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

John Marcelis, MD

Individual provider Geriatric Medicine (Internal Medicine) Physician · NPI 1285667105

John Marcelis, MD practises Internal Medicine in Warminster, Pennsylvania. Graduated from Temple University School of Medicine in 1987, 39 years ago. Practices with Erickson Health Medical Group of Pennsylvania PC, a 20-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in New Jersey and Pennsylvania.

Years since qualifying
39
Trained at
Temple University School of Medicine
Licensed in
NJ, PA
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

10000 Anns Choice Way
Warminster, PA 18974-3527
Phone: (215) 443-3850
Fax: (215) 443-3963
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 3000 Essex Rd, Tinton Falls, NJ 07753-2400 — (732) 643-2070
  • 14703 Eagle Vista Dr, Houston, TX 77077-5394 — (281) 249-7100

Specialties & licences

Geriatric Medicine (Internal Medicine) Physician (primary) Taxonomy 207RG0300X · Licence MD045170E (PA)
Geriatric Medicine (Internal Medicine) Physician Taxonomy 207RG0300X · Licence NJDCATEMP-025750 (NJ)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD045170E (PA)

Record details

NPI number1285667105
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 7, 2006
Last updated in NPPESFebruary 26, 2026
Certification dateFebruary 26, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolTEMPLE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1987 (39 years in practice)
Group practice Erickson Health Medical Group Of Pennsylvania Pc — 20 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 patients337
Services billed 1,645 a service is one billed item, such as a visit, a test or a procedure
Average patient age85

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Ann'S Choice Nursing home · Warminster, PA · listed as Ann's Choice, Inc
  • Ann'S Choice Visiting Nurse Services Home health agency · Warminster, PA

Colleagues at Erickson Health Medical Group of Pennsylvania PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 20 clinicians in the practice; 12 are shown here.

Other providers in Warminster