Justin Peng, MD
Rheumatology Physician · Washington, DC
Justin Peng, MD is a rheumatology physician with a practice address in Washington, District of Columbia, and NPI 1538328141, issued on Jun 9, 2008. Check the license (District of Columbia MD037073, as entered in NPPES) on the District of Columbia Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Justin Peng
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License numbers
- MD037073 DC
D0072143 MD
0101242489 VA
Self-reported in NPPES; status is on the state search - Practice location
- 2021 K St NW, Washington, DC 20006
- Phone
- (301) 942-7600
- Enumerated
- Jun 9, 2008
- Record last updated
- Feb 5, 2026
- Fax
- (202) 419-0418
- Medicare enrollment
- Enrolled (PECOS I20241211000378); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2005
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 57 in District of Columbia → Look up another NPI →
Also registered at 2021 K St NW
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sabrina Altema, DPTPhysical Therapist1619112745
- Lara Annese, PTOrthopedic Physical Therapist1336339613
- Alyssa BanksPhysical Therapist1134519168
- Richard Barth, M.D.Orthopaedic Hand Surgery Physician1124133384
- Werner Barth, M.D.Rheumatology Physician1659370948
- David Borenstein, MDRheumatology Physician1366441727
Verify Justin Peng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDistrict of Columbia Board of Medicine
Search for license MD037073Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average rheumatology physician in 2024
1,077 Medicare Part D claims for 214 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 59 claims were for opioids.
Most prescribed
- Methotrexate152 claims
- Prednisone136 claims
- Hydroxychloroquine Sulfate84 claims
- Alendronate Sodium64 claims
- Allopurinol52 claims
- Tramadol Hcl50 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 77.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $36.25
1 payment: food and beverage; the largest payer was Pacira Pharmaceuticals Incorporated. The 4,486 providers of this specialty with any payment received $8,538.33 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Arthritis And Rheumatism Associates PCFrederick, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin Peng among 57 rheumatology physician records in District of Columbia
Justin Peng, MD is one of 57 rheumatology physician records with a practice address in District of Columbia. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 54% of them.
- NPI issued2008 · 54% of these records are older, 37% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2005 · median 2006 among the 29 with a school on file
- Record last updated2026 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X 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).
Rheumatology Physician providers in District of Columbia
There are 57 rheumatology physician records in District of Columbia.
All 57 in District of Columbia → Every provider in Washington → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Werner Barth, M.D.Washington, DC 200061659370948
- Adey Berhanu, M.D.Washington, DC 200061417246091
- David Borenstein, MDWashington, DC 200061366441727
- Shari Diamond, M.D.Washington, DC 200061326165697
- Marc Phillpotts, M.D.Washington, DC 200061518300151
- Angus Worthing, MDWashington, DC 200061558534925
- Carol Deane Benedict, MDWashington, DC 200071356575864
- Thomas CuppsWashington, DC 200071336147206
Common questions
What is Justin Peng, MD's NPI number?
Justin Peng, MD's National Provider Identifier (NPI) is 1538328141, issued on Jun 9, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Justin Peng, MD located?
The NPPES record lists a practice address at 2021 K St NW, Washington, DC, 20006. Phone: (301) 942-7600. Providers update this record themselves, so call before visiting.
How can I verify Justin Peng, MD's license?
NPPES lists District of Columbia license number MD037073, 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 Justin Peng, MD prescribe under Medicare Part D?
In 2024, Justin Peng, MD had 1,077 Medicare Part D claims for 214 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Justin Peng, MD's MIPS final score?
The 2023 MIPS final score is 77.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.