Justin Peng, MD
NPI 1538328141 · Rheumatology Physician · Washington, DC
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Peng, MD is a Rheumatology Physician provider in Washington, DC (NPI 1538328141).
Provider details
- NPI number
- 1538328141
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0101242489 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
5,793 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 834 | $18 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 713 | $140 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 471 | $10 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 458 | $9 |
| Measurement C-Reactive Protein for Detection of Infection Or Inflammation86140 | 390 | $5 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 152 | 34 |
| Prednisone | 136 | 46 |
| Hydroxychloroquine Sulfate | 84 | 24 |
| Alendronate Sodium | 64 | 22 |
| Allopurinol | 52 | 18 |
| Tramadol Hcl | 50 | — |
| Celecoxib | 45 | 17 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$36 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 8270 Willow Oaks Corporate Dr Ste 150Fairfax, VA 22031-4530Phone: (301) 942-7600Fax: (703) 573-7767
Registry dates
- Enumerated
- 2008-06-09
- Last updated
- 2026-02-05
- Certified
- 2026-02-05
Frequently asked questions
- What is Justin Peng's NPI number?
- Justin Peng's National Provider Identifier (NPI) is 1538328141, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Peng's specialty?
- Justin Peng is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Peng located?
- Justin Peng's practice location on file with NPPES is 2021 K St Nw, Washington, DC 20006-1003.
- What is Justin Peng's phone number?
- The practice phone number listed in the NPPES registry for Justin Peng is (301) 942-7600.
- Does Justin Peng accept Medicare?
- Justin Peng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Peng's NPI active?
- Yes — Justin Peng's NPI (1538328141) is active in the NPPES registry as of the last update on 2026-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.