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Medigap in ZIP code 99328, Dayton area
By Vadim Marusin, licensed Medicare insurance agent in Washington (WAOIC #1365574). Insurer data checked against the state chart current as of October 8, 2026.
99328 is in Columbia County, where 15 insurers sell Medicare Supplement plans: 15 sell Plan G and 14 sell Plan N.
- County
- Columbia
- Closest community
- Dayton
- Medicare clinicians in 99328
- 49
- Nearest hospital
- 0 mi
CMS lists 49 Medicare clinicians practicing at addresses in 99328; 1 may not always accept Medicare assignment. Practices here include Columbia County Hospital District and Blue Mountain Counseling of Columbia County. Counting everything within 8 miles of the ZIP's center: 49 clinicians, 2.0% sometimes declining assignment (statewide 4.5%). Nearest general hospital: Dayton General Hospital in Dayton, under 1 mile. Nearest Medicare-certified nursing home: Washington State Walla Walla Veterans Home, about 26 miles (5 of 5 stars).
1,356 people on Medicare in Columbia County77% in Original Medicare (WA 50%)13% of those 65+ are 85 or older
Medigap plans sold in 99328
| Plan | Insurers | Who |
|---|---|---|
| Plan G | 15 | Bankers Reserve Life, First Health Life & Health, GPM Health & Life, HumanaDental, Insurance Company of North America, Medco Containment Life and more |
| Plan N | 14 | Bankers Reserve Life, First Health Life & Health, GPM Health & Life, HumanaDental, Insurance Company of North America, Medco Containment Life and more |
| High-deductible Plan G | 6 | HumanaDental, Insurance Company of North America, Premera, United American, United World Life (Mutual of Omaha), Washington National |
| Plan A | 14 | Bankers Reserve Life, First Health Life & Health, GPM Health & Life, HumanaDental, Insurance Company of North America, Medco Containment Life and more |
| Plan K | 2 | Regence BlueShield, UnitedHealthcare (AARP) |
| Plan F | 13 | Bankers Reserve Life, First Health Life & Health, GPM Health & Life, HumanaDental, Insurance Company of North America, Medco Containment Life and more |
| Specialty in 99328 | Clinicians |
|---|---|
| Mental health | 5 |
| Cardiology | 1 |
| Chiropractic | 1 |
Hospitals near 99328
| Hospital | Distance | Type | CMS overall rating |
|---|---|---|---|
| Dayton General Hospital Dayton | under 1 mi | Critical access | not rated |
| Garfield County Public Hospital District #1 Pomeroy | 17 mi | Critical access | not rated |
| Providence St. Mary Medical Center Walla Walla | 24 mi | Acute care | 3 of 5 stars |
Communities near 99328
Neighboring ZIP codes: 99361, 99329, 99347, 99359, 99362, 99402.
Common questions
Which insurers sell Medigap Plan G in 99328?
15 insurers sell Plan G to Columbia County residents (OIC chart current as of October 8, 2026).
How many Medigap insurers sell in 99328?
15, the Columbia County line-up.
Sources
- Washington OIC / SHIBA, 2026 Approved Medicare Supplement (Medigap) plans (rates current as of October 8, 2026)
- Washington OIC, Medigap (Medicare Supplement) plan coverage and costs
- CMS Doctors and Clinicians National Downloadable File (data.cms.gov dataset mj5m-pzi6), released Nov. 12, 2026
- CMS Hospital General Information (data.cms.gov dataset xubh-q36u)
- CMS Nursing Home Provider Information, October 2026 (data.cms.gov dataset 4pq5-n9py)
- U.S. Census Bureau 2024 Gazetteer files; 2024 population estimates (SUB-EST2024)
- U.S. Census Bureau 2024 ZCTA Gazetteer; 2020 ZCTA-to-county relationship file