William Grabenstein, M.D.
William Grabenstein, M.D. is a Family Medicine Physician in Clarksville, TN, registered under NPI 1003013160. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Clarksville, based on OpenStreetMap data collected Aug 29, 2026. Parking is available about 0.50 mi away. The nearest transit stop is 659 ft away, served by Med Park Drive.
Getting here and what is nearby
Transit West Park Drive 57 ft ~1 min
Transit Medical Court 429 ft ~2 min
Parking 539 ft ~3 min
Transit Med Park Drive 659 ft ~3 min
Restaurant Tropical Smoothie Cafe 0.36 mi ~8 min
Restaurant McDonald's 0.45 mi ~10 min
1921 Madison Extension, Clarksville 37040
05:00-23:00
Grocery Publix 0.47 mi ~10 min
1771 Madison Street, Clarksville 37043-4990
Mo-Su 07:00-22:00
Parking 0.50 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| MD017935 | TN | Family Medicine Physician primary |
This provider holds licence MD017935 issued in TN. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Family Practice
- PAC ID
- 6103863931
- Enrollment ID
- I20050419001400
Medicare enrolment is recorded as approved under the provider type Practitioner - Family Practice. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Family Medicine covers
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity. NUCC Health Care Provider Taxonomy, code 207Q00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003013160 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 29, 2007 |
| Last updated | Jul 29, 2015 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
1822 MEMORIAL DR Clarksville, TN 37043 (931) 552-8012 Fax (931) 551-3118 |
| Other identifiers |
3728817
· Other (TN) 3728817 · Medicaid (TN) 4102307 · Other (TN) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 0 | 1 | 3 | 1 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 1 | 6 | 1 | 3 |
Sum = 40 · next multiple of 10 = 40 · check digit = 0 · actual last digit = 0
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.