Sergio Diaz, MD
NPI 1417138439 · Internal Medicine Physician · Johnson City, TN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sergio Diaz, MD is a Internal Medicine Physician provider in Johnson City, TN (NPI 1417138439).
Provider details
- NPI number
- 1417138439
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 43908 (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
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
948 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 512 | $109 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 170 | $105 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 132 | $72 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 85 | $159 |
| Critical Care, First 30-74 Minutes99291 | 23 | $195 |
| Advance Care Planning, First 30 Minutes99497 | 15 | $69 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefdinir | 112 | 110 |
| Ondansetronbrand: Ondansetron Odt | 77 | 74 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 51 | 51 |
| Prednisone | 45 | 41 |
| Furosemide | 27 | 16 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 26 | 25 |
| Apixaban |
Practice location
Mailing address
Additional practice locations (1)
- 444 Clinchfield St Ste 201Kingsport, TN 37660-3863Phone: (423) 230-2100Fax: (423) 230-2112
Registry dates
- Enumerated
- 2007-11-19
- Last updated
- 2025-02-14
- Certified
- 2025-02-14
Frequently asked questions
- What is Sergio Diaz's NPI number?
- Sergio Diaz's National Provider Identifier (NPI) is 1417138439, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sergio Diaz's specialty?
- Sergio Diaz is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sergio Diaz located?
- Sergio Diaz's practice location on file with NPPES is 301 Med Tech Pkwy Ste 240, Johnson City, TN 37604-2641.
- What is Sergio Diaz's phone number?
- The practice phone number listed in the NPPES registry for Sergio Diaz is (423) 794-5520.
- Does Sergio Diaz accept Medicare?
- Sergio Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sergio Diaz's NPI active?
- Yes — Sergio Diaz's NPI (1417138439) is active in the NPPES registry as of the last update on 2025-02-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.