Physician Profile
Unclaimed ProfileAbout GNANN
John W Gnann, MD practices internal medicine in Charleston, SC. John is a 1978 graduate of Duke University School of Medicine. John is also listed as specializing in infectious disease.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (843) 792-1414
- Email not available
Practice Locations
171 ASHLEY AVE
Charleston, SC 29425
Procedures Most Often Billed to Medicare
19 services · 19 patients · 1 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Telehealth consultation, emergency department or initial inpatient, typically 50 minutes communicating with the patient via telehealth | Billing code | G0426 |
19 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internal medicines at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 6
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 22 related providers in 3 groups
Other internal medicines in Charleston 7
Same specialty, same city.
Trained at Duke University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1978 at Duke University School of Medicine 7
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Dr. Gnann?
Dr. Gnann is an internal medicine in Charleston, SC. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “INTERNAL MEDICINE”.
NPI registry
What is Dr. Gnann's address?
Dr. Gnann is listed at 171 ASHLEY AVE, Charleston, SC 29425. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Gnann?
The number on file is (843) 792-1414. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Gnann?
Dr. Gnann's National Provider Identifier is 1467498659. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Gnann train?
Dr. Gnann attended Duke University School of Medicine, graduating in 1978. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Gnann have?
Dr. Gnann has 48 years experience. Calculated from a graduation year of 1978, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Gnann perform?
According to Medicare billing data, Dr. Gnann the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Gnann's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Gnann. If this is you, claiming it is free.
Guide.md
Is this your profile?
Verify your identity to control how patients — and AI assistants — describe you.
Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.