Quick answers
- Does Yoon Jeong Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Yoon Jeong Chang 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 Yoon Jeong Chang see?
- In 2024, CMS data shows 72 Original Medicare patients and 246 services for Yoon Jeong Chang. This counts Original Medicare only and measures volume, not quality.
- What is Yoon Jeong Chang's NPI number?
- 1386859163. 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 Yoon Jeong Chang, 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 | 72 |
|---|---|
| Services billed to Medicare | 246 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Blood count, hemoglobin (85018)49 services
- Cervical or vaginal cancer screening; pelvic and clinical breast examination (G0101)40 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)36 services
- Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina (76830)28 services
- Automated urinalysis test (81003)23 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 cholesterol75%
- High blood pressure64%
- Arthritis49%
- Anxiety28%
- Diabetes24%
- Asthma24%
Hospitals where Yoon Jeong Chang works
Medicare's Facility Affiliation Data lists Yoon Jeong Chang at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Wellstar Cobb Medical CenterAustell, GA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 110143
- Wellstar Douglas Medical CenterDouglasville, GA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 110184
- Wellstar Kennestone Regional Medical CenterMarietta, GA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 110035
- Wellstar Paulding Medical CenterHiram, GA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 110042
Practice locations
Addresses where Yoon Jeong Chang is enrolled with Medicare (CMS data updated October 2, 2026).
- 3950 Austell RdAustell, GA 30106 (770) 732‑4022
- 4480 N Cooper Lake Rd SESmyrna, GA 30082
- 4480 N Cooper Lake SerdSmyrna, GA 30082
- 5150 Stilesboro N W Rd, Suite 220Kennesaw, GA 30152 (770) 424‑8222
Group practices
Medicare enrollment lists Yoon Jeong Chang as a member of this group (CMS data updated October 2, 2026).
- Wellstar Medical Group LLC3,093 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Austell
Clinicians with the same Medicare primary specialty in Austell, GA — not a recommendation.
Other clinicians in Wellstar Medical Group LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386859163 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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