William Drinnon, MD
NPI 1831174168 · Internal Medicine Physician · Chattanooga, TN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Drinnon, MD is a Internal Medicine Physician provider in Chattanooga, TN (NPI 1831174168).
Provider details
- NPI number
- 1831174168
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 22164 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,762 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,036 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 747 | $118 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 603 | $84 |
| Blood Test, Basic Group of Blood Chemicals (calcium, Total)80048 | 537 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 306 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 256 | $13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 92 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 633 | 176 |
| Levothyroxine Sodium | 327 | 84 |
| Losartan Potassium | 268 | 73 |
| Atorvastatin Calcium | 243 | 65 |
| Lisinopril | 240 | 69 |
| Omeprazole | 211 | 62 |
| Rosuvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$146 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-09
- Last updated
- 2009-01-15
Frequently asked questions
- What is William Drinnon's NPI number?
- William Drinnon's National Provider Identifier (NPI) is 1831174168, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Drinnon's specialty?
- William Drinnon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Drinnon located?
- William Drinnon's practice location on file with NPPES is 3370 Jenkins Road, Chattanooga, TN 37421.
- What is William Drinnon's phone number?
- The practice phone number listed in the NPPES registry for William Drinnon is (423) 648-8005.
- Does William Drinnon accept Medicare?
- William Drinnon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Drinnon's NPI active?
- Yes — William Drinnon's NPI (1831174168) is active in the NPPES registry as of the last update on 2009-01-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.