David Chyan, DMD
David Chyan, DMD is a provider specialising in General Practice Dentistry in Marietta, GA, registered under NPI 1003546656. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Marietta, based on OpenStreetMap data collected Oct 5, 2026. Parking is available about 369 ft away. There is EV charging 0.33 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 0.29 mi away. A pharmacy sits 0.20 mi from the entrance (Publix Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.45 mi away.
Getting here and what is nearby
Pharmacy CVS Pharmacy 8 ft ~1 min
Parking 113 ft ~1 min
Restaurant Willy's Mexicana Grill 88 ft ~1 min
4250 Roswell Road, Marietta 30062
Mo-Sa 11:00-22:00; Su 11:00-21:00
Grocery Trader Joe's 154 ft ~1 min
4250 Roswell Road, Marietta 30062
Mo-Su 08:00-21:00
Gas station BP 342 ft ~2 min
4267 Roswell Road, Marietta 30062
Mo-Su 06:00-23:00
Restaurant Howlin' Willy's Hot Chicken 318 ft ~2 min
Convenience BP To Go 356 ft ~2 min
4267 Roswell Road, Marietta 30062
Mo-Su 06:00-23:00
Parking 346 ft ~2 min
Parking 369 ft ~2 min
Restaurant Chopt Creative Salad Co. 363 ft ~2 min
4250 Roswell Road, 30062
Mo-Sa 10:30-20:00; Su 11:00-20:00
Convenience Chevron Food Mart 567 ft ~3 min
Transit 624 ft ~3 min
Gas station Chevron 608 ft ~3 min
EV charging EVgo 871 ft ~4 min
Transit 1,015 ft ~4 min
Pharmacy Target Pharmacy 1,023 ft ~4 min
1401 Johnson Ferry Road Northeast, Marietta 30062
Mo-Sa 08:00-22:00; Su 08:00-21:00
Pharmacy Publix Pharmacy 0.20 mi ~4 min
4269 Roswell Road, Marietta 30062
Mo-Fr 09:00-21:00; Sa 09:00-19:00; Su 11:00-18:00
Grocery Publix 0.20 mi ~5 min
4269 Roswell Road, Marietta 30062
Mo-Su 07:00-22:00
Grocery Whole Foods Market 0.20 mi ~5 min
1311 Johnson Ferry Road Northeast, Marietta 30068
Mo-Su 08:00-21:00
Transit 0.29 mi ~6 min
EV charging Tesla Supercharger 0.33 mi ~7 min
EV charging Tesla Supercharger 0.33 mi ~7 min
Coffee Bagelicious 0.34 mi ~7 min
1255 Johnson Ferry Road Northeast, Marietta 30068
Mo-Su 06:00-16:00
Coffee Yogli Mogli 0.34 mi ~7 min
1255 Johnson Ferry Road Northeast, Marietta 30068
Mo-Su 12:00-22:00
Coffee Vanilla Café Gelato 0.45 mi ~9 min
4475 Roswell Road, Marietta 30062
Mo-Th 10:00-20:00; Fr,Sa 10:00-21:00; Su 12:00-18:00
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| DN122709 | GA | General Practice Dentistry primary |
This provider holds licence DN122709 issued in GA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What General Practice covers
A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs. NUCC Health Care Provider Taxonomy, code 1223G0001X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003546656 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 15, 2022 |
| Last updated | Jun 15, 2022 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | DMD |
| Practice address |
4250 ROSWELL RD STE 110 Marietta, GA 30062 (770) 509-5585 |
| Mailing address |
10855 GLENHURST PASS Duluth, GA 30097 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 5 | 4 | 6 | 6 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 4 | 3 | 6 | 1 |
Sum = 44 · next multiple of 10 = 50 · check digit = 6 · actual last digit = 6
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.