Quick answers
- Which hospitals does Sergio A. Diaz work at?
- Medicare's official clinician data lists Sergio A. Diaz at 3 hospitals: Franklin Woods Community Hospital, Johnson City Medical Center and Sycamore Shoals Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sergio A. Diaz see patients?
- Medicare's clinician data lists 1 practice location in Johnson City, TN. Call before your visit to confirm the address.
- What is Sergio A. Diaz's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Sergio A. Diaz accept Medicare assignment?
- Yes. Medicare's clinician data says Sergio A. Diaz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Sergio A. Diaz?
- (423) 794-5500, as listed in official Medicare / NPI Registry data.
- What is Sergio A. Diaz's NPI number?
- 1417138439. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sergio A. Diaz works
Medicare's Facility Affiliation Data lists Sergio A. Diaz at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Franklin Woods Community HospitalJohnson City, TN · Acute Care Hospital · CCN 440184
- Johnson City Medical CenterJohnson City, TN · Acute Care Hospital · CCN 440063
- Sycamore Shoals HospitalElizabethton, TN · Acute Care Hospital · CCN 440018
Practice locations
Addresses where Sergio A. Diaz is enrolled with Medicare (CMS data updated 2026-10-02).
- 301 Med Tech PkwyJohnson City, TN 37604 (423) 794‑5500
Group practices
Medicare enrollment lists Sergio A. Diaz as a member of this group (CMS data updated 2026-10-02).
- State of Franklin Healthcare Associates, PLLC249 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Johnson City
Clinicians with the same Medicare primary specialty in Johnson City, TN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417138439 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians