Tim Greten, M.D.
NPI 1518231000 · Hematology & Oncology Physician · Bethesda, MD
Enrolled with Medicare as Order and Referring Only - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tim Greten, M.D. is a Hematology & Oncology Physician provider in Bethesda, MD (NPI 1518231000).
Provider details
- NPI number
- 1518231000
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- D0048405 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
14 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,343 across 6 records (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
Registry dates
- Enumerated
- 2012-02-29
- Last updated
- 2012-02-29
Frequently asked questions
- What is Tim Greten's NPI number?
- Tim Greten's National Provider Identifier (NPI) is 1518231000, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tim Greten's specialty?
- Tim Greten is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Tim Greten located?
- Tim Greten's practice location on file with NPPES is Nci Building 10 Rm 12n226, Bethesda, MD 20892-0001.
- What is Tim Greten's phone number?
- The practice phone number listed in the NPPES registry for Tim Greten is (301) 451-4723.
- Does Tim Greten accept Medicare?
- Tim Greten is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tim Greten's NPI active?
- Yes — Tim Greten's NPI (1518231000) is active in the NPPES registry as of the last update on 2012-02-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.