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

William Harpster, MD

Individual provider Internal Medicine Physician · NPI 1689683401

William Harpster, MD practises Internal Medicine in Washington, District of Columbia. Graduated from University of Michigan Homeopathic Medical School in 1971, 55 years ago. Practices with Unity Health Care Inc, a 153-clinician group and accepts Medicare assignment. Licensed in District of Columbia.

Years since qualifying
55
Trained at
University of Michigan Homeopathic Medical School
Licensed in
DC
In the registry since
2006
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

425 2nd St NW
Washington, DC 20001-2003 Not confirmed with CMS for 19 years — call before visiting
Phone: (202) 508-0506
Fax: (202) 508-0525
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD22158 (DC)

Record details

NPI number1689683401
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 8, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesPLASTIC AND RECONSTRUCTIVE SURGERY
Medical schoolUNIVERSITY OF MICHIGAN HOMEOPATHIC MEDICAL SCHOOL
Graduated 1971 (55 years in practice)
Group practice Unity Health Care Inc. — 153 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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 patients29
Services billed 65 a service is one billed item, such as a visit, a test or a procedure
Average patient age67

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.

Colleagues at Unity Health Care Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 153 clinicians in the practice; 12 are shown here.

Other providers in Washington