Steven Kiyoshi Yamazaki, M.D.
Family Medicine Physician · Castle Rock, CO
Steven Kiyoshi Yamazaki, M.D. is a family medicine physician with a practice address in Castle Rock, Colorado, and NPI 1861757890, issued on Jul 5, 2012. Check the license (Colorado DR.0056881, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Steven Kiyoshi Yamazaki
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- DR.0056881 CO
66919 GA
Self-reported in NPPES; status is on the state search - Practice location
- 831 S Perry St, Castle Rock, CO 80104
- Phone
- (303) 218-7774
- Enumerated
- Jul 5, 2012
- Record last updated
- Oct 3, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicaid ID
- 59317515 CO
- Medicare enrollment
- Enrolled (PECOS I20160720000232); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Also registered at 831 S Perry St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rebecca BernacheProfessional Counselor1417580267
- Daniel Boyll, BCBABehavior Analyst1528936846
- Desiree BurkProfessional Counselor1376058859
- Paige CampbellBehavior Technician1437072238
- Logan CarpenterBehavior Technician1326961566
- Skye Embrey, LPCProfessional Counselor1528162708
Verify Steven Kiyoshi Yamazaki in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0056881Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
62 Medicare Part D claims for 53 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 25 claims were for opioids.
Most prescribed
- Diclofenac Sodium36 claims
- Hydrocodone-Acetaminophen16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 77.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $4,200.00
1 payment: consulting fee; the largest payer was Trice Medical, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Portercare Adventist Health SystemCastle Rock, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven Kiyoshi Yamazaki among 3,563 family medicine physician records in Colorado
Steven Kiyoshi Yamazaki, M.D. is one of 3,563 family medicine physician records with a practice address in Colorado. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 69% of them.
- NPI issued2012 · 69% of these records are older, 28% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2008 · median 2008 among the 2,077 with a school on file
- Record last updated2017 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
45 family medicine physician records list a practice address in Castle Rock
They are 45 of the 1,319 NPPES records with a practice address in Castle Rock, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Castle Rock → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- John Campbell, M.D.Castle Rock, CO 801041053373415
- Christopher Carpenter, M.D.Castle Rock, CO 801041508846023
- Ann Engel, M.D.Castle Rock, CO 801041285743385
- Jack England, D.O.Castle Rock, CO 801041609856749
- Deborah Fromm, MDCastle Rock, CO 801041467492090
- Belton Hallmark, M.D.Castle Rock, CO 801041225018633
- Louis Kasunic, D.O.Castle Rock, CO 801041912083296
- Doris Kleinert, M.D.Castle Rock, CO 801041861474751
Common questions
What is Steven Kiyoshi Yamazaki, M.D.'s NPI number?
Steven Kiyoshi Yamazaki, M.D.'s National Provider Identifier (NPI) is 1861757890, issued on Jul 5, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Steven Kiyoshi Yamazaki, M.D. located?
The NPPES record lists a practice address at 831 S Perry St, Castle Rock, CO, 80104. Phone: (303) 218-7774. Providers update this record themselves, so call before visiting.
How can I verify Steven Kiyoshi Yamazaki, M.D.'s license?
NPPES lists Colorado license number DR.0056881, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Steven Kiyoshi Yamazaki, M.D. prescribe under Medicare Part D?
In 2024, Steven Kiyoshi Yamazaki, M.D. had 62 Medicare Part D claims for 53 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Steven Kiyoshi Yamazaki, M.D.'s MIPS final score?
The 2023 MIPS final score is 77.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.