Doctor profile · Federal record
Dr. John Gnann, MD
Infectious Disease Physician (CMS: Internal Medicine) · Infectious Disease Physician · Charleston, SC
- NPI 1467498659
- Accepts Medicare
- 48 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
171 Ashley Ave
Charleston, SC 294258908
(843) 792-1414 - Mailing address
-
Po Box 751461
Charlotte, NC 282751461
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- October 22, 2020
- Year of graduation
- 1978 — 48 yrs since
- Specialty taxonomy
- 207RI0200X — NUCC code
- State licenses (2)
- South Carolina #AL35447 · Alabama #08890
- Medicaid
- AL #000080315
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1467498659. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
114
Distinct HCPCS
4
Medicare allowed
$10,392
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 55 | 29 | $75 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 27 | 24 | $91 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 19 | 19 | $123 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 13 | 11 | $113 |
In context: peer comparison
Among 15 peers in Charleston Infectious Disease Physician, average services per provider: 95. This provider delivers 1.2× the peer median.Open Payments
Industry payments received
All-time total
$7,500
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| BioCryst Pharmaceuticals, INC. | 1 | $7,500.00 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
320
Patients
0
Total drug cost
$829,132
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Biktarvy (Bictegrav/Emtricit/Tenofov Ala) | Brand | 46 | 0 | $199,950 |
| Genvoya (Elviteg/Cob/Emtri/Tenof Alafen) | Brand | 39 | 0 | $156,411 |
| Symtuza (Darunavir/Cob/Emtri/Tenof Alaf) | Brand | 35 | 0 | $171,040 |
| Triumeq (Abacavir/Dolutegravir/Lamivudi) | Brand | 32 | 0 | $121,016 |
| Rosuvastatin Calcium | Generic | 30 | 0 | $179 |
| Amlodipine Besylate | Generic | 19 | 0 | $117 |
| Doxycycline Hyclate | Generic | 16 | 0 | $1,569 |
| Tivicay (Dolutegravir Sodium) | Brand | 15 | 0 | $34,200 |
| Bupropion Xl (Bupropion Hcl) | Brand | 14 | 0 | $89 |
| Posaconazole | Generic | 14 | 0 | $100,925 |
Frequently asked questions
What is Dr. John Gnann's medical specialty?
Dr. John Gnann practices Infectious Disease Physician in Charleston, SC.
Where does Dr. John Gnann practice?
Dr. John Gnann practices at 171 Ashley Ave, Charleston, SC 294258908. Office phone: 8437921414.
What is Dr. John Gnann's NPI?
Dr. John Gnann's National Provider Identifier (NPI) is 1467498659, issued by NPPES.
Does Dr. John Gnann accept Medicare assignment?
Yes. Dr. John Gnann accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Gnann commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Established patient office or other outpatient visit (HCPCS 99214); Initial hospital care with straightforward or low-level medical decision making (HCPCS 99222). Source: CMS Medicare Physician & Other Practitioners file.