Gregory K. Harter, MD
Family Medicine Physician · Waterloo, IA
Gregory K. Harter, MD is a family medicine physician with a practice address in Waterloo, Iowa, and NPI 1134157415, issued on Jun 28, 2006. Check the license (Iowa 26144, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Gregory K. Harter
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 26144 IA
Self-reported in NPPES; status is on the state search - Practice location
- 125 E Tower Park Dr, Waterloo, IA 50701
- Phone
- (319) 232-0555
- Enumerated
- Jun 28, 2006
- Record last updated
- Feb 4, 2022
- Medicaid ID
- 0038414 IA
- Medicare enrollment
- Enrolled (PECOS I20100519000711); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 1986
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,336 in Iowa → Look up another NPI →
Also registered at 125 E Tower Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allison Hancock, PTA, ATC, LATAthletic Trainer1598645574
- Daniel Howlett, ARNP, DNPNurse Practitioner1326488420
- Michaela Johnson, ARNPFamily Nurse Practitioner1407312549
- M PalmaPhysical Therapist1992758916
- Suresh Reddy, MDGastroenterology Physician1053358226
- Stefanie Swinton, DPTPhysical Therapist1538424874
Verify Gregory K. Harter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 26144Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average family medicine physician in 2024
10,806 Medicare Part D claims for 549 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 227 claims were for opioids.
Most prescribed
- Lisinopril469 claims
- Levothyroxine Sodium466 claims
- Atorvastatin Calcium447 claims
- Amlodipine Besylate398 claims
- Rosuvastatin Calcium366 claims
- Omeprazole353 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.
Industry payments in 2024: $2,319.97
137 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer 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
- Cedar Valley Medical Specialists PCWaterloo, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory K. Harter among 2,336 family medicine physician records in Iowa
Gregory K. Harter, MD 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
- Graduated1986 · median 2006 among the 1,367 with a school on file
- Record last updated2022 · 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).
93 family medicine physician records list a practice address in Waterloo
They are 93 of the 1,512 NPPES records with a practice address in Waterloo, and 2,336 family medicine physician records in Iowa.
All 2,336 in Iowa → Every provider in Waterloo → Family Medicine Physician nationwide →
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- Santhi Keeran, MDWaterloo, IA 507011851515688
- Matthew Kettman, MDWaterloo, IA 507011245218882
- Jayalakshmi Murugaian, MDWaterloo, IA 507011215915483
- James Poock, MDWaterloo, IA 507011740260074
- Ellen Sakornbut, MDWaterloo, IA 507011578567947
Common questions
What is Gregory K. Harter, MD's NPI number?
Gregory K. Harter, MD's National Provider Identifier (NPI) is 1134157415, issued on Jun 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory K. Harter, MD located?
The NPPES record lists a practice address at 125 E Tower Park Dr, Waterloo, IA, 50701. Phone: (319) 232-0555. Providers update this record themselves, so call before visiting.
How can I verify Gregory K. Harter, MD's license?
NPPES lists Iowa license number 26144, 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 Gregory K. Harter, MD prescribe under Medicare Part D?
In 2024, Gregory K. Harter, MD had 10,806 Medicare Part D claims for 549 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.