William Harpster, MD
Internal Medicine Physician · Washington, DC
William Harpster, MD is an internal medicine physician with a practice address in Washington, District of Columbia, and NPI 1689683401, issued on Aug 8, 2006. Check the license (District of Columbia MD22158, as entered in NPPES) on the District of Columbia Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- William Harpster
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD22158 DC
Self-reported in NPPES; status is on the state search - Practice location
- 425 2ND St NW, Washington, DC 20001
- Phone
- (202) 508-0506
- Enumerated
- Aug 8, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (202) 508-0525
- Medicare enrollment
- Enrolled (PECOS I20050810000884); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Homeopathic Medical School, 1971
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 901 in District of Columbia → Look up another NPI →
Also registered at 425 2ND St NW
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Harpster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDistrict of Columbia Board of Medicine
Search for license MD22158Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,306 Medicare Part D claims for 100 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Atorvastatin Calcium152 claims
- Amlodipine Besylate119 claims
- Lisinopril103 claims
- Hydrochlorothiazide77 claims
- Metformin Hcl73 claims
- Tamsulosin Hcl52 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
- Unity Health Care Inc.Washington, DC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Harpster among 901 internal medicine physician records in District of Columbia
William Harpster, MD is one of 901 internal medicine physician records with a practice address in District of Columbia. 73% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 67% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated1971 · median 2008 among the 513 with a school on file
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a District of Columbia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
891 internal medicine physician records list a practice address in Washington
They are 891 of the 45,857 NPPES records with a practice address in Washington, and 901 internal medicine physician records in District of Columbia.
All 901 in District of Columbia → Every provider in Washington → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Anne Cardile, MDWashington, DC 200011992866420
- Renee Chen-Lee, D.O.Washington, DC 200011942297833
- Catherine Crosland, MDWashington, DC 200011245218650
- Deborah Edge, M.D.Washington, DC 200011295719136
Common questions
What is William Harpster, MD's NPI number?
William Harpster, MD's National Provider Identifier (NPI) is 1689683401, issued on Aug 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Harpster, MD located?
The NPPES record lists a practice address at 425 2ND St NW, Washington, DC, 20001. Phone: (202) 508-0506. Providers update this record themselves, so call before visiting.
How can I verify William Harpster, MD's license?
NPPES lists District of Columbia license number MD22158, as entered by the provider. Search the District of Columbia Board of Medicine at https://dchealth.dc.gov/bomed. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Harpster, MD prescribe under Medicare Part D?
In 2024, William Harpster, MD had 1,306 Medicare Part D claims for 100 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.