William Grabenstein, M.D.
NPI 1003013160 · Family Medicine Physician · Clarksville, TN
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grabenstein, M.D. is a Family Medicine Physician provider in Clarksville, TN (NPI 1003013160).
Provider details
- NPI number
- 1003013160
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD017935 (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
1,143 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 486 | $111 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 187 | $12 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 83 | $78 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 79 | $47 |
| Administration of Influenza Virus VaccineG0008 | 76 | $29 |
| Urinalysis, Manual Test81002 | 48 | $3 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 110 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 252 | 51 |
| Prednisone | 224 | 87 |
| Atorvastatin Calcium | 223 | 49 |
| Alprazolam | 203 | 30 |
| Azithromycin | 151 | 81 |
| Gabapentin | 148 | 20 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-06-29
- Last updated
- 2015-07-29
Frequently asked questions
- What is William Grabenstein's NPI number?
- William Grabenstein's National Provider Identifier (NPI) is 1003013160, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grabenstein's specialty?
- William Grabenstein is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Grabenstein located?
- William Grabenstein's practice location on file with NPPES is 1822 Memorial Dr, Clarksville, TN 37043-4605.
- What is William Grabenstein's phone number?
- The practice phone number listed in the NPPES registry for William Grabenstein is (931) 552-8012.
- Does William Grabenstein accept Medicare?
- William Grabenstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grabenstein's NPI active?
- Yes — William Grabenstein's NPI (1003013160) is active in the NPPES registry as of the last update on 2015-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.