Mark Greene, M.D.
NPI 1801045638 · Medical Oncology Physician · Rockville, MD
Mark Greene, M.D. is a Medical Oncology Physician provider in Rockville, MD (NPI 1801045638).
Provider details
- NPI number
- 1801045638
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0022149 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-09-17
- Last updated
- 2008-09-17
Frequently asked questions
- What is Mark Greene's NPI number?
- Mark Greene's National Provider Identifier (NPI) is 1801045638, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Greene's specialty?
- Mark Greene is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Greene located?
- Mark Greene's practice location on file with NPPES is 6120 Executive Blvd, Rockville, MD 20852-4906.
- What is Mark Greene's phone number?
- The practice phone number listed in the NPPES registry for Mark Greene is (301) 594-7641.
- Is Mark Greene's NPI active?
- Yes — Mark Greene's NPI (1801045638) is active in the NPPES registry as of the last update on 2008-09-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.