Steven J. Koga, M.D.
Internal Medicine Physician · Caldwell, ID
Steven J. Koga, M.D. is an internal medicine physician with a practice address in Caldwell, Idaho, and NPI 1144275512, issued on May 24, 2006. Check the license (Idaho M6779, as entered in NPPES) on the Idaho Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Steven J. Koga
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- M6779 ID
Self-reported in NPPES; status is on the state search - Practice location
- 1906 Fairview Ave Ste 230, Caldwell, ID 83605
- Phone
- (208) 459-4667
- Enumerated
- May 24, 2006
- Record last updated
- Jan 28, 2022
- Fax
- (208) 459-3372
- Medicaid ID
- 002349300 ID
- Medicare enrollment
- Enrolled (PECOS I20040721001720); accepts Medicare assignment
- Medical or professional school
- University Of Texas Southwestern Medical School At Dallas, 1991
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 453 in Idaho → Look up another NPI →
Also registered at 1906 Fairview Ave Ste 230
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lyndon Box, MDInterventional Cardiology Physician1174620512
- Hannah Cliff, PA-CPhysician Assistant1336952662
- Linnae Frisby, NPFamily Nurse Practitioner1780303966
- Christina Jones, DNP-FNPFamily Nurse Practitioner1699529107
- Joe Llenos, MDFamily Medicine Physician1003073560
- Alyssa Nitschelm, RNFamily Nurse Practitioner1942044516
Verify Steven J. Koga in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIdaho Board of Medicine
Search for license M6779Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average internal medicine physician in 2024
10,988 Medicare Part D claims for 669 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 113 claims were for opioids.
Most prescribed
- Levothyroxine Sodium718 claims
- Losartan Potassium438 claims
- Atorvastatin Calcium418 claims
- Lisinopril393 claims
- Gabapentin342 claims
- Amlodipine Besylate341 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.
Bills Medicare through one group practice
- West Valley Medical Group LLCCaldwell, ID
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven J. Koga among 453 internal medicine physician records in Idaho
Steven J. Koga, M.D. is one of 453 internal medicine physician records with a practice address in Idaho. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 63% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated1991 · median 2011 among the 254 with a school on file
- Record last updated2022 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Idaho practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 internal medicine physician records list a practice address in Caldwell
They are 9 of the 736 NPPES records with a practice address in Caldwell, and 453 internal medicine physician records in Idaho.
All 453 in Idaho → Every provider in Caldwell → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Harsh Vardhan Agrawal, MDCaldwell, ID 836051760663900
- Sherri Brown, MDCaldwell, ID 836051235172644
- Hugh Eddy, M.D.Caldwell, ID 836051295988384
- Nathanael Hogg, D.OCaldwell, ID 836051225420250
- Nathan Holmes, DOCaldwell, ID 836051396151148
- Carolyn Rees, M.D.Caldwell, ID 836051386683431
- Dennis Wattier, RNCaldwell, ID 836051699464776
- Forrest Yeakley, DOCaldwell, ID 836051841787611
Common questions
What is Steven J. Koga, M.D.'s NPI number?
Steven J. Koga, M.D.'s National Provider Identifier (NPI) is 1144275512, issued on May 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Steven J. Koga, M.D. located?
The NPPES record lists a practice address at 1906 Fairview Ave Ste 230, Caldwell, ID, 83605. Phone: (208) 459-4667. Providers update this record themselves, so call before visiting.
How can I verify Steven J. Koga, M.D.'s license?
NPPES lists Idaho license number M6779, as entered by the provider. Search the Idaho Board of Medicine at https://dopl.idaho.gov/bom/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Steven J. Koga, M.D. prescribe under Medicare Part D?
In 2024, Steven J. Koga, M.D. had 10,988 Medicare Part D claims for 669 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.