Quick answers
- Does John W. Gnann Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says John W. Gnann Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does John W. Gnann Jr. see?
- In 2024, CMS data shows 39 Original Medicare patients and 44 services for John W. Gnann Jr.. This counts Original Medicare only and measures volume, not quality.
- What is John W. Gnann Jr.'s NPI number?
- 1467498659. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for John W. Gnann Jr., data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 39 |
|---|---|
| Services billed to Medicare | 44 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Telehealth consultation, emergency department or initial inpatient, typically 50 minutes communicating with the patient via telehealth (G0426)19 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis62%
- Diabetes59%
- Chronic kidney disease59%
- Heart failure56%
Practice locations
Addresses where John W. Gnann Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 171 Ashley AveCharleston, SC 29425 (843) 792‑1414
Group practices
Medicare enrollment lists John W. Gnann Jr. as a member of this group (CMS data updated October 2, 2026).
- University Medical Associates of the Medical University of South Carol1,668 clinicians in the group
Specialties
- Internal Medicineprimary
- Infectious Diseasealso
Other internal medicine doctors in Charleston
Clinicians with the same Medicare primary specialty in Charleston, SC — not a recommendation.
Other clinicians in University Medical Associates of the Medical University of South Carol
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1978 (48 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1467498659 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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