Quick answers
- Which hospitals does John Clark work at?
- Medicare's official clinician data lists John Clark at 5 hospitals: Athens Limestone Hospital, Helen Keller Hospital, Highlands Medical Center, Huntsville Hospital and Marshall Medical Centers. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Clark see patients?
- Medicare's clinician data lists 3 practice locations, including Huntsville, AL and Hunstville, AL. Call before your visit to confirm the address.
- What is John Clark's specialty?
- Medicare lists Nephrology as the primary specialty.
- Does John Clark accept Medicare assignment?
- Yes. Medicare's clinician data says John Clark 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 John Clark?
- (256) 535-5008, as listed in official Medicare / NPI Registry data.
- What is John Clark's NPI number?
- 1578631784. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John Clark works
Medicare's Facility Affiliation Data lists John Clark at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Athens Limestone HospitalAthens, AL · Acute Care Hospital · CCN 010079
- Helen Keller HospitalSheffield, AL · Acute Care Hospital · CCN 010019
- Highlands Medical CenterScottsboro, AL · Acute Care Hospital · CCN 010061
- Huntsville HospitalHuntsville, AL · Acute Care Hospital · CCN 010039
- Marshall Medical CentersBoaz, AL · Acute Care Hospital · CCN 010005
Practice locations
Addresses where John Clark is enrolled with Medicare (CMS data updated 2026-10-02).
- 1311 Memorial Pkwy NW, Suite 300Huntsville, AL 35801 (256) 535‑5008
- 2780 Bob Wallace AveHunstville, AL 35805 (256) 533‑4626
- 2780 Bob Wallace Ave SWHuntsville, AL 35805
Group practices
Medicare enrollment lists John Clark as a member of these groups (CMS data updated 2026-10-02).
- Nephrology Consultants LLC17 clinicians in the group
- North Alabama Vascular and Dialysis Access Care LLC4 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Huntsville
Clinicians with the same Medicare primary specialty in Huntsville, AL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Alabama School Of Medicine |
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578631784 |
| 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