Rachel Maassen, MD
Obstetrics & Gynecology Physician · Iowa City, IA
Rachel Maassen, MD is an obstetrics & gynecology physician with a practice address in Iowa City, Iowa, and NPI 1770535593, issued on May 17, 2006. Check the license (Iowa 36538, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Rachel Maassen
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 36538 IA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Hawkins Dr, Iowa City, IA 52242
- Phone
- (319) 356-1616
- Enumerated
- May 17, 2006
- Record last updated
- Mar 12, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (319) 384-2348
- Medicaid IDs
- 1495739 IA
0495739 IA - Medicare enrollment
- Enrolled (PECOS I20060831000072); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 339 in Iowa → Look up another NPI →
Also registered at 200 Hawkins Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Rachel Maassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 36538Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
42 Medicare Part D claims for 14 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Medroxyprogesterone Acetate11 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
- State University OF IowaCoralville, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rachel Maassen among 339 obstetrics & gynecology physician records in Iowa
Rachel Maassen, MD is one of 339 obstetrics & gynecology physician records with a practice address in Iowa. 71% 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 25% of them.
- NPI issued2006 · 25% of these records are older, 49% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2002 · median 2006 among the 188 with a school on file
- Record last updated2008 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Iowa
There are 339 obstetrics & gynecology physician records in Iowa.
All 339 in Iowa → Every provider in Iowa City → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Barrie Anderson, MDIowa City, IA 522421003803867
- Noelle Bowdler, MDIowa City, IA 522421396732160
- Joseph Ehle, MDIowa City, IA 522421457337453
- Marygrace Elson, MDIowa City, IA 522421932193133
- Jane Engeldinger, MDIowa City, IA 522421932193125
- Thomas Gellhaus, MDIowa City, IA 522421518931062
- Paul Heimbecker, MDIowa City, IA 522421396719266
- Veronika Kolder, MDIowa City, IA 522421427047547
Common questions
What is Rachel Maassen, MD's NPI number?
Rachel Maassen, MD's National Provider Identifier (NPI) is 1770535593, issued on May 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rachel Maassen, MD located?
The NPPES record lists a practice address at 200 Hawkins Dr, Iowa City, IA, 52242. Phone: (319) 356-1616. Providers update this record themselves, so call before visiting.
How can I verify Rachel Maassen, MD's license?
NPPES lists Iowa license number 36538, 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 Rachel Maassen, MD prescribe under Medicare Part D?
In 2024, Rachel Maassen, MD had 42 Medicare Part D claims for 14 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.