Rachel M. Koster, PA-C
Physician Assistant · Chubbuck, ID
Rachel M. Koster, PA-C is a physician assistant with a practice address in Chubbuck, Idaho, and NPI 1437469830, issued on Oct 19, 2010. Check the license (Idaho PA-867, as entered in NPPES) with the Idaho board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Rachel M. Koster
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA-867 ID
Self-reported in NPPES; status is on the state search - Practice location
- 4650 Hawthorne Road,, Chubbuck, ID 83202
- Phone
- (208) 237-9833
- Enumerated
- Oct 19, 2010
- Record last updated
- Oct 23, 2017 (not updated in 9 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 1,250 in Idaho → Look up another NPI →
Verify Rachel M. Koster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Idaho board licenses this profession
Search for license PA-867Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8.1 times the Medicare Part D claims of the average physician assistant in 2024
6,682 Medicare Part D claims for 537 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 54 claims were for opioids.
Most prescribed
- Levothyroxine Sodium421 claims
- Atorvastatin Calcium310 claims
- Amlodipine Besylate209 claims
- Rosuvastatin Calcium204 claims
- Metformin Hcl170 claims
- Losartan Potassium160 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): 72.4 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: $492.39
22 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 64,719 providers of this specialty with any payment received $841.65 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.
Rachel M. Koster among 1,250 physician assistant records in Idaho
Rachel M. Koster, PA-C is one of 1,250 physician assistant records with a practice address in Idaho. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 27% of them.
- NPI issued2010 · 27% of these records are older, 70% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileNo · 77% of these records are
- Record last updated2017 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Idaho practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 physician assistant records list a practice address in Chubbuck
They are 9 of the 264 NPPES records with a practice address in Chubbuck, and 1,250 physician assistant records in Idaho.
All 1,250 in Idaho → Every provider in Chubbuck → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Leslie Burnside, PA-CChubbuck, ID 832021760451454
- Michaela Butler, PA-SChubbuck, ID 832021457927204
- Kyrra DoshierPocatello, ID 832021578306866
- Renee Katter, PA-CChubbuck, ID 832021053502955
- Brent LeavittChubbuck, ID 832021740650548
- Ryan McCulloch, PAChubbuck, ID 832021720195530
- Amy McKinlay, PA-CChubbuck, ID 832021992716674
- Wiley Petersen, PA-CChubbuck, ID 832021568920080
Common questions
What is Rachel M. Koster, PA-C's NPI number?
Rachel M. Koster, PA-C's National Provider Identifier (NPI) is 1437469830, issued on Oct 19, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Rachel M. Koster, PA-C located?
The NPPES record lists a practice address at 4650 Hawthorne Road,, Chubbuck, ID, 83202. Phone: (208) 237-9833. Providers update this record themselves, so call before visiting.
How can I verify Rachel M. Koster, PA-C's license?
NPPES lists Idaho license number PA-867, as entered by the provider. Search the Idaho board that licenses this profession; the NPPES record confirms identity only.
How much does Rachel M. Koster, PA-C prescribe under Medicare Part D?
In 2024, Rachel M. Koster, PA-C had 6,682 Medicare Part D claims for 537 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Rachel M. Koster, PA-C's MIPS final score?
The 2023 MIPS final score is 72.4 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.