Steven Yamazaki, M.D.
NPI 1861757890 · Family Medicine Physician · Castle Rock, CO
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Yamazaki, M.D. is a Family Medicine Physician provider in Castle Rock, CO (NPI 1861757890).
Provider details
- NPI number
- 1861757890
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 66919 (GA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
671 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 293 | $129 |
| Aspiration And/Or Injection of Fluid Large Joint Using Ultrasound Guidance20611 | 171 | $124 |
| Limited Ultrasound Scan of Joint Or Other Extremity Structure Except Blood Vessels76882 | 149 | $64 |
| Ultrasonic Guidance for Needle Placement76942 | 22 | $29 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 20 | $168 |
| Injection Into Tendon Or Ligament20550 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Diclofenac Sodium | 36 | 33 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 16 | 16 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,200 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-07-05
- Last updated
- 2017-10-03
Frequently asked questions
- What is Steven Yamazaki's NPI number?
- Steven Yamazaki's National Provider Identifier (NPI) is 1861757890, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Yamazaki's specialty?
- Steven Yamazaki is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Yamazaki located?
- Steven Yamazaki's practice location on file with NPPES is 831 S Perry St, Castle Rock, CO 80104-1919.
- What is Steven Yamazaki's phone number?
- The practice phone number listed in the NPPES registry for Steven Yamazaki is (303) 218-7774.
- Does Steven Yamazaki accept Medicare?
- Steven Yamazaki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Yamazaki's NPI active?
- Yes — Steven Yamazaki's NPI (1861757890) is active in the NPPES registry as of the last update on 2017-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.