John Marcelis, MD
Geriatric Medicine (Internal Medicine) Physician · Warminster, PA
John Marcelis, MD is a geriatric medicine (internal medicine) physician with a practice address in Warminster, Pennsylvania, and NPI 1285667105, issued on Jul 7, 2006. Check the license (Pennsylvania MD045170E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- John Marcelis
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License numbers
- MD045170E PA
NJDCATEMP-025750 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 10000 Anns Choice Way, Warminster, PA 18974
- Phone
- (215) 443-3850
- Enumerated
- Jul 7, 2006
- Record last updated
- Feb 26, 2026
- Fax
- (215) 443-3963
- Medicare enrollment
- Enrolled (PECOS I20091125000428); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 228 in Pennsylvania → Look up another NPI →
Also registered at 10000 Anns Choice Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kimberly Bell, CRNPGerontology Nurse Practitioner1760930564
- Karen Fox, D.O.Family Medicine Physician1003889361
- Dara Friter, DPMPodiatrist1982940003
- Vardhana Goswami, M.D.Internal Medicine Physician1902835135
- Charles Gysi, RPHPharmacist1497848345
- Saundra HymanPsychiatric/Mental Health Nurse Practitioner1083911606
Verify John Marcelis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD045170ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
2,101 Medicare Part D claims for 194 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. 20 claims were for opioids.
Most prescribed
- Warfarin Sodium122 claims
- Levothyroxine Sodium104 claims
- Atorvastatin Calcium95 claims
- Amlodipine Besylate73 claims
- Gabapentin70 claims
- Pantoprazole Sodium70 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Erickson Health Medical Group OF Pennsylvania PCWarminster, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Marcelis among 228 geriatric medicine (internal medicine) physician records in Pennsylvania
John Marcelis, MD is one of 228 geriatric medicine (internal medicine) physician records with a practice address in Pennsylvania. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 38% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1987 · median 1998 among the 115 with a school on file
- Record last updated2026 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Pennsylvania
There are 228 geriatric medicine (internal medicine) physician records in Pennsylvania.
All 228 in Pennsylvania → Every provider in Warminster → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Susan Moyer, MDWarminster, PA 189741396798740
- Rita Reichard, MDWarminster, PA 189741699771923
- Monica Sethi, MDAbington, PA 190011619288156
- Susan Denman, M.D.Ambler, PA 190021558428292
- Rebecca Ford, ANPAmbler, PA 190021568521656
- Firas Saidi, MDHuntingdon Valley, PA 190061962472696
- Kathryn Beldowski, M.D.Broomall, PA 190081487947487
- Christopher Hwang, M.D.Broomall, PA 190081912249061
Common questions
What is John Marcelis, MD's NPI number?
John Marcelis, MD's National Provider Identifier (NPI) is 1285667105, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Marcelis, MD located?
The NPPES record lists a practice address at 10000 Anns Choice Way, Warminster, PA, 18974. Phone: (215) 443-3850. Providers update this record themselves, so call before visiting.
How can I verify John Marcelis, MD's license?
NPPES lists Pennsylvania license number MD045170E, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Marcelis, MD prescribe under Medicare Part D?
In 2024, John Marcelis, MD had 2,101 Medicare Part D claims for 194 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.