700 WHITEHORSE HAMILTON SQUARE RD, HAMILTON SQUARE, NJ 086903536 (Tel: 6098902600)
Recorded as STEPHEN MERCER, MD PHD
Pathology (license number reported to NPPES: NJ 25MA08943200)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
Po Box 23329
New York, NY 100873329
Phone: 4108738500