Grant Clark, M.D.
NPI 1700029626 · Radiation Oncology Physician · Knoxville, TN
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grant Clark, M.D. is a Radiation Oncology Physician provider in Knoxville, TN (NPI 1700029626).
Provider details
- NPI number
- 1700029626
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 51020 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,050 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 796 | $43 |
| Design and Construction of Complex Radiation Treatment Device77334 | 448 | $59 |
| Calculation of Radiation Therapy Dose77300 | 445 | $32 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 261 | $182 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 189 | $88 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 150 | $124 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 67 | 29 |
| Dexamethasone | 46 | 29 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 36 | 19 |
| Pantoprazole Sodium | 35 | 19 |
| Sucralfate | 33 | 26 |
| Lorazepam | 21 | 19 |
| Ondansetron Hcl | 21 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-04-07
- Last updated
- 2026-05-18
- Certified
- 2026-05-18
Frequently asked questions
- What is Grant Clark's NPI number?
- Grant Clark's National Provider Identifier (NPI) is 1700029626, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Clark's specialty?
- Grant Clark is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Grant Clark located?
- Grant Clark's practice location on file with NPPES is 1915 White Avenue, Knoxville, TN 37916-2399.
- What is Grant Clark's phone number?
- The practice phone number listed in the NPPES registry for Grant Clark is (865) 331-1155.
- Does Grant Clark accept Medicare?
- Grant Clark is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grant Clark's NPI active?
- Yes — Grant Clark's NPI (1700029626) is active in the NPPES registry as of the last update on 2026-05-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.