Quick answers
- Does Hisa Yamaguchi accept Medicare assignment?
- Yes. Medicare's clinician data says Hisa Yamaguchi 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 Hisa Yamaguchi see?
- In 2024, CMS data shows 121 Original Medicare patients and 265 services for Hisa Yamaguchi. This counts Original Medicare only and measures volume, not quality.
- What is Hisa Yamaguchi's NPI number?
- 1538161195. 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 Hisa Yamaguchi, 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 | 121 |
|---|---|
| Services billed to Medicare | 265 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)95 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)32 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)29 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)24 services
- Partial removal of breast (19301)14 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 pressure69%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)69%
- Arthritis45%
- Diabetes30%
- Anxiety24%
Hospitals where Hisa Yamaguchi works
Medicare's Facility Affiliation Data lists Hisa Yamaguchi 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.
- Northside Hospital DuluthDuluth, GA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 110252
- Northside Hospital GwinnettLawrenceville, GA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 110087
- Piedmont Eastside Medical CenterSnellville, GA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 110192
- Piedmont Rockdale HospitalConyers, GA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 110091
Practice locations
Addresses where Hisa Yamaguchi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1700 Tree Ln, Suite 320Snellville, GA 30078 (770) 972‑7999
Group practices
Medicare enrollment lists Hisa Yamaguchi as a member of this group (CMS data updated October 2, 2026).
- Piedmont Providers LLC530 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Snellville
Clinicians with the same Medicare primary specialty in Snellville, GA — not a recommendation.
Other clinicians in Piedmont Providers LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Hahnemann University College Of Medicine |
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538161195 |
| 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