Dr. Mark A. Chastain, MD
Dermatology (Dermatology Physician)
- Medicare participating
At a glance
- Years since graduation
- 30
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 1,350
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Dermatology Physician primary
GA license 048995 -
MOHS-Micrographic Surgery Physician
GA license 048995
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Medical groups
- Aqua Dermatology of Georgia PC (58 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 1,350
- Services billed
- 7,034
- Patients’ average age
- 76
| Service | Times | Patients |
|---|---|---|
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks | 986 | 470 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks | 979 | 755 |
| Aminolevulinic acid hcl for topical administration, 20%, single unit dosage form (354 mg) | 857 | 506 |
| Application of light to destroy precancer skin growth | 732 | 505 |
| Complicated repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet, 2.6-7.5 cm | 382 | 358 |
| Removal and microscopic exam of growth of trunk, arms, or legs, 1-5 tissue blocks | 326 | 245 |
| Complicated repair of wound of scalp, arms, or legs, 2.6-7.5 cm | 268 | 245 |
| Superficial and/or low voltage radiation treatment delivery | 192 | 12 |
| Removal and microscopic exam of growth of trunk, arms, or legs, each additional stage, 1-5 tissue blocks | 191 | 128 |
| Pathology examination of specimen during surgery, first tissue block | 165 | 111 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Cephalexin Other prescribers in Marietta, GA | 1,484 |
| Tramadol Hcl Other prescribers in Marietta, GA | 947 |
| Doxycycline Hyclate Other prescribers in Marietta, GA | 247 |
| Hydrocodone-Acetaminophen (hydrocodone/acetaminophen) Other prescribers in Marietta, GA | 122 |
| Mupirocin Other prescribers in Marietta, GA | 77 |
| Valacyclovir (valacyclovir hcl) Other prescribers in Marietta, GA | 54 |
| Fluorouracil Other prescribers in Marietta, GA | 26 |
| Ketoconazole Other prescribers in Marietta, GA | 24 |
| Acetaminophen-Codeine (acetaminophen with codeine) Other prescribers in Marietta, GA | 23 |
| Fluconazole Other prescribers in Marietta, GA | 21 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 11 companies reported 24 payments worth $1,137 in total to this clinician.
| AbbVie Inc. | $786 |
|---|---|
| Regeneron Healthcare Solutions, Inc. | $98.35 |
| Genzyme Corporation | $49.98 |
| Pfizer Inc. | $41.85 |
| Mayne Pharma Commercial LLC | $35.29 |
| UCB, Inc. | $33.42 |
| Ortho Dermatologics, A Division of Bausch Health US, LLC | $19.61 |
| Galderma Laboratories, L.P. | $19.45 |
| Compensation for services other than consulting (speaking, faculty) | $693 |
|---|---|
| Food and Beverage | $345 |
| Education | $98.35 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| AbbVie Inc. Oct 8, 2025 | Compensation for services other than consulting (speaking, faculty) | $186 |
| AbbVie Inc. Mar 7, 2025 | Compensation for services other than consulting (speaking, faculty) | $184 |
| AbbVie Inc. May 2, 2025 | Compensation for services other than consulting (speaking, faculty) | $158 |
| AbbVie Inc. Apr 7, 2025 | Compensation for services other than consulting (speaking, faculty) | $121 |
| Regeneron Healthcare Solutions, Inc. Nov 20, 2025 | Education DUPIXENT · IMMUNOLOGY AND INFLAMMATION · in-kind | $98.35 |
| AbbVie Inc. Dec 18, 2025 | Compensation for services other than consulting (speaking, faculty) | $31.80 |
| AbbVie Inc. Jan 7, 2025 | Compensation for services other than consulting (speaking, faculty) | $11.50 |
| AbbVie Inc. Sep 16, 2025 | Compensation for services other than consulting (speaking, faculty) | $1.00 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.