John A. Baker, M.D.
Internal Medicine Physician · Twin Falls, ID
John A. Baker, M.D. is an internal medicine physician with a practice address in Twin Falls, Idaho, and NPI 1124061262, issued on Jun 14, 2006. Check the license (Idaho M8866, as entered in NPPES) on the Idaho Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- John A. Baker
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- M8866 ID
Self-reported in NPPES; status is on the state search - Practice location
- 775 Pole Line RD W, Twin Falls, ID 83301
- Phone
- (208) 814-8600
- Enumerated
- Jun 14, 2006
- Record last updated
- Dec 4, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (208) 814-8942
- Medicaid ID
- 806703100 ID
- Medicare enrollment
- Enrolled (PECOS I20031209000507); accepts Medicare assignment
- Medical or professional school
- University Of South Florida College Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 453 in Idaho → Look up another NPI →
Also registered at 775 Pole Line RD W
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marci AhlquistFamily Nurse Practitioner1376084673
- Julie Akins, FNPPsychiatric/Mental Health Nurse Practitioner1285811505
- Kovic Bailey, DOFamily Medicine Physician1194467688
- Gregory Ball, DOPulmonary Disease Physician1407985278
- Gretchen Basen, PA-CPhysician Assistant1861549396
- Cory Bates, M.D.Urology Physician1629256573
Verify John A. Baker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIdaho Board of Medicine
Search for license M8866Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.4 times the Medicare Part D claims of the average internal medicine physician in 2024
13,876 Medicare Part D claims for 785 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 377 claims were for opioids.
Most prescribed
- Levothyroxine Sodium887 claims
- Omeprazole572 claims
- Atorvastatin Calcium545 claims
- Amlodipine Besylate481 claims
- Lisinopril468 claims
- Rosuvastatin Calcium314 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
- St Lukes Clinic LLCTwin Falls, ID
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John A. Baker among 453 internal medicine physician records in Idaho
John A. Baker, 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
- Graduated1980 · median 2011 among the 254 with a school on file
- Record last updated2014 · 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).
19 internal medicine physician records list a practice address in Twin Falls
They are 19 of the 1,660 NPPES records with a practice address in Twin Falls, and 453 internal medicine physician records in Idaho.
All 453 in Idaho → Every provider in Twin Falls → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Patrick Desmond, M.D.Twin Falls, ID 833011821038282
- Lucie Dimaggio, M.D.Twin Falls, ID 833011336188267
- Matthew Dopp, M.D.Twin Falls, ID 833011255575619
- Warren Dopson, M.D.Twin Falls, ID 833011265472781
- Daryl Ficklin, DOTwin Falls, ID 833011346213303
- Brian Fortuin, M.D.Twin Falls, ID 833011740221191
- John Gibney, M.D.Twin Falls, ID 833011477710838
- Jared Helms, DOTwin Falls, ID 833011407035371
Common questions
What is John A. Baker, M.D.'s NPI number?
John A. Baker, M.D.'s National Provider Identifier (NPI) is 1124061262, issued on Jun 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John A. Baker, M.D. located?
The NPPES record lists a practice address at 775 Pole Line RD W, Twin Falls, ID, 83301. Phone: (208) 814-8600. Providers update this record themselves, so call before visiting.
How can I verify John A. Baker, M.D.'s license?
NPPES lists Idaho license number M8866, 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 John A. Baker, M.D. prescribe under Medicare Part D?
In 2024, John A. Baker, M.D. had 13,876 Medicare Part D claims for 785 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.