Jeffrey Grabenstein, M.D.
NPI 1639277494 · Family Medicine Physician · Oak Ridge, TN
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jeffrey Grabenstein, M.D. is a Family Medicine Physician provider in Oak Ridge, TN (NPI 1639277494).
Provider details
- NPI number
- 1639277494
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD0000030688 (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
19 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
733 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 278 | $79 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 197 | $108 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 159 | $9 |
| Administration of Influenza Virus VaccineG0008 | 37 | $30 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 20 | $119 |
| Automated Urinalysis Test81003 | 16 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 72 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 127 | 37 |
| Losartan Potassium | 72 | 20 |
| Liothyronine Sodium | 70 | 18 |
| Tamsulosin Hcl | 64 | 21 |
| Clonazepam | 62 | — |
| Azithromycin | 46 | 31 |
| Gabapentin | 40 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-20
- Last updated
- 2024-10-09
- Certified
- 2024-10-09
Frequently asked questions
- What is Jeffrey Grabenstein's NPI number?
- Jeffrey Grabenstein's National Provider Identifier (NPI) is 1639277494, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jeffrey Grabenstein's specialty?
- Jeffrey Grabenstein is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jeffrey Grabenstein located?
- Jeffrey Grabenstein's practice location on file with NPPES is 400 Laboratory Rd Ste 101, Oak Ridge, TN 37830-6808.
- What is Jeffrey Grabenstein's phone number?
- The practice phone number listed in the NPPES registry for Jeffrey Grabenstein is (865) 482-1692.
- Does Jeffrey Grabenstein accept Medicare?
- Jeffrey Grabenstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jeffrey Grabenstein's NPI active?
- Yes — Jeffrey Grabenstein's NPI (1639277494) is active in the NPPES registry as of the last update on 2024-10-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.