Jim A. Buck, M.D.
Family Medicine Physician · Fairfield, IA
Jim A. Buck, M.D. is a family medicine physician with a practice address in Fairfield, Iowa, and NPI 1841308533, issued on Aug 25, 2006. Check the license (Iowa 23255, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Jim A. Buck
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 23255 IA
Self-reported in NPPES; status is on the state search - Practice location
- 2000 South Main Street, Fairfield, IA 52556
- Phone
- (641) 472-4141
- Enumerated
- Aug 25, 2006
- Record last updated
- Jul 22, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicaid ID
- 198564 IA
- Medicare enrollment
- Enrolled (PECOS I20100524000458); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 1979
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,336 in Iowa → Look up another NPI →
Also registered at 2000 South Main Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Howe, M.A., SLPSpeech-Language Pathologist1952684086
- David Larson, M.D.Family Medicine Physician1891803508
- Michael Poole, D.O.Family Medicine Physician1821105537
Verify Jim A. Buck in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 23255Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
33 Medicare Part D claims, 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.
Most prescribed
- Atenolol13 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): 64.1 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: $17.13
1 payment: food and beverage; the largest payer was Ferring Pharmaceuticals 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
- Jefferson County HospitalFairfield, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jim A. Buck among 2,336 family medicine physician records in Iowa
Jim A. Buck, M.D. is one of 2,336 family medicine physician records with a practice address in Iowa. 75% 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 16% of them.
- NPI issued2006 · 16% of these records are older, 48% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1979 · median 2006 among the 1,367 with a school on file
- Record last updated2009 · 61% 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 Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 family medicine physician records list a practice address in Fairfield
They are 12 of the 178 NPPES records with a practice address in Fairfield, and 2,336 family medicine physician records in Iowa.
All 2,336 in Iowa → Every provider in Fairfield → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Terry Cochran, M.D.Fairfield, IA 525561053326496
- Richard Curtis, M.D.Fairfield, IA 525561548619356
- Mary Gartin, ARNPFairfield, IA 525561568894731
- Michael Greiner, M.D.Fairfield, IA 525561124133640
- Joni Hanshaw, CRNPFairfield, IA 525561396083531
- Donal Hill, D.O.Fairfield, IA 525561265547053
- David Larson, M.D.Fairfield, IA 525561891803508
- Daniel Miller, DOFairfield, IA 525561447273743
Common questions
What is Jim A. Buck, M.D.'s NPI number?
Jim A. Buck, M.D.'s National Provider Identifier (NPI) is 1841308533, issued on Aug 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jim A. Buck, M.D. located?
The NPPES record lists a practice address at 2000 South Main Street, Fairfield, IA, 52556. Phone: (641) 472-4141. Providers update this record themselves, so call before visiting.
How can I verify Jim A. Buck, M.D.'s license?
NPPES lists Iowa license number 23255, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jim A. Buck, M.D. prescribe under Medicare Part D?
In 2024, Jim A. Buck, M.D. had 33 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Jim A. Buck, M.D.'s MIPS final score?
The 2023 MIPS final score is 64.1 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.