Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John M Wallmark, MD

Individual provider Hematology & Oncology Physician · NPI 1689755365

John M Wallmark, MD is a Hematology/Oncology in Rockville, Maryland. Graduated from Hahnemann University College of Medicine in 1992, 34 years ago. Practices with Maryland Oncology Hematology PA, a 101-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Maryland.

Years since qualifying
34
Trained at
Hahnemann University College of Medicine
Licensed in
MD
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

9707 Medical Center Dr Ste 300
Rockville, MD 20850-3348
Phone: (301) 424-6231
Fax: (301) 294-4648
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence D0053177 (MD)

Record details

NPI number1689755365
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 18, 2006
Last updated in NPPESAugust 1, 2012

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolHAHNEMANN UNIVERSITY COLLEGE OF MEDICINE
Graduated 1992 (34 years in practice)
Group practice Maryland Oncology Hematology Pa — 101 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

Other providers in Rockville