Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John McCarthy, CRNP

Individual provider Family Nurse Practitioner · NPI 1952814634

John McCarthy, CRNP is a Nurse Practitioner in Gaithersburg, Maryland. Qualified in 2013, 13 years ago. Practices with Adventist Physician Services Inc, a 144-clinician group and accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
13
Licensed in
MD
In the registry since
2017
What do these letters mean?
CRNP — Certified Registered Nurse Practitioner
The title Pennsylvania and some other states use for a nurse practitioner.

See every abbreviation used in this directory →

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Practice location Address checks out

21034 Woodfield Rd
Gaithersburg, MD 20882-1203
Phone: (301) 509-4150
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence R135272 (MD)

Record details

NPI number1952814634
Entity typeIndividual (Type 1)
GenderMale
Credentials CRNP
Sole proprietorNo
NPI enumeratedNovember 16, 2017
Last updated in NPPESNovember 16, 2017

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice Adventist Physician Services Inc — 144 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients396
Services billed 600 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $234 11 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Adventist Healthcare Shady Grove Medical Center Hospital · Rockville, MD

Colleagues at Adventist Physician Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 144 clinicians in the practice; 12 are shown here.

Other providers in Gaithersburg