NPPES file of Aug 9, 2026

Benjamin Oldfield, M.D.

Internal Medicine Physician · Washington, DC

Benjamin Oldfield, M.D. is an internal medicine physician with a practice address in Washington, District of Columbia, and NPI 1831465830, issued on Mar 24, 2012. Check the license (District of Columbia MD600003217, as entered in NPPES) on the District of Columbia Board of Medicine; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1831465830
Name
Benjamin Oldfield
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
MD600003217 DC
Self-reported in NPPES; status is on the state search
Practice location
3020 14TH St NW, Washington, DC 20009
Phone
(202) 469-4699
Enumerated
Mar 24, 2012
Record last updated
Jan 17, 2025
Medicare enrollment
Enrolled (PECOS I20161101001759); accepts Medicare assignment
Medical or professional school
Harvard Medical School, 2012
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 901 in District of Columbia → Look up another NPI →

Also registered at 3020 14TH St NW

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Siham AbdiMidwife1790373256
  2. Vanessa Acosta, APRNPsychiatric/Mental Health Nurse Practitioner1881431203
  3. Marjorie Archila, PA-CPhysician Assistant1730046848
  4. Daniel Baker, MS, RN, AGACNP-BCAcute Care Nurse Practitioner1144689258
  5. Arnaz Bankwalla, M.D.Family Medicine Physician1760454045
  6. Latoya Barham, DDSPediatric Dentistry1508955378

Verify Benjamin Oldfield in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersDistrict of Columbia Board of Medicine
    Search for license MD600003217    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the District of Columbia license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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41% more Medicare Part D claims than the average internal medicine physician in 2024

4,476 Medicare Part D claims for 227 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 158 claims were for opioids.

  1. Benjamin Oldfield4,476
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium227 claims
  2. Albuterol Sulfate Hfa170 claims
  3. Gabapentin135 claims
  4. Lisinopril122 claims
  5. Amlodipine Besylate121 claims
  6. Metformin Hcl117 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

  1. 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).

Benjamin Oldfield among 901 internal medicine physician records in District of Columbia

Benjamin Oldfield, M.D. 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 2012, is newer than 62% of them.

  • NPI issued2012 · 62% of these records are older, 33% newer
  • In a Medicare fileYes · 73% of these records are
  • In the CMS Doctors and Clinicians fileYes · 57% of these records are
  • Graduated2012 · median 2008 among the 513 with a school on file
  • Record last updated2025 · 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

  1. Ravi Ajmera, MDWashington, DC 200091205877131
  2. Eugenia Ayers, MDWashington, DC 200091346315256
  3. Robert Ball, MDWashington, DC 200091326052051
  4. Leslie Fenton, MDWashington, DC 200091396880357
  5. Bruce Furness, M.D.Washington, DC 200091518084920
  6. Ashley Harris, M.D.Washington, DC 200091851406904
  7. Patrik JohanssonWashington, DC 200091699834630
  8. Pamela Marks, M.D.Washington, DC 200091457329203

Common questions

What is Benjamin Oldfield, M.D.'s NPI number?

Benjamin Oldfield, M.D.'s National Provider Identifier (NPI) is 1831465830, issued on Mar 24, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Benjamin Oldfield, M.D. located?

The NPPES record lists a practice address at 3020 14TH St NW, Washington, DC, 20009. Phone: (202) 469-4699. Providers update this record themselves, so call before visiting.

How can I verify Benjamin Oldfield, M.D.'s license?

NPPES lists District of Columbia license number MD600003217, 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 Benjamin Oldfield, M.D. prescribe under Medicare Part D?

In 2024, Benjamin Oldfield, M.D. had 4,476 Medicare Part D claims for 227 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.