Physician Profile
Unclaimed ProfileAbout MARSHALL
John Lindsay Marshall is a healthcare provider in Washington, DC specialising in hematology/oncology. John trained at University of Louisville School of Medicine, graduating in 1988. John is also listed as specialising in hematology & oncology.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Marshall?
Dr. Marshall is a hematology/oncology in Washington, DC. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “HEMATOLOGY/ONCOLOGY”.
NPI registry
What is Dr. Marshall's address?
Dr. Marshall is listed at 3800 RESERVOIR RD NW, Washington, DC 20007. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Marshall?
The number on file is (202) 444-2223. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Marshall's NPI number?
Dr. Marshall's National Provider Identifier is 1316935844. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Marshall train?
Dr. Marshall attended University of Louisville School of Medicine, graduating in 1988. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Marshall been practising?
Dr. Marshall has 38 years experience. Calculated from a graduation year of 1988, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Marshall perform?
According to Medicare billing data, Dr. Marshall the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Marshall confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Marshall. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (202) 444-2223
- Email not available
Practice Locations
3800 RESERVOIR RD NW
Washington, DC 20007
Procedures Most Often Billed to Medicare
324 services · 156 patients · 6 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
188 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
44 |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
27 |
| 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' | Billing code | G2211 |
26 |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
23 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
16 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other hematology/oncology specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Other hematology/oncology specialists in Washington 8
Same specialty, same city.
Trained at University of Louisville School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1988 at University of Louisville School of Medicine 8
Providers who graduated from the same medical school in the same year.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.