Clayton Patrick Smith, MD
Radiation Oncology (CMS) · Portsmouth, NH
At a glance
121 Corporate Dr, Portsmouth, NH 03801-6895
Published activity: Colonoscopy. View counts and coverage
NPPES record updated Jul 22, 2025. 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
121 Corporate DrPortsmouth, NH 03801-6895
Additional reported practice locations
1000 W Carson StTorrance, CA 905022004
Phone: 3035138943 41 Mall Rd Burlington
Burlington, MA 018052004
Phone: 7817448780 200 Medical Plaza Suite B265
Los Angeles, CA 900952004
Phone: 3108259775
Education & affiliations
- Medical / professional school
- Georgetown University School Of Medicine
- Graduation year
- 2019
- CMS specialties
- Radiation Oncology
Practice groups
Reported hospital affiliations
- Concord Hospital Concord, NH
- Elliot Hospital Manchester, NH
- Mary Hitchcock Memorial Hospital Lebanon, NH
- Wentworth-Douglass Hospital Dover, NH
- York Hospital York, ME
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.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 1-10 |
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
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
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
- Mar 25, 2019
- Record updated
- Jul 22, 2025
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
2085R0001X
License reported: 1017867 MA
208D00000X
License reported: A180474 CA
390200000X
2085R0001X · Primary
License reported: 25062 NH
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
121 Corporate DrPortsmouth, NH 03801-6895
- Phone
- (603) 230-6100
Mailing address
217 S BARRINGTON AVE APT 103LOS ANGELES, CA 900493331
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue