Quick answers
- Does Mariko W. Harper accept Medicare assignment?
- Yes. Medicare's clinician data says Mariko W. Harper 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 Mariko W. Harper see?
- In 2024, CMS data shows 1,385 Original Medicare patients and 3,662 services for Mariko W. Harper. This counts Original Medicare only and measures volume, not quality.
- What is Mariko W. Harper's NPI number?
- 1336448513. 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 Mariko W. Harper, 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 | 1,385 |
|---|---|
| Services billed to Medicare | 3,662 |
| Different services or procedures | 66 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)523 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)444 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)357 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)249 services
- Ultrasound of heart with color-depicted blood flow, rate and valve function (93325)248 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 blood pressure75%
- High cholesterol75%
- Arthritis45%
- Atrial fibrillation44%
- Ischemic heart disease43%
- Heart failure41%
Hospitals where Mariko W. Harper works
Medicare's Facility Affiliation Data lists Mariko W. Harper 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.
- Bartlett Regional HospitalJuneau, AK · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 020008
- Highline Medical CenterBurien, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 500011
- St Michael Medical CenterSilverdale, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 500039
- Virginia Mason Medical CenterSeattle, WA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 500005
- Whidbeyhealth Medical CenterCoupeville, WA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 501339
Practice locations
Addresses where Mariko W. Harper is enrolled with Medicare (CMS data updated October 2, 2026).
- 1100 9th AveSeattle, WA 98101 (206) 223‑6600
Group practices
Medicare enrollment lists Mariko W. Harper as a member of this group (CMS data updated October 2, 2026).
- Virginia Mason Medical Center867 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Washington →
Other cardiologists in Seattle
Clinicians with the same Medicare primary specialty in Seattle, WA — not a recommendation.
Other clinicians in Virginia Mason Medical Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1336448513 |
| 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