Steven Hayashi, MD
NPI 1285744318 · Internal Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Hayashi, MD is a Internal Medicine Physician provider in Seattle, WA (NPI 1285744318).
Provider details
- NPI number
- 1285744318
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD00033104 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
982 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 308 | $102 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 215 | $142 |
| 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'SG2211 | 134 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 83 | $70 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 44 | $141 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 100 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 569 | 164 |
| Losartan Potassium | 277 | 82 |
| Amlodipine Besylate | 266 | 66 |
| Simvastatin | 220 | 60 |
| Omeprazole | 218 | 76 |
| Tamsulosin Hcl | 172 | 51 |
| Metformin Hclbrand: Metformin Hcl Er |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-30
- Last updated
- 2008-06-16
Frequently asked questions
- What is Steven Hayashi's NPI number?
- Steven Hayashi's National Provider Identifier (NPI) is 1285744318, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Hayashi's specialty?
- Steven Hayashi is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Hayashi located?
- Steven Hayashi's practice location on file with NPPES is 1100 9th Ave, Seattle, WA 98101-2756.
- What is Steven Hayashi's phone number?
- The practice phone number listed in the NPPES registry for Steven Hayashi is (206) 223-6600.
- Does Steven Hayashi accept Medicare?
- Steven Hayashi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Hayashi's NPI active?
- Yes — Steven Hayashi's NPI (1285744318) is active in the NPPES registry as of the last update on 2008-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.