Nancy K. Lonsdorf, M.D.
General Practice Physician · Fairfield, IA
Nancy K. Lonsdorf, M.D. is a general practice physician with a practice address in Fairfield, Iowa, and NPI 1689792939, issued on Mar 26, 2007. Check the license (Iowa 25776, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Nancy K. Lonsdorf
- Credential
- M.D.
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 25776 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1100 N 4TH St Ste 211, Fairfield, IA 52556
- Phone
- (641) 469-3174
- Enumerated
- Mar 26, 2007
- Record last updated
- Dec 30, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (877) 603-3125
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 38 in Iowa → Look up another NPI →
Verify Nancy K. Lonsdorf in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 25776Check 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 general practice physician in 2024
44 Medicare Part D claims, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D.
Most prescribed
- Progesterone13 claims
- Rosuvastatin Calcium13 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.
Nancy K. Lonsdorf among 38 general practice physician records in Iowa
Nancy K. Lonsdorf, M.D. is one of 38 general practice physician records with a practice address in Iowa. 39% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 42% of them.
- NPI issued2007 · 42% of these records are older, 39% newer
- In a Medicare fileYes · 39% of these records are
- In the CMS Doctors and Clinicians fileNo · 21% of these records are
- Record last updated2019 · 84% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 general practice physician records list a practice address in Fairfield
They are 2 of the 178 NPPES records with a practice address in Fairfield, and 38 general practice physician records in Iowa.
All 38 in Iowa → Every provider in Fairfield → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Joel Silver, MDFairfield, IA 525561447638960
- Lindsey Van Duyn, D.O.Sigourney, IA 525911871975185
- Joshuan Hicks, D.O.Ottumwa, IA 525011326488800
- Kathy Anderson, M.D.Fort Madison, IA 526271285636100
- Jennifer Lopez, ARNPCedar Rapids, IA 524011396425047
- Maurice Huffman, M.D.Bettendorf, IA 527221316932429
- Betty Hibler, MDClinton, IA 527321235118837
- Curtis Frier, DOWashington, IA 523531902899586
Common questions
What is Nancy K. Lonsdorf, M.D.'s NPI number?
Nancy K. Lonsdorf, M.D.'s National Provider Identifier (NPI) is 1689792939, issued on Mar 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nancy K. Lonsdorf, M.D. located?
The NPPES record lists a practice address at 1100 N 4TH St Ste 211, Fairfield, IA, 52556. Phone: (641) 469-3174. Providers update this record themselves, so call before visiting.
How can I verify Nancy K. Lonsdorf, M.D.'s license?
NPPES lists Iowa license number 25776, 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 Nancy K. Lonsdorf, M.D. prescribe under Medicare Part D?
In 2024, Nancy K. Lonsdorf, M.D. had 44 Medicare Part D claims; the average among general practice physician prescribers was 3,030. 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.