Geoffrey V Martin, MD
Radiation Oncology (CMS) · Gaithersburg, MD
At a glance
808 W Diamond Ave Ste 650, Gaithersburg, MD 20878-1413
NPPES record updated May 27, 2026. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
808 W Diamond Ave Ste 650Gaithersburg, MD 20878-1413
Additional reported practice locations
3407 Wilkens Ave Ste 200Baltimore, MD 212295221
Phone: 4106440929 4305 Medical Center Dr Sage Cancer Center
Mchenry, IL 60050
Phone: 8153448000
Fax: 8153449601
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 2013
- CMS specialties
- Radiation Oncology
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
Reported hospital affiliations
- Northwestern Medicine Central Dupage Hospital Winfield, IL
- Northwestern Medicine Mchenry Mchenry, IL
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $482.33 |
Reporting companies
| Company | Amount |
|---|---|
| BAYER HEALTHCARE PHARMACEUTICALS INC. | $149.35 |
| IMMUNITYBIO, INC. | $135.17 |
| SUMITOMO PHARMA AMERICA, INC. | $50.38 |
| PFIZER INC. | $40.12 |
| NOVARTIS PHARMACEUTICALS CORPORATION | $36.92 |
| ASTELLAS PHARMA US INC | $36.00 |
| BIOPROTECT MEDICAL, INC. | $34.39 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Radiation Oncology (CMS)
- Taxonomy code
- 2085R0001X
- Enumeration date
- May 8, 2013
- Record updated
- May 27, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
2085R0001X
License reported: 036179546 IL
2085R0001X · Primary
License reported: D95725 MD
2085R0001X
License reported: 35.134191 OH
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
808 W Diamond Ave Ste 650Gaithersburg, MD 20878-1413
- Phone
- (240) 364-0900
Mailing address
25 CROSSROADS DR STE 306OWINGS MILLS, MD 211175437
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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