Doctor profile · Federal record
Dr. John Marshall
Hematology & Oncology Physician (CMS: Hematology/Oncology) · Washington, DC
- NPI 1316935844
- Accepts Medicare
- MIPS 76.3 / 100 · 2023
- 38 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3800 Reservoir RD Nw
Washington, DC 200072113
(202) 444-2223 - Mailing address
-
Po Box 418283
Boston, MA 022418283
Credentials & registration
- NPI registered
- October 2005 — 21 yrs on file
- Profile last updated
- March 9, 2012
- Year of graduation
- 1988 — 38 yrs since
- Specialty taxonomy
- 207RH0003X — NUCC code
- State license (1)
- District of Columbia #19655
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1316935844. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
319
Distinct HCPCS
4
Medicare allowed
$47,467
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 229 | 52 | $159 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 53 | 38 | $106 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 21 | 21 | $202 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 16 | 12 | $73 |
In context: peer comparison
Among 17 peers in Washington Hematology & Oncology Physician, average services per provider: 881. This provider delivers 0.4× the peer median.Open Payments
Industry payments received
All-time total
$29,847
Transactions
19
Manufacturers
6
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Pfizer INC. | 11 | $17,788.42 | |
| Mirati Therapeutics, INC. | 1 | $6,650.00 | |
| Amgen INC. | 3 | $2,596.00 | |
| Taiho Oncology, INC. | 2 | $2,310.00 | |
| Takeda Pharmaceuticals U.S.A., INC. | 1 | $435.00 | |
| Intera Oncology, INC | 1 | $67.36 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
40
Patients
0
Total drug cost
$674
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Ondansetron Hcl | Generic | 16 | 0 | $250 |
| Dexamethasone | Generic | 13 | 0 | $343 |
| Lorazepam | Generic | 11 | 0 | $80 |
Hospital affiliations
Frequently asked questions
What is Dr. John Marshall's medical specialty?
Dr. John Marshall practices Hematology & Oncology Physician in Washington, DC.
Where does Dr. John Marshall practice?
Dr. John Marshall practices at 3800 Reservoir RD Nw, Washington, DC 200072113. Office phone: 2024442223.
What is Dr. John Marshall's NPI?
Dr. John Marshall's National Provider Identifier (NPI) is 1316935844, issued by NPPES.
Does Dr. John Marshall accept Medicare assignment?
Yes. Dr. John Marshall accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Marshall commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99215); Established patient office or other outpatient visit (HCPCS 99214); New patient office or other outpatient visit (HCPCS 99205). Source: CMS Medicare Physician & Other Practitioners file.