Clifford Williamson, MD
NPI 1154562304 · Emergency Medicine Physician · Johnson City, TN
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clifford Williamson, MD is a Emergency Medicine Physician provider in Johnson City, TN (NPI 1154562304).
Provider details
- NPI number
- 1154562304
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0101282637 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 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
2,152 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 1,762 | $73 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 207 | $159 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 183 | $105 |
Typical Medicare-allowed amounts for these services range $73–$159 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 53 | 52 |
| Levothyroxine Sodium | 42 | 15 |
| Metoprolol Tartrate | 42 | 38 |
| Pantoprazole Sodium | 40 | 34 |
| Amlodipine Besylate | 38 | 37 |
| Furosemide | 34 | 32 |
| Lisinopril | 31 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 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
- 2009-03-18
- Last updated
- 2025-04-29
- Certified
- 2025-04-29
Frequently asked questions
- What is Clifford Williamson's NPI number?
- Clifford Williamson's National Provider Identifier (NPI) is 1154562304, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clifford Williamson's specialty?
- Clifford Williamson is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Clifford Williamson located?
- Clifford Williamson's practice location on file with NPPES is 325 N State of Franklin Rd, Johnson City, TN 37604-6062.
- What is Clifford Williamson's phone number?
- The practice phone number listed in the NPPES registry for Clifford Williamson is (423) 439-6283.
- Does Clifford Williamson accept Medicare?
- Clifford Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clifford Williamson's NPI active?
- Yes — Clifford Williamson's NPI (1154562304) is active in the NPPES registry as of the last update on 2025-04-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.