James S. Irwin, M.D.
Family Medicine Physician · Jerome, ID
James S. Irwin, M.D. is a family medicine physician with a practice address in Jerome, Idaho, and NPI 1023007465, issued on Oct 18, 2005. Check the license (Idaho M-4359, as entered in NPPES) on the Idaho Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- James S. Irwin
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- M-4359 ID
Self-reported in NPPES; status is on the state search - Practice location
- 132 5TH Ave W, Jerome, ID 83338
- Phone
- (208) 814-9800
- Enumerated
- Oct 18, 2005
- Record last updated
- Jan 6, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (208) 814-9833
- Medicare enrollment
- Enrolled (PECOS I20100420000975); accepts Medicare assignment
- Medical or professional school
- University Of Utah School Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,316 in Idaho → Look up another NPI →
Also registered at 132 5TH Ave W
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rachel Bordewyk, MS, LPCCounselor1417782921
- Joshua Hansen, D.O.Family Medicine Physician1730542143
- Joshua Kern, M.D.Family Medicine Physician1366486003
- James Lohmann, M.D.Family Medicine Physician1720077175
- Melissa Merrill, CNM, WHNPWomen's Health Nurse Practitioner1043459696
- Justin Smith, MDFamily Medicine Physician1851612600
Verify James S. Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIdaho Board of Medicine
Search for license M-4359Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average family medicine physician in 2024
4,405 Medicare Part D claims for 342 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 105 claims were for opioids.
Most prescribed
- Atorvastatin Calcium240 claims
- Telmisartan186 claims
- Amlodipine Besylate176 claims
- Ramipril168 claims
- Levothyroxine Sodium167 claims
- Omeprazole143 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): 78.9 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).
Bills Medicare through one group practice
- St Lukes Clinic LLCJerome, ID
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James S. Irwin among 1,316 family medicine physician records in Idaho
James S. Irwin, M.D. is one of 1,316 family medicine physician records with a practice address in Idaho. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1980 · median 2009 among the 793 with a school on file
- Record last updated2015 · 49% 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 Idaho practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
23 family medicine physician records list a practice address in Jerome
They are 23 of the 137 NPPES records with a practice address in Jerome, and 1,316 family medicine physician records in Idaho.
All 1,316 in Idaho → Every provider in Jerome → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Logan Anderson, DOJerome, ID 833381356916209
- Jameson Bastow, DOJerome, ID 833381639791361
- Clarence Brunson, MDJerome, ID 833381851556229
- Matthew Duersch, M.D.Jerome, ID 833381902941750
- Anna Fox, MDJerome, ID 833381023514163
- Joshua Hansen, D.O.Jerome, ID 833381730542143
- Brian Johnson, M.D.Jerome, ID 833381336138783
- Elizabeth Johnson, M.D.Jerome, ID 833381891784245
Common questions
What is James S. Irwin, M.D.'s NPI number?
James S. Irwin, M.D.'s National Provider Identifier (NPI) is 1023007465, issued on Oct 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James S. Irwin, M.D. located?
The NPPES record lists a practice address at 132 5TH Ave W, Jerome, ID, 83338. Phone: (208) 814-9800. Providers update this record themselves, so call before visiting.
How can I verify James S. Irwin, M.D.'s license?
NPPES lists Idaho license number M-4359, 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 James S. Irwin, M.D. prescribe under Medicare Part D?
In 2024, James S. Irwin, M.D. had 4,405 Medicare Part D claims for 342 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is James S. Irwin, M.D.'s MIPS final score?
The 2023 MIPS final score is 78.9 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.