Doctor profile · Federal record
Dr. Justin Peng, MD
Rheumatology Physician (CMS: Rheumatology) · Rheumatology Physician · Rheumatology Physician · Washington, DC
- NPI 1538328141
- Accepts Medicare
- MIPS 77.1 / 100 · 2023
- 21 yrs in practice
- Licensed in 3 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
2021 K St Nw, Suite 300
Washington, DC 200061003
(301) 942-7600
fax (202) 419-0418 - Additional location
-
8270 Willow Oaks Corporate Dr Ste 150
Fairfax, VA 220314530
fax (703) 573-7767 - Mailing address
-
7361 Calhoun Pl Ste 600
Rockville, MD 208552788
Credentials & registration
- NPI registered
- June 2008 — 18 yrs on file
- Profile last updated
- February 5, 2026
- Year of graduation
- 2005 — 21 yrs since
- Specialty taxonomy
- 207RR0500X — NUCC code
- State licenses (3)
- District of Columbia #MD037073 · Virginia #0101242489 · Maryland #D0072143
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1538328141. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
41,008
Distinct HCPCS
10
Medicare allowed
$621,583
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J3262 |
Injection, tocilizumab, 1 mg | 20,960 | 16 | $6 | |
J3111 |
Injection, romosozumab-aqqg, 1 mg | 8,610 | 15 | $10 | |
J0897 |
Injection, denosumab, 1 mg | 5,820 | 81 | $23 | |
J1745 |
Injection, infliximab, excludes biosimilar, 10 mg | 960 | 14 | $33 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 744 | 343 | $145 | |
36415 |
Insertion of needle into vein for collection of blood sample | 441 | 265 | $8 | |
80053 |
Blood test, comprehensive group of blood chemicals | 390 | 243 | $10 | |
86140 |
Measurement c-reactive protein for detection of infection or inflammation | 322 | 185 | $5 | |
85025 |
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 275 | 188 | $8 | |
85652 |
Red blood cell sedimentation rate, to detect inflammation, automated | 236 | 153 | $3 |
In context: peer comparison
Among 18 peers in this city , average services per provider: 428. This provider delivers 96× the peer median.Open Payments
Industry payments received
All-time total
$36
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Pacira Pharmaceuticals Incorporated | 1 | $36.25 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
547
Patients
102
Total drug cost
$627,677
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Methotrexate (Methotrexate Sodium) | Brand | 97 | 23 | $3,303 |
| Prednisone | Generic | 96 | 31 | $1,280 |
| Alendronate Sodium | Generic | 61 | 21 | $686 |
| Hydroxychloroquine Sulfate | Generic | 43 | 14 | $2,986 |
| Allopurinol | Generic | 38 | 13 | $750 |
| Humira(Cf) Pen (Adalimumab) | Brand | 30 | 0 | $344,803 |
| Gabapentin | Generic | 25 | 0 | $555 |
| Meloxicam | Generic | 25 | 0 | $123 |
| Enbrel Sureclick (Etanercept) | Brand | 24 | 0 | $263,081 |
| Tramadol Hcl | Generic | 24 | 0 | $238 |
Frequently asked questions
What is Dr. Justin Peng's medical specialty?
Dr. Justin Peng practices Rheumatology Physician in Washington, DC.
Where does Dr. Justin Peng practice?
Dr. Justin Peng practices at 2021 K St Nw, Washington, DC 200061003. Office phone: 3019427600.
What is Dr. Justin Peng's NPI?
Dr. Justin Peng's National Provider Identifier (NPI) is 1538328141, issued by NPPES.
Does Dr. Justin Peng accept Medicare assignment?
Yes. Dr. Justin Peng accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Justin Peng commonly perform?
Top Medicare-reported procedures in 2023: Injection, tocilizumab, 1 mg (HCPCS J3262); Injection, romosozumab-aqqg, 1 mg (HCPCS J3111); Injection, denosumab, 1 mg (HCPCS J0897). Source: CMS Medicare Physician & Other Practitioners file.